I'm glad you have peace of mind :) What was the oil temp at those pressures, as those are some of the highest pressures I have seen. Also, was that 5W30 oil?
I bought the same kit at local Harbor Freight. And looked under microscope all adapters. BSP threads have a 55° angle and have rounded peaks and valleys (Whitworth thread form). So none of them is true BSP. Only one, I assume number 3, has rounded picks, but the valleys are flat, like in NTP. So I ordered online 1/8 NPT-BSP adapter and it came with correct shape, rounded peaks and valleys.
Didn't realize how easy it is to get an oil pressure reading, I got the Code P0021 and trying to check if it's at all related to the rear timing gasket, figured i might as well check my oil pressure but couldn't find a nice kit like the one you have.
Hey Doublea88, Sorry to hear about the P0021 code.... Here is a link to the a kit very similar to the one in the video: www.harborfreight.com/engine-oil-pressure-test-kit-62621.html
I think the hose was about 24" long, and I used a camera to watch/record it. You might be able to prop it up, or support it from the hood to hold it up, so you can see it from the driver's seat.
Any chance you’d know if the car would drive/perform differently with low oil pressure/failing gaskets? I bought a 2010 g37s and have almost put 3500 miles on it since and it starts and drives every time which makes me think that it’s fine. I also feel like logically, if the gaskets went bad or are going bad then the car would just not run or run really poorly. Any insight helps, I plan on having the oil pressure tested at a shop before the end of this year anyways.
Typically a P0011/P0021 (intake cam phasing problem) and maybe a P0524 (low oil pressure) will pop up. BUT, I don't know how much bearing wear/engine damage may happen before those codes pop up. Getting your oil pressure check is a good idea!
I have a 2019 370Z with about 67K miles on it and had an oil pressure check done on it. With 5W-30 Redline oil, the idle oil pressure was an excellent 30 psi but the oil pressure at 2,000 rpm was a disappointing 50 psi. I was wondering what might cause such a good oil pressure at idle to become somewhat lackluster at 2K rpm. I know the spec at 2k rpm is 42 psi so the engine isn't in danger of self-destructing. My assumption was that main bearing or big end connecting rod bearing wear would probably be the cause of lower oil pressure, but if that were the case then I would have expected the idle oil pressure to be low also. Maybe I'm missing something obvious.
30 psi at a hot idle (oil temp 80C/176F) is the highest I've ever heard of. Do you have an oil cooler and sandwich plate? If the pressure sensor is installed in the sandwich plate, it shows the oil pressure BEFORE the oil filter and this typically reads higher by an estimated 3-5 PSI. The factory oil pressure port is AFTER the oil filter, and shows the actual oil pressure inside the engine. As I see it, if you oil pressure is above factory spec, don't worry about it and just go for a nice drive, you won't hurt anything!
@MotorvateDIY Thank you very much for that reassuring information. I find all of your content on these Nissan engines most interesting and helpful. My oiling system is stock, except for an oversize oil filter that is meant for the 5.6 liter VK engine. The filter is identical, except that it is about 50% taller than the short one recommended for my VQ37 engine. My reason for using it was to try to compensate for the higher flow resistance of the more restrictive Fram Ultra Synthetic/Endurance filters I use on the car. These filters are published to have better than 99% filtration efficiency for particles 20 microns in diameter and larger, hence my reason for using them, but the tradeoff is a higher pressure drop across them. BTW: I really like the analysis you did where you measured the effect of oil temperature and engine rpm on oil pressure in the VQ engine. I'm a retired physicist who really enjoys seeing your methods and practices in this work you do for us.
Keep in mind, the oil bypass valve in the oil filter typically opens at 14psi. So if the "more restrictive Fram Ultra Synthetic/Endurance filters" increase the pressure differential close to that value, you may not be filtering any oil, since the bypass valve opens. For me, I've always used the manufacture's oil filter. In the spring I'm going to be measuring the oil pressure before and after the oil filter... just to see what is is, at different oil temps and engine RPM. I'll also try a few different oil filters and see how they compare to the stock Nissan filter.
@@MotorvateDIY That is a great idea! Içll look forward to seeing it. I did find a site that built a setup to pump heated oil at pressure through engine oil filters, with pressure gauges before and after to calculate the pressure drop. From what I remember, these Fram filters were only slightly more restrictive than the stock filters but were significantly better in their filtration efficiency of particles ranging down to 20 microns. My thinking was that if there was about a .002" clearance in those bearings then the running clearance would be about .001", or 25 microns, with the journals spinning in a hydrodynamic state. I would be most concerned with particles in the 10 to 20 micron range that would be most likely to fit between the gap and get lodged in the soft metal of the bearing shell. Aside from the Mann filters that seemed to offer excellent filtration efficiency at these small particle sizes, the top of the line Fram filters also seemed to do an excellent job and at a good price with good availability. My rough calculation of the reduction in pressure drop across a filter that was 50% taller with a 50% greater surface area for filtration would be about ⅔ of the pressure drop for the smaller filter. I really would be interested in seeing what kind of pressure drops we are getting across these filters. One thing that I don't like with these oil coolers with their thermostatically-controlled sandwich plates and sharp bend oil lines is the possibility of further causing more of an oil pressure drop.
Great video and very helpful information. I own a 2011 G37 with 90k miles and very concerned about the oil galley gasket issues. I'm dreading having to do the teardown and work myself as it's a bit above my knowledge and experience.
Yes you can.... BUT keep in mind the indicated pressure will be a little higher, maybe 2-3 psi. With the sandwich plate, you are measuring oil pressure BEFORE the oil filter. When the gauge/sensor is connected to the factory position, you are measuring oil pressure AFTER the oil filter, and this is the same oil pressure that is used to lubricate the crankshaft, connecting rods and everything else.
Great video! After doing this, I decided on installing my own oil pressure gauge. I have an 1/8th 27 NPT oil pressure sensor as well as a sandwich plate with 1/8th 27 NPT threads for the sensors, however, the threads seem to lock-up less than half through. I don't know what I'm doing wrong. I don't want to have any oil leaks or destroy the threads. Am I just overthinking this?
If you can turn the NPT fitting by hand and get about 1/2 way on, I think that should be ok. Make sure to use a liquid thread sealer or Teflon tape (just don't tape over the end of the fitting, as the tape can tear off and get into the oil, potentially blocking an oil passage) Here is an excellent article on NPT fitting and how much to tighen them: www.pegasusautoracing.com/document.asp?DocID=TECH00097 Good luck!
i have an aftermarket glowshift oil pressure gauge the last couple days once my car is warm my gauge reads like 10-12 psi at idle , but whe im driving the oil press gauge reads fine i dont know why my oil press is too low at idle, i bought a cosworth high pressure oil pump it was installed in my 03 nissan 350z supercharged
Hey yoshi z33, When measuring oil pressure and comparing it to the spec in the manual, you need to know the oil temperature. Here are the factory oil pressure specs for your engine (VQ35DE) when the oil is at 80C or 176F: • Idle > 14 psi • 2,000 RPM > 43 • 6,000 RPM > 57 If you measured the oil pressure and the oil was hotter, your pressure readings would be a little less. To my surprise, it looks like your engine doesn't have a factory oil temperature sensor, so this will make it harder to know when your oil is at the proper temp. When you factor in oil pressure gauge accuracy (typically +/- 2% of full scale or about -2 to +2 PSI for a 100 PSI sensor) and I suspect your checked the oil temp at more than 80C / 176F which would give you a slightly lower pressure, I don't think you need to worry. 10-12 PSI at idle is fine, as the lubrication requirements are low at low RPM. After driving the car easy for 10-15 minutes, check your oil pressure at 2,000 RPM. My guess is it will be in spec :)
That is a really good question!! If the VVT solenoid is stuck on the "drain" position, the oil pressure will be a little (~5 psi ?) lower. However, the VVT solenoids are easy to check by applying 12v to them for a split second and see if they click.
My guage in the car was all over the place in my 04 350z with the engine at op temp the manual guage rest at 30 at idle i was told thats great oil pressure
No, they are different. The port on the engine is 1/8 BSP and you need to get an adapter to connect to your pressure gauge. When tightening the 1/8 BSP connector if you over tighten it will split the port on the engine and you will have an oil leak. The BSP port is tapered and typically you only need 1-2 turns after finger tight. Good luck!
Great video! Keep them coming!! I am interested in installing a permanent oil pressure gauge soon to monitor possible rear main timing cover seal failures that are pretty common. What made you want to record this video?
Hey Stephen, Thanks for the kind words! Why did I make this video? For the same reason you mentioned, the rear timing cover gasket issue. When this video was shot (Aug 2016) I still had 500 miles of factory warranty and wanted to know if I had the issue. As a side project I am going to be building an oil pressure gauge using a digital pressure sensor and an Arduino (inexpensive micro-controller) My plan is to have a very small digital display (10mm tall) in a easy to read spot or maybe part of the dash.
Awesome, interested in what you come up with. I was hoping to build a wireless gauge (definitely digital) that does a max PSI of 200. I found information that this needs to be installed somewhere after the oil filter as that's where the pressure drops. So apparently not the sandwich plate near the oil pan. Other thought is, someone was able to read this info with Torque and Infiniti EX addon I believe. Going to do some digging to see if I can find the thread. If so that might be my route to check on it once in a while.
Hey wasup , i have a q50S rwd 3.7 2015 model. It’s supercharged. My low oil pressure light comes on and then goes off then comes back 2 days later. I checked the oil its at H still on the dipstick. Fresh oil change using amsoil. No leaks. Engine runs great. No cel . No weird noises . I changed the sensor to a new oem oil pressure sensor. Think its faulty wiring?
If that single wire that is on the factory oil pressure switch touches ground, the red oil light will turn on. Check the wire from the switch to the IPDM/ER for any damage. On a different note, your Q50 must be a lot of fun to drive !!
@@MotorvateDIY yes definitely just tryna figure out this fuel pump issue maybe i need a bigger one im using 340 aem fuel pump. & it was the wiring for oil pressure light lol
Thanks a lot for the video, it has been really helpful! I have a 2008 G37 and I measure the oil pressure at idle (700 RPM) to be 10 PSI. At 2000 RPM, the oil pressure does not quite reach 40 PSI. I am doing some work on the front end of the car because I hit a deer. I already have to replace the front bumper and radiator. Would you recommend doing a galley gasket repair while I have access? I am trying to decide whether its worth it. The car runs great but has 165k miles. Also, when I did the oil pressure test, the car was on ramps so that I could get to the oil pan. Does that matter for running the test?
If your oil pressure is at 10 psi at idle, I suspect your galley gaskets are leaking. Having the front on ramps won't change the oil pressure. In the video, my car was also on just the front ramps. Generally the VQ engines are very durable and last a long time. My 95 Maxima had 246,000 miles on it when I sold it.. and it still ran great! If the rest of the car is in good condition, I do think it is worth it to replace the galley gaskets. For the cost of that, that should give you an additional 100,000+ miles. Good luck for what ever you decide :)
@@MotorvateDIY Great information! Yeah I like the car and it otherwise runs well. I think I will take the time to have the gaskets replaced. Is there a good reference you would recommend for doing that. Thanks again!
Hey Motervate, I'm looking into buying an 08 g37 with 88k miles on it.. I'm not sure if the owner will allow me to set up a guage on his car.. It's invasive.. Is there anything I can do to test the car, audibly or visually that's not so intrusive to test for this problem?
@motorvate DIY I know this is an old video but just a quickk question, i tested my hr g35 sedan last night and the pressure was awesome just like yours in the video but the fitting on the oil switch was leaking just a little bit of oil like maybe a drop every 3 seconds, will this throw off my reading at all? I was thinking it would maybe actually show a little lower of a reading because it was maybe loosing a tiny amount of pressure?? Wasnt that loose at all just curious!
It may be an old video, but as the VQs get older, this check needs to be done more than ever :) A few drips from the pressure gauge won't have any measurable change in the indicated oil pressure. You have nothing to worry about :)
@@MotorvateDIY awesome, now i dont have to worry about babying it and drive it the way it was intended :) thanks again for all the great information and responding !
Hey Anup Patil, Sorry to hear about that! If your oil pressure is below 14 psi at idle when the oil temp is 80C/175F I think the galley gasket is the most likely issue. :( What are your oil pressures?
Hey brother quick question, I couldn’t get a completely tight seal for some odd reason so I did it with the fitting dripping very slowly. Would that affect the oil pressure at all? I think I got fairly good readings with 46 psi at 2k rpm’s & 26 at idle.
You are fine... a slight drip won't make any measurable difference.... AND you don't risk cracking/splitting the oil port in the upper oil pan. 46 & 26 are good numbers :)
Is there any reason to not use a sandwich plate for an oil pressure gauge? i have seen a few threads where people broke the housing for the oem pressure switch on the upper oil pan. ive also seen threads with people snapping the oem pressure switch. I dont like the idea of adding a tee setup.
That is an excellent question!!! The sandwich plate will give a higher oil pressure than what is in the engine. This is because it is the sandwich oil pressure is BEFORE the oil filter. The engine oil pressure is AFTER the oil filter and this can be a difference of 3-5 PSI (as a guess, I don't have had data on this... YET) Bottom line, if you don't over tighten the oil pressure sensor, you won't split the aluminum. Most don't understand that it is a tapered fitting, so you can't go by feel. Look here: www.pegasusautoracing.com/document.asp?DocID=TECH00097 Generally for 1/8" NPT, after finger tight, you only tighten 1.5 to 3 turns. I start with 1.5 and then check for leaks. No leaks = done. slight leak means an addition 1/2 turn and check again.
@@MotorvateDIY Im reading a thread now where a guy broke the upper oil pan just removing the switch. the idea that it is so sensitive adding a tee with extra leverage seems like asking for trouble to me. 3-5 psi sounds negligible to me. am i missing something? btw, thank you for making this video, and thank you for sharing your thoughts on the subject with me.
(Sometimes comments hide from me and then pop up... like this one!) The only time the upper oil pan cracks is due to over-tightening. The threads are tapered, and if you tighten it too much, you force apart/split the port. As mentioned in the video, I only tighten it enough to prevent it from leaking and check it the next week -OR- go by the factory spec of 11 foot lbs. A good thread sealer liquid also helps. However, if you want to use a sandwich plate, go right ahead, since you know the reading will be a little higher than actual, your good. I do have a sandwich plate, and have wanted to do an oil pressure comparison between the plate and the engine port... Maybe I'll get to that this summer.
Hey Terry1212, Well... that is a tough question to answer! Overall, I don't think it is a common issue. I think the G37 forums tend to make us think it is more common than it is. However, for those it has happened to, it is an unexpected and costly expense. As part of the pre-purchase inspection, I would make sure the oil pressure is measured (> 14 psi at 80C) and decide from there. If you do purchase a G37, when the engine is cold, I would keep the RPM under 2500 for the first 20-30 minutes. Cold oil is VERY thick and the oil pump in the G37 is a high volume pump. On my car during a cold start, I have seen the oil pressure MORE than 120 PSI! I often wonder on the gaskets that have failed, how did the owner drive the car on a cold start? Anyways, the G37 is a wonderful car and generally has been VERY reliable and a lot of fun to drive.
@@MotorvateDIY interesting. I'll be more careful with mine on cold starts but unfortunately I've had the car since 2013 so the damage would be done if any at all.
@@behindthen0thing I have a 2019 370Z that has an oil temperature gauge. On a cold start, I let it idle until the coolant gets up to temp, which is pretty quick and takes a few minutes. I then drive away with my revs not exceeding 2K with only gentle acceleration until the oil temp gets up to 180⁰F, usually within 4 or 5 miles. My car has 67K miles and uses no oil, as indicated on the dipstick, during the 3K mile oil change interval and has a hot idle oil pressure of 30 psi with the Nissan recommended 5w-30 oil.
I have the same kit and when I go to install the correct fitting I only get about one thread in before it stops. When I pull out the fitting there are a few marks like something is preventing it from going in further and I don't want to push it any further because I may damaged something. What should I do?
Hey TireSlinger81, Good question.... but the answer is no. When Torque starts, it gets a list of engine sensors (actually called PIDs) from the engine control module (ECM) This car (or any other car I have seen) do not't have an oil pressure PID, it won't show up in Torque.
Hey man! My 350z is reading about 10-12 psi at stop lights when driving, I'm about do follow theses steps and check my oil pressure, what happens if it is low?
If you have an automatic transmission, it must be in park or neutral to get an accurate oil pressure reading. (the idle is a little lower when stopped in drive) As mentioned in the video, the spec for oil pressure on the DE/HR and VHR engines is more than 14 psi at a hot idle (600-700 RPM) and more than 43 psi at 2,000 RPM WITH the oil temp at 80C/176F. If the oil pressure is low, the crank/cam/connecting rod bearings will start to wear very quickly, resulting in a knocking sound. This kills the engine quickly. One "common" issue on the 2007-2008 350/G35 is the "galley gasket" blowing out. This created an internal oil leak, and reduces the oil pressure. As for your 350, I know the factory gauge is not easy to read when the pressure is below 30 psi and you can only guess at the pressure. Once you check it with a mechanical oil pressure gauge, my guess is that your oil pressure is OK. Even if it is 12ish psi, I would just keep an eye on it as I don't think that is low enough to cause damage. I think the 2,000 RPM pressure (> 43 psi) is more important, as the engine spends more time at or above that RPM. Good luck and feel free to up me on your results!
Question, do you know of a solution I can permanently hook up a oil pressure sensor and have it remote transmit so an app like torque can read it (maybe with a plugin or some sort?). I am guessing not. I need to do this though as my engine VQ35HR is prone to the oil galley gasket failure, and the only way to tell if it's starting to go it to monitor the oil pressure regularly.
Hey Ryan Vanderwerf, We have the same concern regarding the oil gallery gasket failure as it is the same on the VQ35 and VQ37 engines. I am not aware of any remote oil pressure sensors. However, as time permits, I have been working on an Arduino (inexpensive open source micro controller) based oil pressure and temperature gauge with a small LED display to keep track of my oil pressure and temperature. Down the road, if all goes well, it will be an episode.
Ryan Vander, This is one of those problems that happen to a few cars and everyone expects it to happen to theirs. Not to say it does not happen because it does. I would just keep an eye on your dipstick, and so long as you are not getting the oil light or sounds of death from the engine, you should be just fine. Do note that Nissan has a tiny oil filter and requires more frequent oil changes as the filter gets full pretty fast. This may affect your pressure if the filter's bypass is not working properly.
Hey motorvate DIY, my idle while warm usually flickers between 13-15 psi and even sometimes up to 17 psi when my oil temp is around 80C. Do you think my gasket is about to go?
Based on the data from my G37, if my car is good, so is yours. Idle is > 14 PSI At 80C/175F. Cold start of > 100 psi is normal. I think your galley gaskets are good :) Just keep an eye on the idle oil pressure :)
Hey motorvate, my car won't go past 4k rpms but goes through the gears just fine. The infiniti mechanic said that on my 2011 g37x the oil pressure sensor was broken and the oil temperature sensor was reading incorrectly and that those were the things causing me to be in like a "safe mode" does this make sense? Also curious what the torque spec is for the oil temperature sensor
At the very top of the video description is says: *** Tip: Don't over tighten the oil pressure switch, the factory shop manual specifies 11 foot pounds. *** An easier way is to only turn it 1.5 - 3 turns past finger tight. On my car 2 turns was perfect. Also don't forget to use a thread sealer. Source: www.pegasusautoracing.com/document.asp?DocID=TECH00097 From the factory, there is a 4K soft limiter when in park or neutral, so that is nothing to worry about. The oil pressure switch doesn't do anything but turn on a light in the dash when the oil pressure is 4 PSI or less. I removed mine a year ago to add my oil pressure gauge. - It isn't needed. If you do have low oil pressure, you will have cam phasing codes (ex P0011/P0021) way before the low oil pressure light turn on. Oil temperate IS critical to proper engine operation. If the engine computer thinks the oil temp is too high, it will reduce engine RPM... I think that is the single root of your problem.
@@MotorvateDIY This video does not work for the 2011 G37x - Do you have any recommendations? I cannot seem to get a wrench on the oil pressure switch it is extremely tight space and the positioning is on top of the oil pan not on the side. Please advise
As you noticed, since your car is AWD, the location of the oil pressure switch is different. Since my car is RWD, I can't offer any suggestions as I don't have any first hand experience. You could try getting a oil pressure switch socket and that may give you easier access to loosen it.
Hello, my coolent temperature never crosses 185 F, doesn't matter how long I let it idel and even after 45m to an hour drive. Or is this normal? You think my coolent sensor maybe have an issue!! By the way thanks as always for your detail videos, my oil pressure looks good :)
Hey Ifteker Jaigirder, The spec for the G35/G37 is for the thermostat to start opening at 80C / 177F and start to close at about 77C / 171F. You engine coolant temperature is VERY closely checked by the ECU (engine control unit). On a cold start up, it will compare the engine coolant temp to the air intake temperature. ALSO the ECU watches how much the temperature over time when the engine is warming up. Soooo.... If you don't have a check engine light, I suspect everything is good :) If you want to learn more about all of the engine sensors on the VQ engine, please have a look at my other channel: ruclips.net/video/CXDX-89_ArU/видео.html
@@MotorvateDIY thank you, feel lot better now. By the way I followed your oil pressure video and my pressure is good. I did manage to break sending pressure unit lol, but got a new one installed, it was a pain though, my structure on X is little different then S, bars and hoses are all cramped together, no space to move plyer or wranch. Took me a while but finally got it done. I even bought the same kit as yours from HF :) I am glad I found you on RUclips. You speech, detail step by step, video quality and editing is perfect, you should have a TV channel :) Oh! I am still waiting on upstream 02 sensors replacement video! Hopefully next summer?
Hey Ifteker Jaigirder, Sometimes I wish my G37 was all wheel drive, so the video would be relevant to more people, but I really prefer a manual transmission and proper (rear wheel :) drive. Thanks for your kind words on the production works. I really appreciate it! As for replacement of up stream O2, when I replace mine an episode will be made.
I just looked up the 2007-2008 HR engine oil pressure spec and it is the same. At 80C / 176F oil temp: more than 14 psi at idle and more than 43 psi at 2,000 rpm.
@@MotorvateDIY thank you for the reply, I really appreciate it. I’ll be picking up a 350z nismo next week! What are other things you suggest to keep an eye out for? The Nismo I’ll be picking up only has 6000 miles so not enough wear to be concerned about, but I still want to inspect it and take it to the Nissan dealership to get an inspection.
Hey TLE0622 IPL, YES!! That's why the episode was made :) I wanted to check my oil pressure before the warranty expired and so far so good. Tip: Don't over tighten the oil pressure switch, the factory shop manual specifies 11 foot pounds.
Hey TLE0622 IPL, I see your point.... but it doesn't happen to ALL VQ37 and the internet is good at making a small problem seem much larger that it really is. However, if you have the issue, then it is a big problem :) I have always wondered if high engine RPM on a cold engine is part of the problem. With the VQ37, the engine oil pressure on a cold start up is more than 100 PSI which may stress the older style galley gaskets.
Hey Chris Francelli, To minimize the excessive pressure on the galley gaskets, I keep the engine RPMs under about 2,500 for the first 15 min after starting a cold car, with outside temperature less than about 15C / 60F. The engine in the G37/370z has a high volume oil pump and oil pressure is much higher when the oil is cold. I don't have any proof of this making a difference, but the logic works for me. On a future episode, I will be showing how the oil pump works (it it more interesting than you think!) and will show the crazy volume it puts out.
Motorvate DIY Hi. I’m looking for a used G37 possible a 2011. If the oil pressure on it is normal, should I consider it? Does the oil pressure plummet instantly or does it fall gradually as the galley gasket becomes weaker and weaker?
Just got a engine for my car and it is installed now it was used with 79k miles and on idle oil pressure drops . When running , oil pressure is fine. Shoul I stop driving the car completely? Or what is my best bet
Hey Motorvate. So I had the galley gaskets go out on my g37s . I had them replaced but the oil pressure still reads low at 5 psi. Any advice on what it may be? Please help thank you.
Hey Juan Rendon, Sorry to hear about that! If the galley gaskets resulted in low oil pressure for a while, it can wear the crankshaft & connecting rod bearings, resulting is additional clearance between them. This can lower the oil pressure. How does the engine run now? Can you measure the oil pressure with a different gauge to rule out a bad gauge?
@@MotorvateDIY So I just spoke with the mechanic that is doing the job. Before he replaced the gallery gaskets the oil pressure was at 9 psi. and after he replaced them he placed a gauge to check the psi while test driving and that it read normal when driving but when he was stop at idle the psi would drop to 5 psi. I'm going to have him check the oil pressure relief valve next. Got any advice on anything else that it might be?
Hey Juan Rendon, No harm in checking the oil pressure relief valve, as old gasket material could be holding it partly open. As for other items to check, I can't think of anything.
@@juanrendon9662 I would also be curious as to possible oil pressure fluctuations at idle, as these might be indicative of worn crankshaft or con rod bearings that have developed excessive journal to bearing metal clearances.
I do plan on doing a test in the spring of the difference in VHR engine oil pressure between 5/30 and 5/40. Based on the slightly higher viscosity of the 5W40 I would expect slightly higher oil pressure. How much higher, I don't know.
I don't think it would hurt anything, but I don't have any first hand experience as the recommended oil is 5W30. You can always try it and see for yourself. I think a few guys that run turbos on their G37/370 do like to use a thicker oil like a 5/40.
@@MotorvateDIY I already tried 5w40 on my VQ35HR, but it’s a hit heavy on city driving.. Do you think synthetic 5W30 oil can protect our VQ engines even we use over 7k RPM?
I do think 5W30 does a good job protecting the motor at all RPMs, low and high. One thing you should keep in mind is that at high RPM, the oil pressure is also very high. On the VQ37VHR at 100C / 212F oil temp, the oil pressure is more than 100 psi. This ensures the lubrication requirements are met and probably exceeded.
@@MotorvateDIY mine’s oil pressure sensor unit is broken and i retapped the thread and put a new long nut there. While mine is already got replaced with enhanced gallery gasket and valve cover gaskets, may I know if I have to worry about low engine oil pressure?..
@@MotorvateDIY thank you for replying sir! Do you think our v36 g sedan’s factory oil pressure works well? I’m wondering if i should install oil pressure gauge along with oil filter sandwich adapter.. or can i just keep driving my car without worrying about the oil pressure sensor removed… Currently mine is v36 g35s under 80k miles and changing engine oils every 5months/3k miles…
The G35/G37 use an oil pressure switch. Based on bench testing, it turns on the low oil pressure light when the pressure is 4 psi or less. That is VERY low!! Typically you will have cam phasing codes (P0011/P0021) due to low oil pressure way before the low oil pressure light turns on. An oil pressure gauge is an excellent idea! It allows you to keep an eye on the actual oil pressure, which just may save your engine if something happens. A sandwich plate works well, but the oil pressure reading will be slightly higher (~1-5 psi) as you are sensing oil pressure BEFORE the oil filter. The factory oil port is connected AFTER the oil filter and it the same pressure as the main oil galleries. On my G37, I removed the factory oil pressure switch about 2 years ago, and replaced it with a 150 PSI pressure sensor. So, you have 2 good option! Any oil pressure gauge is better than no oil pressure gauge!
Hey Motorvate, Hope all is well with you. i have a question. I had my gallery gaskets done because I had low oil pressure. So i checked my readings now after the work was done and i now have 17psi at idle and 42psi at 2k rpm. Any advice?
Hey DevilG, Yes, I do have some advice - relax and go for a drive :) The spec is more than 14 psi at idle and more than 43 psi at 2,000 RPM with the engine oil at 80C / 176F. At idle you are good! At 2,000 RPM you are close enough :) Also, oil pressure gauge accuracy can vary from 1-3% or more of the full scale value. (1-3 psi for a 100psi gauge) With the gauge showing 42 psi, I don't think you have anything to worry about.
@@MotorvateDIY ah i checked again at 80'C since she was probably warmer when i got home. Shes 18 and 48 now. Ill drive her and see what happens over time. I guess after new metal gaskets i was hoping for numbers closer to yours lol Anyhow thanks for the quicky reply and advice . You are awesome man, cheers 🍺
Hey Motorvate, have you planned on installing a permanent oil pressure guage for your G? Was thinking of installing one myself, because I fear the dreaded code. Was gonna go for the non mechanical guage.
Hey Daniel P, My gosh... are you reading my mind? :) In the spirit of "doing it yourself" I am in the process of designing/building an inexpensive digital oil pressure gauge for a future episode. This will use a $25, stainless steel, 150 PSI digital pressure sensor, a $10 Arduino Uno clone, and a $10 small 128 x 32 pixel OLED display. When I write the software for it I plan to show the highest and lowest oil pressure and have it flash red when the oil pressure is below 14 PSI. (the factory minimum at idle) It will be a different kind of episode, but I think it will be helpful.
I just recently got those 2 codes also on my 2004 g35(215k miles). Car started making noise somewhere from the engine even though i havent heard it the past few days and is constantly about to stall or does stall every time i come to a stop. Replaced both VVT solenoids and actuators. Didnt fix anything. Next step is to check oil pressure once my gauge gets here and then im going to check the timing tensioner and chain to see if anythings wrong there. If all looks good at that point im not sure what im going to do unless my code reader(bluedriver) just completely threw me in the wrong direction.
Hey Caleb Pinell, I sue can... How about a step by step video :) Oil Temp Gauge w/Torque Pro - Motorvate’s DIY Garage Quick Tip #2 ruclips.net/video/8oc7szSr-Xk/видео.html Don't be worried if your oil temperature is often at 100C / 212F or a little more, it is normal. Have fun!
Hey Caleb Pinell, Injector duty cycle is calculated from the injector pulse width and engine RPM... So we need to know those two items and then do some simple math: Duty Cycle (%) = (injector pulse width (in seconds) x RPM) / 120 OBDFusion, OBDLink and Torque Pro are apps that have an add on that you can purchase to data log the engine RPM and injector pulse width (for each bank) and then you can do the calculation. As for fuel pressure, the 370z/G37 engines don't have a fuel pressure sensor, so there is no way to view the fuel pressure. However, I have added a fuel pressure sensor and built a cheap fuel pressure data logging system, that measures engine RPM and fuel pressure (plus 6 other items) . All my fuel pressures (at different engine loads) and how to build the system will be shown in a future episode that is under development right now :)
I just checked my documentation and it looks like the 07/08 G35 with the VQ35HR doesn't support getting engine oil temp. :( As a work around, you could monitor the engine oil pressure while the car idles for 20-30 minutes... That should get your engine oil temp to around 80C / 176F. Good luck!
Understood... The 2008 G37 coupe seems to use 2007 ECU electronics with newer G37 software. Unfortunately, just because the engine has the oil temp sensor, doesn't mean the ECU will report it when asked via an app.
Hey KVJ, I am just wondering why you are asking about the fuel trims? I have been looking at them since I purchased the car in 2016. They are a little different than what I expect, but if you add the long term and short term (per bank) they are always about -5 to +5
i ask to make you aware of the fuel trims, just in case you didnt know about it . out of topic ... im getting my G37 sedan dyno tune this wednesday using ECUTEK . my mods are ( stillen G3 intake , stillen catback , and Berk HFC . ) hopefully i get 300 whp atleast .
Ahhh, I see. Actually, next week I am starting another channel that will explain all the amazing things a cheap ELM 327 scanner and Torque / OBD Fusion can do.
Is there a way to check the oil pressure with an OBD2 scanner with OBD fusion? You were such a big help with steering me in the right direction for the transmission temperature I almost feel bad for taking up your time. Thanks for the help again.
Hey bpatilo, Nope... The G37 / 370z don't have an oil pressure sensor, just a (low) oil pressure switch. The 350z did have an oil pressure sensor, but the signal went strait to the dash gauge and the ECU didn't see it. If you want engine oil pressure, you will need to install a pressure senor and gauge. WHICH is an episode that is under development right now - a DIY Oil pressure gauge for about $50
Hey Motorvate great video! I recently snapped off my oil pressure switch when trying to get the fill plug from the front differential off. Would it be bad driving without the switch on for a few days? I got a new one coming in that im going to replace. Thanks again! :)
Hey Daniel P, Thread locker is different than thread sealer. Thread locker prevents vibration from loosening bolts/nuts. Thread sealer prevents leaks from pressurized systems, like a oil pressure switch. In the past Teflon tape was used as a thread sealer and it still works well as long as you are careful about how you wrap the threads. An easier and safer way is a thread sealer, maybe something like: Permatex® High Performance Thread Sealant.
Hey xCkillaxC, Since most engines don't have an oil pressure sensor, (they have a oil pressure switch) there is no way to know the actual oil pressure, so....no need for an oil pressure PID. Now, oil pressure can be inferred from how well the variable cam timing is functioning. If the oil pressure us low, it will take longer for the cam to move to the requested direction. As enthusiasts, we would love to have this. BUT the main purpose of the OBD port is for emission testing and troubleshooting.
Motorvate DIY Wow still replying on a 3yr old video, what a boss. Yeah man I know it doesn’t work but one could only dream right lol. I’m looking to buy a G37s this month and highly doubt any owner will let me pull out a gauge and check their pressure lol so I guess I’ll just have to take a gamble...
Hey xCkillaxC, I check and reply to all comments every day. 99% of the time people are asking good questions and I like to do my best to help :) I don't have any hard data on this, but I don't think the galley gasket issue is very common. The car forums generally make small issues much bigger than they really are. I think the G37 Sport is a special car. It does so many things very well and looks wonderful! Good luck on what ever you decide!
Hey P Hanley, I am a long time VQ engine lover, ever since my 95 Maxima. AND yes, my VQ37VHR running well (so far!) In a future episode, I will show you how to build (or buy) a Bluetooth oil pressure gauge and use a free app to see your oil pressure. Thank you for subbing!
Hey Иван Грозный, Still working on it. As you can imagine, there are a lot of items that need to be researched and tested. The oil pressure sensor testing is done, as well as testing how well you can receive an Bluetooth signal from under a metal hood AND the micro controller programming is done. The next step is developing the app.
Hey Captain ADHD, Nice! Just make sure the oil is at 80C/176F when looking at the oil pressure compared to the factory spec. If you don't have an OBD scanner, but have a volt meter: • The oil is at 80C/176F when the voltage at the engine oil temperature sensor (while it is connected) is 1.20 - 1.22 volts.
Hey Richard Manzanarez, Thanks! You might want to subscribe as in a future video I will show how to build your own, inexpensive, digital oil pressure gauge, using an Arduino Uno or Nano. Pre-production should be starting next month :)
i want to buy a 2009 g37x with 63k miles, do you think i’ll have to worry about the galley gasket issue? that’s the only thing worrying me about the car.
What would happen if you left the oil pressure switch unplugged permanently in favor of a oil pressure guage full time? I'm trying to avoid an adapter to keep the oem pressure switch? Thoughts?
Hey Christopher Hamilton, What will happen if you remove the factory oil pressure switch? Nothing. The "low oil pressure" signal does not go to the ECM, but only to the dash to turn on the "low oil pressure light" From testing, the "low oil pressure" light is turned on at 4-5 psi, which it VERY low. (I have bench tested my sensor on my G37) Here is how the low oil pressure switch works: When the oil pressure is below 4-5 PSI, the switch closes and the light in the dash turns on. If the switch is not there, the low oil pressure light will not turn on, EVER. Which is OK, if you have an oil pressure gauge. Three days ago, I installed an oil pressure gauge on my G37 and removed the factory oil pressure switch and all is good! TLDR; It is fine and I have done the same :)
@@MotorvateDIY awesome. I was going to bother with a t adapter but now I'll not bother with that and go right into the upper pan not bothering with an adapter. Thanks bud! Also cant wait to see the pcv data soon!!
What ever you prefer. The old style teflon tape works well, just make sure to leave about 1/8" of the fitting tip exposed. This prevents any chance of tape getting into the oil system. A thread sealant also works well and there is no chance of it getting into the oil system, but they do take time to fully cure.
Hey James Dean Cooper, Yes, the oil pressure sensor would screw into the same location as the oil pressure gauge. Keep in mind, the thread on the engine is a 1/8" BSPT (british standard pipe thread). Most aftermarket pressure sensors are 1/8" NPT (national pipe thread) so you might need an adapter. Here is one I have used: www.glowshiftdirect.com/1-8-bspt-male-to-1-8-27-npt-female-thread-adapter/
My g37s coupe not driving like it has 330 bhp....plus I ave a check engine light. So I'm going to get it scan tomorrow. So if it's under 14 psi what u thing is wrong?
Hey Mccoy Henry, The diagnostic scan won't tell you your oil pressure, that needs to be measured with a gauge. If the check engine code is VVT (variable vale timing) related, then hook up a gauge to see what pressure you have at idle. The main cause of low oil pressure on our engines (VQ37) is a split rear timing cover gasket. This is an expensive repair as most of the front engine needs to be removed to get to it. Hopefully it's something easier and cheaper to fix.
if you measure i with a manual gauge could be the t oil pump, bad gaily gaskets , oil valve relief, in the worst case could be bad bearings , the stock electronic gauge is not accurate sometimes, the sensor unit can fail
@@MotorvateDIY nope. I had just finished up replacing the o2 upstream sensors. And was feeling like the top end was making too much noise. So i did a pressure check and bam 6 psi. Been like that i want to say for a few months now. No code. And since I am going to be doing a traveling jobs, figured i better look over everything before I'm 1,000 miles from home.
btw got to the galley gaskets today waiting on parts now. But I blew out my top end galley gasket for sure. Got a new oil pump, gaskets, timing chains, tensioners, and water pump on the way. 112k miles. Figured if I'm in there, get all of the major stuff done.
Just did my sons 2010 G37 same gauge kit, 26 psi idle and 68 psi at 2000 RPM what a relief, thanks
I'm glad you have peace of mind :)
What was the oil temp at those pressures, as those are some of the highest pressures I have seen. Also, was that 5W30 oil?
@@MotorvateDIY yes Mobil 1 5w30 we just changed 2 weeks ago. Oil temp was 178.
Thanks for getting back to me.
I will update my notes :)
I bought the same kit at local Harbor Freight. And looked under microscope all adapters. BSP threads have a 55° angle and have rounded peaks and valleys (Whitworth thread form). So none of them is true BSP. Only one, I assume number 3, has rounded picks, but the valleys are flat, like in NTP. So I ordered online 1/8 NPT-BSP adapter and it came with correct shape, rounded peaks and valleys.
Hey Eugene Ugryumov,
Wow, that is excellent information! Thanks for sharing it :)
Love the videos because I'm in the market for a g37 right now I learn a lot for you vids keep it up
Hey Cesar,
I am glad you like them and more episodes are in the works right now.
Didn't realize how easy it is to get an oil pressure reading, I got the Code P0021 and trying to check if it's at all related to the rear timing gasket, figured i might as well check my oil pressure but couldn't find a nice kit like the one you have.
Hey Doublea88,
Sorry to hear about the P0021 code.... Here is a link to the a kit very similar to the one in the video:
www.harborfreight.com/engine-oil-pressure-test-kit-62621.html
As a g35x vq35HR owner is very good to find this kind of helpful vids.
Thanks for sharing sir.
New sub 👍
Thanks for the sub!
Very nice video. Excellent explanation.
Do you mind letting me know which dongle you used for the torque app?
If I remember correctly, it was a VeePeak VP-11
www.veepeak.com/product/obdcheck-vp11/
Does this pressure checker have a long enough hose that you can rev the car and watch the gauge at the same time? Doesn't look like it in the box.
I think the hose was about 24" long, and I used a camera to watch/record it.
You might be able to prop it up, or support it from the hood to hold it up, so you can see it from the driver's seat.
This was an amazing help thank you for showing me . Just changed the sensor and checked my oil pressure
I'm glad the video was helpful :)
Great vid thank you. Do i bleed the air from the tester hose or just connect it
Just connect it... the tiny bit of air won't change the results:)
Any chance you’d know if the car would drive/perform differently with low oil pressure/failing gaskets? I bought a 2010 g37s and have almost put 3500 miles on it since and it starts and drives every time which makes me think that it’s fine. I also feel like logically, if the gaskets went bad or are going bad then the car would just not run or run really poorly. Any insight helps, I plan on having the oil pressure tested at a shop before the end of this year anyways.
Typically a P0011/P0021 (intake cam phasing problem) and maybe a P0524 (low oil pressure) will pop up.
BUT, I don't know how much bearing wear/engine damage may happen before those codes pop up.
Getting your oil pressure check is a good idea!
I have a 2019 370Z with about 67K miles on it and had an oil pressure check done on it. With 5W-30 Redline oil, the idle oil pressure was an excellent 30 psi but the oil pressure at 2,000 rpm was a disappointing 50 psi. I was wondering what might cause such a good oil pressure at idle to become somewhat lackluster at 2K rpm. I know the spec at 2k rpm is 42 psi so the engine isn't in danger of self-destructing. My assumption was that main bearing or big end connecting rod bearing wear would probably be the cause of lower oil pressure, but if that were the case then I would have expected the idle oil pressure to be low also. Maybe I'm missing something obvious.
30 psi at a hot idle (oil temp 80C/176F) is the highest I've ever heard of.
Do you have an oil cooler and sandwich plate? If the pressure sensor is installed in the sandwich plate, it shows the oil pressure BEFORE the oil filter and this typically reads higher by an estimated 3-5 PSI. The factory oil pressure port is AFTER the oil filter, and shows the actual oil pressure inside the engine.
As I see it, if you oil pressure is above factory spec, don't worry about it and just go for a nice drive, you won't hurt anything!
@MotorvateDIY Thank you very much for that reassuring information. I find all of your content on these Nissan engines most interesting and helpful.
My oiling system is stock, except for an oversize oil filter that is meant for the 5.6 liter VK engine. The filter is identical, except that it is about 50% taller than the short one recommended for my VQ37 engine. My reason for using it was to try to compensate for the higher flow resistance of the more restrictive Fram Ultra Synthetic/Endurance filters I use on the car. These filters are published to have better than 99% filtration efficiency for particles 20 microns in diameter and larger, hence my reason for using them, but the tradeoff is a higher pressure drop across them.
BTW: I really like the analysis you did where you measured the effect of oil temperature and engine rpm on oil pressure in the VQ engine. I'm a retired physicist who really enjoys seeing your methods and practices in this work you do for us.
Keep in mind, the oil bypass valve in the oil filter typically opens at 14psi.
So if the "more restrictive Fram Ultra Synthetic/Endurance filters" increase the pressure differential close to that value, you may not be filtering any oil, since the bypass valve opens.
For me, I've always used the manufacture's oil filter.
In the spring I'm going to be measuring the oil pressure before and after the oil filter... just to see what is is, at different oil temps and engine RPM.
I'll also try a few different oil filters and see how they compare to the stock Nissan filter.
@@MotorvateDIY That is a great idea! Içll look forward to seeing it.
I did find a site that built a setup to pump heated oil at pressure through engine oil filters, with pressure gauges before and after to calculate the pressure drop. From what I remember, these Fram filters were only slightly more restrictive than the stock filters but were significantly better in their filtration efficiency of particles ranging down to 20 microns. My thinking was that if there was about a .002" clearance in those bearings then the running clearance would be about .001", or 25 microns, with the journals spinning in a hydrodynamic state. I would be most concerned with particles in the 10 to 20 micron range that would be most likely to fit between the gap and get lodged in the soft metal of the bearing shell. Aside from the Mann filters that seemed to offer excellent filtration efficiency at these small particle sizes, the top of the line Fram filters also seemed to do an excellent job and at a good price with good availability.
My rough calculation of the reduction in pressure drop across a filter that was 50% taller with a 50% greater surface area for filtration would be about ⅔ of the pressure drop for the smaller filter. I really would be interested in seeing what kind of pressure drops we are getting across these filters. One thing that I don't like with these oil coolers with their thermostatically-controlled sandwich plates and sharp bend oil lines is the possibility of further causing more of an oil pressure drop.
I don't comment much but bravo, great video and great split views of the pertinent information!
Well then, thanks for commenting :)
I hope your oil pressure was in spec.
@@MotorvateDIY it was, got 24-25psi at idle(fresh oil) so just need to keep an eye on it since mine is a 2011.
Great video and very helpful information. I own a 2011 G37 with 90k miles and very concerned about the oil galley gasket issues. I'm dreading having to do the teardown and work myself as it's a bit above my knowledge and experience.
I'm glad you like the video.
One of the main reasons I made it, was to check my oil pressure before the warranty expired.
In my case, so far, so good!
@@MotorvateDIY Good to hear.
Could you also use an oil filter sandwich plate with npt outlet?
Yes you can.... BUT keep in mind the indicated pressure will be a little higher, maybe 2-3 psi. With the sandwich plate, you are measuring oil pressure BEFORE the oil filter.
When the gauge/sensor is connected to the factory position, you are measuring oil pressure AFTER the oil filter, and this is the same oil pressure that is used to lubricate the crankshaft, connecting rods and everything else.
Great video! After doing this, I decided on installing my own oil pressure gauge. I have an 1/8th 27 NPT oil pressure sensor as well as a sandwich plate with 1/8th 27 NPT threads for the sensors, however, the threads seem to lock-up less than half through. I don't know what I'm doing wrong. I don't want to have any oil leaks or destroy the threads. Am I just overthinking this?
If you can turn the NPT fitting by hand and get about 1/2 way on, I think that should be ok. Make sure to use a liquid thread sealer or Teflon tape (just don't tape over the end of the fitting, as the tape can tear off and get into the oil, potentially blocking an oil passage)
Here is an excellent article on NPT fitting and how much to tighen them:
www.pegasusautoracing.com/document.asp?DocID=TECH00097
Good luck!
BSP is what you have and want , how do you have NPT sensor? Is it a aftermarket?
He is using an aftermarket oil pressure sensor and it screwing it into an oil filter sandwich plate. Everything there is 1/8" NPT :)
i have an aftermarket glowshift oil pressure gauge the last couple days once my car is warm my gauge reads like 10-12 psi at idle , but whe im driving the oil press gauge reads fine i dont know why my oil press is too low at idle, i bought a cosworth high pressure oil pump it was installed in my 03 nissan 350z supercharged
Hey yoshi z33,
When measuring oil pressure and comparing it to the spec in the manual, you need to know the oil temperature.
Here are the factory oil pressure specs for your engine (VQ35DE) when the oil is at 80C or 176F:
• Idle > 14 psi
• 2,000 RPM > 43
• 6,000 RPM > 57
If you measured the oil pressure and the oil was hotter, your pressure readings would be a little less.
To my surprise, it looks like your engine doesn't have a factory oil temperature sensor, so this will make it harder to know when your oil is at the proper temp.
When you factor in oil pressure gauge accuracy (typically +/- 2% of full scale or about -2 to +2 PSI for a 100 PSI sensor) and I suspect your checked the oil temp at more than 80C / 176F which would give you a slightly lower pressure, I don't think you need to worry.
10-12 PSI at idle is fine, as the lubrication requirements are low at low RPM.
After driving the car easy for 10-15 minutes, check your oil pressure at 2,000 RPM.
My guess is it will be in spec :)
@@MotorvateDIY thanks for the info 👌🏿👍
Anytime :)
Awesome video . Do you know the oil pressure pid equation for torque pro ?
Since most engines (for Nissan/Infiniti anyways) don't have an oil pressure sensor, that data is not available.
Would faulty vvt solenoid cause low oil pressure?
That is a really good question!!
If the VVT solenoid is stuck on the "drain" position, the oil pressure will be a little (~5 psi ?) lower.
However, the VVT solenoids are easy to check by applying 12v to them for a split second and see if they click.
What year is yours? Mine was pointed upward toward the alternator. Amazing how their different
Well... Your G is all wheel drive and mine is rear wheel drive.
I'm glad you didn't let that stop you :)
Is there a PID for actual oil pressure?
Unfortunately, there isn't.
My guage in the car was all over the place in my 04 350z with the engine at op temp the manual guage rest at 30 at idle i was told thats great oil pressure
If the oil was at 80C/176F that is good oil pressure. The factory spec is > 14 psi at a hot idle.
Hi, today i will check my oil pressure, does m10 thread is same as 1/8 bsp?
No, they are different. The port on the engine is 1/8 BSP and you need to get an adapter to connect to your pressure gauge.
When tightening the 1/8 BSP connector if you over tighten it will split the port on the engine and you will have an oil leak. The BSP port is tapered and typically you only need 1-2 turns after finger tight.
Good luck!
Great video! Keep them coming!! I am interested in installing a permanent oil pressure gauge soon to monitor possible rear main timing cover seal failures that are pretty common. What made you want to record this video?
Hey Stephen,
Thanks for the kind words!
Why did I make this video? For the same reason you mentioned, the rear timing cover gasket issue. When this video was shot (Aug 2016) I still had 500 miles of factory warranty and wanted to know if I had the issue.
As a side project I am going to be building an oil pressure gauge using a digital pressure sensor and an Arduino (inexpensive micro-controller)
My plan is to have a very small digital display (10mm tall) in a easy to read spot or maybe part of the dash.
Awesome, interested in what you come up with. I was hoping to build a wireless gauge (definitely digital) that does a max PSI of 200. I found information that this needs to be installed somewhere after the oil filter as that's where the pressure drops. So apparently not the sandwich plate near the oil pan.
Other thought is, someone was able to read this info with Torque and Infiniti EX addon I believe. Going to do some digging to see if I can find the thread. If so that might be my route to check on it once in a while.
How did you get torque to read more data? It says no data for MAP, MAF, fuel pressure...etc
I used the Infiniti EX plug in.
Hey wasup , i have a q50S rwd 3.7 2015 model. It’s supercharged. My low oil pressure light comes on and then goes off then comes back 2 days later. I checked the oil its at H still on the dipstick. Fresh oil change using amsoil. No leaks. Engine runs great. No cel . No weird noises . I changed the sensor to a new oem oil pressure sensor. Think its faulty wiring?
If that single wire that is on the factory oil pressure switch touches ground, the red oil light will turn on. Check the wire from the switch to the IPDM/ER for any damage.
On a different note, your Q50 must be a lot of fun to drive !!
@@MotorvateDIY yes definitely just tryna figure out this fuel pump issue maybe i need a bigger one im using 340 aem fuel pump. & it was the wiring for oil pressure light lol
Thanks a lot for the video, it has been really helpful! I have a 2008 G37 and I measure the oil pressure at idle (700 RPM) to be 10 PSI. At 2000 RPM, the oil pressure does not quite reach 40 PSI. I am doing some work on the front end of the car because I hit a deer. I already have to replace the front bumper and radiator. Would you recommend doing a galley gasket repair while I have access? I am trying to decide whether its worth it. The car runs great but has 165k miles. Also, when I did the oil pressure test, the car was on ramps so that I could get to the oil pan. Does that matter for running the test?
If your oil pressure is at 10 psi at idle, I suspect your galley gaskets are leaking.
Having the front on ramps won't change the oil pressure. In the video, my car was also on just the front ramps.
Generally the VQ engines are very durable and last a long time. My 95 Maxima had 246,000 miles on it when I sold it.. and it still ran great!
If the rest of the car is in good condition, I do think it is worth it to replace the galley gaskets. For the cost of that, that should give you an additional 100,000+ miles.
Good luck for what ever you decide :)
@@MotorvateDIY Great information! Yeah I like the car and it otherwise runs well. I think I will take the time to have the gaskets replaced. Is there a good reference you would recommend for doing that. Thanks again!
Since my galley gaskets are OK (so far) I don't have a good reference for you.
Search around and I'm sure you will find a few.
Good luck!
Hey Motervate, I'm looking into buying an 08 g37 with 88k miles on it.. I'm not sure if the owner will allow me to set up a guage on his car.. It's invasive.. Is there anything I can do to test the car, audibly or visually that's not so intrusive to test for this problem?
Not really. All you can do is check for codes like P011 and P021.
I don't think this issue is very common, but it is expensive to fix.
@motorvate DIY I know this is an old video but just a quickk question, i tested my hr g35 sedan last night and the pressure was awesome just like yours in the video but the fitting on the oil switch was leaking just a little bit of oil like maybe a drop every 3 seconds, will this throw off my reading at all? I was thinking it would maybe actually show a little lower of a reading because it was maybe loosing a tiny amount of pressure?? Wasnt that loose at all just curious!
It may be an old video, but as the VQs get older, this check needs to be done more than ever :)
A few drips from the pressure gauge won't have any measurable change in the indicated oil pressure. You have nothing to worry about :)
@@MotorvateDIY awesome, now i dont have to worry about babying it and drive it the way it was intended :) thanks again for all the great information and responding !
I think my galley gasket might start to go out...any suggestions before I go on with that ?
Hey Anup Patil,
Sorry to hear about that!
If your oil pressure is below 14 psi at idle when the oil temp is 80C/175F I think the galley gasket is the most likely issue. :(
What are your oil pressures?
Hey brother quick question, I couldn’t get a completely tight seal for some odd reason so I did it with the fitting dripping very slowly. Would that affect the oil pressure at all? I think I got fairly good readings with 46 psi at 2k rpm’s & 26 at idle.
You are fine... a slight drip won't make any measurable difference.... AND you don't risk cracking/splitting the oil port in the upper oil pan.
46 & 26 are good numbers :)
Is there any reason to not use a sandwich plate for an oil pressure gauge?
i have seen a few threads where people broke the housing for the oem pressure switch on the upper oil pan. ive also seen threads with people snapping the oem pressure switch. I dont like the idea of adding a tee setup.
That is an excellent question!!! The sandwich plate will give a higher oil pressure than what is in the engine. This is because it is the sandwich oil pressure is BEFORE the oil filter. The engine oil pressure is AFTER the oil filter and this can be a difference of 3-5 PSI (as a guess, I don't have had data on this... YET)
Bottom line, if you don't over tighten the oil pressure sensor, you won't split the aluminum. Most don't understand that it is a tapered fitting, so you can't go by feel. Look here: www.pegasusautoracing.com/document.asp?DocID=TECH00097
Generally for 1/8" NPT, after finger tight, you only tighten 1.5 to 3 turns.
I start with 1.5 and then check for leaks. No leaks = done. slight leak means an addition 1/2 turn and check again.
@@MotorvateDIY Im reading a thread now where a guy broke the upper oil pan just removing the switch. the idea that it is so sensitive adding a tee with extra leverage seems like asking for trouble to me.
3-5 psi sounds negligible to me. am i missing something?
btw, thank you for making this video, and thank you for sharing your thoughts on the subject with me.
What equipment would you connect to the oil filter sandwich plate? I.e. what sensor?
(Sometimes comments hide from me and then pop up... like this one!)
The only time the upper oil pan cracks is due to over-tightening. The threads are tapered, and if you tighten it too much, you force apart/split the port.
As mentioned in the video, I only tighten it enough to prevent it from leaking and check it the next week -OR- go by the factory spec of 11 foot lbs. A good thread sealer liquid also helps.
However, if you want to use a sandwich plate, go right ahead, since you know the reading will be a little higher than actual, your good.
I do have a sandwich plate, and have wanted to do an oil pressure comparison between the plate and the engine port... Maybe I'll get to that this summer.
@@MotorvateDIY nice, i would be interested in the subject if you put out the data between the two. thanks and thanks for your additional feedback.
Should the gallery gasket flaw keep me from buying a pre-2013 G37?
Hey Terry1212,
Well... that is a tough question to answer!
Overall, I don't think it is a common issue. I think the G37 forums tend to make us think it is more common than it is.
However, for those it has happened to, it is an unexpected and costly expense.
As part of the pre-purchase inspection, I would make sure the oil pressure is measured (> 14 psi at 80C) and decide from there.
If you do purchase a G37, when the engine is cold, I would keep the RPM under 2500 for the first 20-30 minutes. Cold oil is VERY thick and the oil pump in the G37 is a high volume pump. On my car during a cold start, I have seen the oil pressure MORE than 120 PSI!
I often wonder on the gaskets that have failed, how did the owner drive the car on a cold start?
Anyways, the G37 is a wonderful car and generally has been VERY reliable and a lot of fun to drive.
@@MotorvateDIY interesting. I'll be more careful with mine on cold starts but unfortunately I've had the car since 2013 so the damage would be done if any at all.
@@behindthen0thing I have a 2019 370Z that has an oil temperature gauge. On a cold start, I let it idle until the coolant gets up to temp, which is pretty quick and takes a few minutes. I then drive away with my revs not exceeding 2K with only gentle acceleration until the oil temp gets up to 180⁰F, usually within 4 or 5 miles. My car has 67K miles and uses no oil, as indicated on the dipstick, during the 3K mile oil change interval and has a hot idle oil pressure of 30 psi with the Nissan recommended 5w-30 oil.
I have the same kit and when I go to install the correct fitting I only get about one thread in before it stops. When I pull out the fitting there are a few marks like something is preventing it from going in further and I don't want to push it any further because I may damaged something. What should I do?
I ended up just ordering the correct one from parker haniffan for like $30. Its stainless steel
Sounds like you got it figured out!
Fuck, was that square fitting giving you issues aswell?
Did that fitting work for a 2013?
Could you have left the sensor in and checked the oil pressure reading via the Torque App?
Hey TireSlinger81,
Good question.... but the answer is no.
When Torque starts, it gets a list of engine sensors (actually called PIDs) from the engine control module (ECM)
This car (or any other car I have seen) do not't have an oil pressure PID, it won't show up in Torque.
@@MotorvateDIY by any chance you know if this app will see a pressure sensor for 2007 Cadillac Escalade ?
Hey Andre Desouza,
I'm sorry, but I don't know. Most of my research is on Nissan, Infiniti and a little Mazda.
@@MotorvateDIY thanks for responding back !!!
very insane the 2007 2008 Cadillac Escalade doesn't have oil pressure on the dashboard
Hey man! My 350z is reading about 10-12 psi at stop lights when driving, I'm about do follow theses steps and check my oil pressure, what happens if it is low?
TIA!!
If you have an automatic transmission, it must be in park or neutral to get an accurate oil pressure reading. (the idle is a little lower when stopped in drive)
As mentioned in the video, the spec for oil pressure on the DE/HR and VHR engines is more than 14 psi at a hot idle (600-700 RPM) and more than 43 psi at 2,000 RPM WITH the oil temp at 80C/176F.
If the oil pressure is low, the crank/cam/connecting rod bearings will start to wear very quickly, resulting in a knocking sound. This kills the engine quickly.
One "common" issue on the 2007-2008 350/G35 is the "galley gasket" blowing out. This created an internal oil leak, and reduces the oil pressure.
As for your 350, I know the factory gauge is not easy to read when the pressure is below 30 psi and you can only guess at the pressure.
Once you check it with a mechanical oil pressure gauge, my guess is that your oil pressure is OK. Even if it is 12ish psi, I would just keep an eye on it as I don't think that is low enough to cause damage.
I think the 2,000 RPM pressure (> 43 psi) is more important, as the engine spends more time at or above that RPM.
Good luck and feel free to up me on your results!
Question, do you know of a solution I can permanently hook up a oil pressure sensor and have it remote transmit so an app like torque can read it (maybe with a plugin or some sort?). I am guessing not. I need to do this though as my engine VQ35HR is prone to the oil galley gasket failure, and the only way to tell if it's starting to go it to monitor the oil pressure regularly.
Hey Ryan Vanderwerf,
We have the same concern regarding the oil gallery gasket failure as it is the same on the VQ35 and VQ37 engines.
I am not aware of any remote oil pressure sensors.
However, as time permits, I have been working on an Arduino (inexpensive open source micro controller) based oil pressure and temperature gauge with a small LED display to keep track of my oil pressure and temperature.
Down the road, if all goes well, it will be an episode.
Ryan Vander, This is one of those problems that happen to a few cars and everyone expects it to happen to theirs. Not to say it does not happen because it does. I would just keep an eye on your dipstick, and so long as you are not getting the oil light or sounds of death from the engine, you should be just fine. Do note that Nissan has a tiny oil filter and requires more frequent oil changes as the filter gets full pretty fast. This may affect your pressure if the filter's bypass is not working properly.
Hey motorvate DIY, my idle while warm usually flickers between 13-15 psi and even sometimes up to 17 psi when my oil temp is around 80C. Do you think my gasket is about to go?
also my cold start is around 103 which I believe is normal for these cars and when I'm ranging from 2k to 2.5k rpm, my oil pressure is at 60-80.
Based on the data from my G37, if my car is good, so is yours. Idle is > 14 PSI At 80C/175F. Cold start of > 100 psi is normal.
I think your galley gaskets are good :) Just keep an eye on the idle oil pressure :)
@@MotorvateDIY thank you for the reply!
Hey motorvate, my car won't go past 4k rpms but goes through the gears just fine. The infiniti mechanic said that on my 2011 g37x the oil pressure sensor was broken and the oil temperature sensor was reading incorrectly and that those were the things causing me to be in like a "safe mode" does this make sense? Also curious what the torque spec is for the oil temperature sensor
At the very top of the video description is says:
*** Tip: Don't over tighten the oil pressure switch, the factory shop manual specifies 11 foot pounds. ***
An easier way is to only turn it 1.5 - 3 turns past finger tight. On my car 2 turns was perfect. Also don't forget to use a thread sealer.
Source: www.pegasusautoracing.com/document.asp?DocID=TECH00097
From the factory, there is a 4K soft limiter when in park or neutral, so that is nothing to worry about.
The oil pressure switch doesn't do anything but turn on a light in the dash when the oil pressure is 4 PSI or less. I removed mine a year ago to add my oil pressure gauge. - It isn't needed. If you do have low oil pressure, you will have cam phasing codes (ex P0011/P0021) way before the low oil pressure light turn on.
Oil temperate IS critical to proper engine operation. If the engine computer thinks the oil temp is too high, it will reduce engine RPM... I think that is the single root of your problem.
@@MotorvateDIY This video does not work for the 2011 G37x - Do you have any recommendations? I cannot seem to get a wrench on the oil pressure switch it is extremely tight space and the positioning is on top of the oil pan not on the side. Please advise
As you noticed, since your car is AWD, the location of the oil pressure switch is different.
Since my car is RWD, I can't offer any suggestions as I don't have any first hand experience. You could try getting a oil pressure switch socket and that may give you easier access to loosen it.
Hello, my coolent temperature never crosses 185 F, doesn't matter how long I let it idel and even after 45m to an hour drive. Or is this normal? You think my coolent sensor maybe have an issue!!
By the way thanks as always for your detail videos, my oil pressure looks good :)
Hey Ifteker Jaigirder,
The spec for the G35/G37 is for the thermostat to start opening at 80C / 177F and start to close at about 77C / 171F.
You engine coolant temperature is VERY closely checked by the ECU (engine control unit). On a cold start up, it will compare the engine coolant temp to the air intake temperature. ALSO the ECU watches how much the temperature over time when the engine is warming up.
Soooo.... If you don't have a check engine light, I suspect everything is good :)
If you want to learn more about all of the engine sensors on the VQ engine, please have a look at my other channel: ruclips.net/video/CXDX-89_ArU/видео.html
@@MotorvateDIY thank you, feel lot better now. By the way I followed your oil pressure video and my pressure is good. I did manage to break sending pressure unit lol, but got a new one installed, it was a pain though, my structure on X is little different then S, bars and hoses are all cramped together, no space to move plyer or wranch. Took me a while but finally got it done. I even bought the same kit as yours from HF :) I am glad I found you on RUclips. You speech, detail step by step, video quality and editing is perfect, you should have a TV channel :)
Oh! I am still waiting on upstream 02 sensors replacement video! Hopefully next summer?
Hey Ifteker Jaigirder,
Sometimes I wish my G37 was all wheel drive, so the video would be relevant to more people, but I really prefer a manual transmission and proper (rear wheel :) drive.
Thanks for your kind words on the production works. I really appreciate it!
As for replacement of up stream O2, when I replace mine an episode will be made.
Hey @motorvateDYI , would these specifications be the same for a 2008 350z Nismo, or are they different?
I just looked up the 2007-2008 HR engine oil pressure spec and it is the same. At 80C / 176F oil temp: more than 14 psi at idle and more than 43 psi at 2,000 rpm.
@@MotorvateDIY thank you for the reply, I really appreciate it. I’ll be picking up a 350z nismo next week! What are other things you suggest to keep an eye out for? The Nismo I’ll be picking up only has 6000 miles so not enough wear to be concerned about, but I still want to inspect it and take it to the Nissan dealership to get an inspection.
Will this method diagnose a galley gasket issue? I have an 11 IPL G With 40k miles
Hey TLE0622 IPL,
YES!! That's why the episode was made :)
I wanted to check my oil pressure before the warranty expired and so far so good.
Tip: Don't over tighten the oil pressure switch, the factory shop manual specifies 11 foot pounds.
Motorvate DIY crazy how Nissan decides to cheap out on important parts. Sadly a $2-3k fix for a $25 part that was revised on the MY12 and up G and Zs
Hey TLE0622 IPL,
I see your point.... but it doesn't happen to ALL VQ37 and the internet is good at making a small problem seem much larger that it really is.
However, if you have the issue, then it is a big problem :)
I have always wondered if high engine RPM on a cold engine is part of the problem. With the VQ37, the engine oil pressure on a cold start up is more than 100 PSI which may stress the older style galley gaskets.
Hey Chris Francelli,
To minimize the excessive pressure on the galley gaskets, I keep the engine RPMs under about 2,500 for the first 15 min after starting a cold car, with outside temperature less than about 15C / 60F.
The engine in the G37/370z has a high volume oil pump and oil pressure is much higher when the oil is cold.
I don't have any proof of this making a difference, but the logic works for me.
On a future episode, I will be showing how the oil pump works (it it more interesting than you think!) and will show the crazy volume it puts out.
Motorvate DIY Hi. I’m looking for a used G37 possible a 2011. If the oil pressure on it is normal, should I consider it? Does the oil pressure plummet instantly or does it fall gradually as the galley gasket becomes weaker and weaker?
Just got a engine for my car and it is installed now it was used with 79k miles and on idle oil pressure drops . When running , oil pressure is fine. Shoul I stop driving the car completely? Or what is my best bet
My car is a 2010 Infiniti G37 and the motor I bought was from a 2009 Infiniti g37
At idle, what does the oil pressure drop to? As you know the spec is more than 14 psi at 650 RPM with the oil at 80C / 176F. Are you close to that?
Hey Motorvate. So I had the galley gaskets go out on my g37s . I had them replaced but the oil pressure still reads low at 5 psi. Any advice on what it may be? Please help thank you.
Hey Juan Rendon,
Sorry to hear about that!
If the galley gaskets resulted in low oil pressure for a while, it can wear the crankshaft & connecting rod bearings, resulting is additional clearance between them. This can lower the oil pressure.
How does the engine run now?
Can you measure the oil pressure with a different gauge to rule out a bad gauge?
@@MotorvateDIY So I just spoke with the mechanic that is doing the job. Before he replaced the gallery gaskets the oil pressure was at 9 psi. and after he replaced them he placed a gauge to check the psi while test driving and that it read normal when driving but when he was stop at idle the psi would drop to 5 psi. I'm going to have him check the oil pressure relief valve next. Got any advice on anything else that it might be?
Hey Juan Rendon,
No harm in checking the oil pressure relief valve, as old gasket material could be holding it partly open.
As for other items to check, I can't think of anything.
@@juanrendon9662 I would also be curious as to possible oil pressure fluctuations at idle, as these might be indicative of worn crankshaft or con rod bearings that have developed excessive journal to bearing metal clearances.
Can 5W40 affect engine oil pressure negatively to VQ35 or VQ37?
I do plan on doing a test in the spring of the difference in VHR engine oil pressure between 5/30 and 5/40.
Based on the slightly higher viscosity of the 5W40 I would expect slightly higher oil pressure. How much higher, I don't know.
@@MotorvateDIY can 5w40 hurt our VQ HR engines in any ways?
I don't think it would hurt anything, but I don't have any first hand experience as the recommended oil is 5W30.
You can always try it and see for yourself. I think a few guys that run turbos on their G37/370 do like to use a thicker oil like a 5/40.
@@MotorvateDIY I already tried 5w40 on my VQ35HR, but it’s a hit heavy on city driving.. Do you think synthetic 5W30 oil can protect our VQ engines even we use over 7k RPM?
I do think 5W30 does a good job protecting the motor at all RPMs, low and high.
One thing you should keep in mind is that at high RPM, the oil pressure is also very high. On the VQ37VHR at 100C / 212F oil temp, the oil pressure is more than 100 psi. This ensures the lubrication requirements are met and probably exceeded.
What’s the factory oil pressure psi for vq35hr engines? Is it same with yours?
Yes... the HR and VHR have the same oil pressure specs.
@@MotorvateDIY mine’s oil pressure sensor unit is broken and i retapped the thread and put a new long nut there.
While mine is already got replaced with enhanced gallery gasket and valve cover gaskets, may I know if I have to worry about low engine oil pressure?..
With new oil gallery gaskets, you should be good to go!
@@MotorvateDIY thank you for replying sir!
Do you think our v36 g sedan’s factory oil pressure works well?
I’m wondering if i should install oil pressure gauge along with oil filter sandwich adapter.. or can i just keep driving my car without worrying about the oil pressure sensor removed…
Currently mine is v36 g35s under 80k miles and changing engine oils every 5months/3k miles…
The G35/G37 use an oil pressure switch. Based on bench testing, it turns on the low oil pressure light when the pressure is 4 psi or less. That is VERY low!! Typically you will have cam phasing codes (P0011/P0021) due to low oil pressure way before the low oil pressure light turns on.
An oil pressure gauge is an excellent idea! It allows you to keep an eye on the actual oil pressure, which just may save your engine if something happens.
A sandwich plate works well, but the oil pressure reading will be slightly higher (~1-5 psi) as you are sensing oil pressure BEFORE the oil filter.
The factory oil port is connected AFTER the oil filter and it the same pressure as the main oil galleries.
On my G37, I removed the factory oil pressure switch about 2 years ago, and replaced it with a 150 PSI pressure sensor.
So, you have 2 good option! Any oil pressure gauge is better than no oil pressure gauge!
Hey Motorvate, Hope all is well with you. i have a question.
I had my gallery gaskets done because I had low oil pressure. So i checked my readings now after the work was done and i now have 17psi at idle and 42psi at 2k rpm. Any advice?
Hey DevilG,
Yes, I do have some advice - relax and go for a drive :)
The spec is more than 14 psi at idle and more than 43 psi at 2,000 RPM with the engine oil at 80C / 176F.
At idle you are good!
At 2,000 RPM you are close enough :)
Also, oil pressure gauge accuracy can vary from 1-3% or more of the full scale value. (1-3 psi for a 100psi gauge) With the gauge showing 42 psi, I don't think you have anything to worry about.
@@MotorvateDIY ah i checked again at 80'C since she was probably warmer when i got home. Shes 18 and 48 now. Ill drive her and see what happens over time.
I guess after new metal gaskets i was hoping for numbers closer to yours lol Anyhow thanks for the quicky reply and advice . You are awesome man, cheers 🍺
Hey DevilG,
Thanks for your kind words! Now, go for a drive and enjoy your good oil pressure :)
@@devilg37 you need to change your engine right away!
Hey Motorvate, have you planned on installing a permanent oil pressure guage for your G? Was thinking of installing one myself, because I fear the dreaded code. Was gonna go for the non mechanical guage.
Hey Daniel P,
My gosh... are you reading my mind? :)
In the spirit of "doing it yourself" I am in the process of designing/building an inexpensive digital oil pressure gauge for a future episode.
This will use a $25, stainless steel, 150 PSI digital pressure sensor, a $10 Arduino Uno clone, and a $10 small 128 x 32 pixel OLED display.
When I write the software for it I plan to show the highest and lowest oil pressure and have it flash red when the oil pressure is below 14 PSI. (the factory minimum at idle)
It will be a different kind of episode, but I think it will be helpful.
Motorvate DIY Cannot wait to see this episode!! Love all your videos!
Hey Daniel P,
:)
@@MotorvateDIY Any progression with your Arduino / OLED display for oil pressure project? Thanks!
Did you end up making the video?
I have the p0011 and the p0021 but not p0524 ,you think that my galley gaskets are bad ,2012 g37 ,105000 milles
The only way to know for sure is to check your oil pressure. It is a bit of a pain, but an early check just might save your engine.
@@MotorvateDIY I did bought a pressure tester OTC brand and the car has 30 psi at idle and 70 psi at 2000 rpm
I just recently got those 2 codes also on my 2004 g35(215k miles). Car started making noise somewhere from the engine even though i havent heard it the past few days and is constantly about to stall or does stall every time i come to a stop. Replaced both VVT solenoids and actuators. Didnt fix anything. Next step is to check oil pressure once my gauge gets here and then im going to check the timing tensioner and chain to see if anythings wrong there. If all looks good at that point im not sure what im going to do unless my code reader(bluedriver) just completely threw me in the wrong direction.
I am running torque pro on my g37 I can't get oil temp on the app can you help please
Hey Caleb Pinell,
I sue can... How about a step by step video :)
Oil Temp Gauge w/Torque Pro - Motorvate’s DIY Garage Quick Tip #2
ruclips.net/video/8oc7szSr-Xk/видео.html
Don't be worried if your oil temperature is often at 100C / 212F or a little more, it is normal.
Have fun!
@@MotorvateDIY thank you what about injector duty cycle and fuel rail pressure
Hey Caleb Pinell,
Injector duty cycle is calculated from the injector pulse width and engine RPM... So we need to know those two items and then do some simple math:
Duty Cycle (%) = (injector pulse width (in seconds) x RPM) / 120
OBDFusion, OBDLink and Torque Pro are apps that have an add on that you can purchase to data log the engine RPM and injector pulse width (for each bank) and then you can do the calculation.
As for fuel pressure, the 370z/G37 engines don't have a fuel pressure sensor, so there is no way to view the fuel pressure.
However, I have added a fuel pressure sensor and built a cheap fuel pressure data logging system, that measures engine RPM and fuel pressure (plus 6 other items) . All my fuel pressures (at different engine loads) and how to build the system will be shown in a future episode that is under development right now :)
Thank you for your help and taking the time to help me
No problem. Thanks for watching the video :)
Is it just me or is that square adapter impossible to put on?
It shouldn't be too difficult, assuming proper alignment and correct threaded adapter.
Just be gentle and keep trying :)
i cant read oil temp in my g 2008 not showing
I just checked my documentation and it looks like the 07/08 G35 with the VQ35HR doesn't support getting engine oil temp. :(
As a work around, you could monitor the engine oil pressure while the car idles for 20-30 minutes... That should get your engine oil temp to around 80C / 176F.
Good luck!
@@MotorvateDIY mine 2008 g37 vq37 , engine have 2 sensors near oil pan , any idea ?? only i can read coolant temp .
Understood...
The 2008 G37 coupe seems to use 2007 ECU electronics with newer G37 software.
Unfortunately, just because the engine has the oil temp sensor, doesn't mean the ECU will report it when asked via an app.
@@MotorvateDIY i got your point . thanks a lot , but if I put 2009 or newer G model ECU it will read it ??
Unfortunately, I don't know. :(
thank you . very informative .
just my 2 cents .. you might want to check your Long / short team fuel trims . using the Torque app .
Hey KVJ, I am just wondering why you are asking about the fuel trims?
I have been looking at them since I purchased the car in 2016. They are a little different than what I expect, but if you add the long term and short term (per bank) they are always about -5 to +5
i ask to make you aware of the fuel trims, just in case you didnt know about it .
out of topic ... im getting my G37 sedan dyno tune this wednesday using ECUTEK .
my mods are ( stillen G3 intake , stillen catback , and Berk HFC . ) hopefully i get 300 whp atleast .
Ahhh, I see. Actually, next week I am starting another channel that will explain all the amazing things a cheap ELM 327 scanner and Torque / OBD Fusion can do.
Is there a way to check the oil pressure with an OBD2 scanner with OBD fusion? You were such a big help with steering me in the right direction for the transmission temperature I almost feel bad for taking up your time. Thanks for the help again.
Hey bpatilo,
Nope... The G37 / 370z don't have an oil pressure sensor, just a (low) oil pressure switch.
The 350z did have an oil pressure sensor, but the signal went strait to the dash gauge and the ECU didn't see it.
If you want engine oil pressure, you will need to install a pressure senor and gauge.
WHICH is an episode that is under development right now - a DIY Oil pressure gauge for about $50
Great video
Thanks, I appreciate it!
Hey Motorvate great video! I recently snapped off my oil pressure switch when trying to get the fill plug from the front differential off. Would it be bad driving without the switch on for a few days? I got a new one coming in that im going to replace.
Thanks again! :)
Hey Daniel P,
Yes, it is safe.
** Be very careful not to over tighten the replacement switch and use a thread sealer. **
Motorvate DIY thank you so much! Also would blue thread locker be fine or do I need better stuff?
Hey Daniel P,
Thread locker is different than thread sealer. Thread locker prevents vibration from loosening bolts/nuts. Thread sealer prevents leaks from pressurized systems, like a oil pressure switch.
In the past Teflon tape was used as a thread sealer and it still works well as long as you are careful about how you wrap the threads. An easier and safer way is a thread sealer, maybe something like: Permatex® High Performance Thread Sealant.
Motorvate DIY
Thanks for all the help! I cant be anymore thankful, wish I could support you another way then subbing! Lots of great info here! :)
seems to be a common problem, I've done the same!
All this technology and we can’t read oil pressure from the Obd2 port
Hey xCkillaxC,
Since most engines don't have an oil pressure sensor, (they have a oil pressure switch) there is no way to know the actual oil pressure, so....no need for an oil pressure PID.
Now, oil pressure can be inferred from how well the variable cam timing is functioning. If the oil pressure us low, it will take longer for the cam to move to the requested direction.
As enthusiasts, we would love to have this. BUT the main purpose of the OBD port is for emission testing and troubleshooting.
Motorvate DIY Wow still replying on a 3yr old video, what a boss. Yeah man I know it doesn’t work but one could only dream right lol. I’m looking to buy a G37s this month and highly doubt any owner will let me pull out a gauge and check their pressure lol so I guess I’ll just have to take a gamble...
Hey xCkillaxC,
I check and reply to all comments every day. 99% of the time people are asking good questions and I like to do my best to help :)
I don't have any hard data on this, but I don't think the galley gasket issue is very common. The car forums generally make small issues much bigger than they really are.
I think the G37 Sport is a special car. It does so many things very well and looks wonderful! Good luck on what ever you decide!
@@MotorvateDIY Is it galley gasket or gallery gasket? lol Seems everyone calls it something different.
@@bjornironsides6474 In my opinion, they mean the same thing... a passage way for oil to travel.
Does anyone know what the pressure is supposed to be at 5k rpms ?
The Infiniti spec is only listed at idle and 2,000 RPM.
If your engine meets those specs, you are good to go.
One of the greatest engines made if you get a good one. Sounds like yours is purring like a cat, very nice. Great vid, sub'ed!
Hey P Hanley,
I am a long time VQ engine lover, ever since my 95 Maxima.
AND yes, my VQ37VHR running well (so far!)
In a future episode, I will show you how to build (or buy) a Bluetooth oil pressure gauge and use a free app to see your oil pressure.
Thank you for subbing!
@@MotorvateDIY That's great news, I'm looking forward to it!
@@MotorvateDIY did you make that episode yet?
Hey Иван Грозный,
Still working on it. As you can imagine, there are a lot of items that need to be researched and tested.
The oil pressure sensor testing is done, as well as testing how well you can receive an Bluetooth signal from under a metal hood
AND the micro controller programming is done.
The next step is developing the app.
@@MotorvateDIY any update on this? :D
Excellent video.
Will swing by Harbor Freight tomorrow =)
Hey Captain ADHD,
Nice! Just make sure the oil is at 80C/176F when looking at the oil pressure compared to the factory spec.
If you don't have an OBD scanner, but have a volt meter:
• The oil is at 80C/176F when the voltage at the engine oil temperature sensor (while it is connected) is 1.20 - 1.22 volts.
@@MotorvateDIY thANKS my nay nay. can I borrow your gauge?
Hey Иван Грозный,
Sure, just drop by and pick it up :)
@@MotorvateDIY I already bought my own
Great... and now you are all set :)
Thabk you! Amazing video!
Hey Richard Manzanarez,
Thanks!
You might want to subscribe as in a future video I will show how to build your own, inexpensive, digital oil pressure gauge, using an Arduino Uno or Nano. Pre-production should be starting next month :)
i want to buy a 2009 g37x with 63k miles, do you think i’ll have to worry about the galley gasket issue? that’s the only thing worrying me about the car.
also if it were to be repaired, is it possible to break again? as long as it’s the reinforced gasket
As I understand it, the newer gaskets are no longer made of paper and should last.
What would happen if you left the oil pressure switch unplugged permanently in favor of a oil pressure guage full time? I'm trying to avoid an adapter to keep the oem pressure switch? Thoughts?
Hey Christopher Hamilton,
What will happen if you remove the factory oil pressure switch?
Nothing. The "low oil pressure" signal does not go to the ECM, but only to the dash to turn on the "low oil pressure light"
From testing, the "low oil pressure" light is turned on at 4-5 psi, which it VERY low. (I have bench tested my sensor on my G37)
Here is how the low oil pressure switch works: When the oil pressure is below 4-5 PSI, the switch closes and the light in the dash turns on.
If the switch is not there, the low oil pressure light will not turn on, EVER. Which is OK, if you have an oil pressure gauge.
Three days ago, I installed an oil pressure gauge on my G37 and removed the factory oil pressure switch and all is good!
TLDR;
It is fine and I have done the same :)
@@MotorvateDIY awesome. I was going to bother with a t adapter but now I'll not bother with that and go right into the upper pan not bothering with an adapter. Thanks bud! Also cant wait to see the pcv data soon!!
@@MotorvateDIY hey bubba thread tape or sealant?
Anytime :)
What ever you prefer.
The old style teflon tape works well, just make sure to leave about 1/8" of the fitting tip exposed. This prevents any chance of tape getting into the oil system.
A thread sealant also works well and there is no chance of it getting into the oil system, but they do take time to fully cure.
If one had the aem guage is this where we plug into?
Hey James Dean Cooper,
Yes, the oil pressure sensor would screw into the same location as the oil pressure gauge.
Keep in mind, the thread on the engine is a 1/8" BSPT (british standard pipe thread). Most aftermarket pressure sensors are 1/8" NPT (national pipe thread) so you might need an adapter.
Here is one I have used:
www.glowshiftdirect.com/1-8-bspt-male-to-1-8-27-npt-female-thread-adapter/
My g37s coupe not driving like it has 330 bhp....plus I ave a check engine light. So I'm going to get it scan tomorrow. So if it's under 14 psi what u thing is wrong?
Hey Mccoy Henry,
The diagnostic scan won't tell you your oil pressure, that needs to be measured with a gauge.
If the check engine code is VVT (variable vale timing) related, then hook up a gauge to see what pressure you have at idle.
The main cause of low oil pressure on our engines (VQ37) is a split rear timing cover gasket.
This is an expensive repair as most of the front engine needs to be removed to get to it.
Hopefully it's something easier and cheaper to fix.
Thanks man your such a blessing for us G boys n girls out here.
Hey Mccoy Henry,
Thanks!
if you measure i with a manual gauge could be the t oil pump, bad gaily gaskets , oil valve relief, in the worst case could be bad bearings , the stock electronic gauge is not accurate sometimes, the sensor unit can fail
Mine is at 6 psi :/
That sucks.... BUT you caught it in time!
Did you get any codes?
@@MotorvateDIY nope. I had just finished up replacing the o2 upstream sensors. And was feeling like the top end was making too much noise. So i did a pressure check and bam 6 psi. Been like that i want to say for a few months now. No code. And since I am going to be doing a traveling jobs, figured i better look over everything before I'm 1,000 miles from home.
btw got to the galley gaskets today waiting on parts now. But I blew out my top end galley gasket for sure. Got a new oil pump, gaskets, timing chains, tensioners, and water pump on the way. 112k miles. Figured if I'm in there, get all of the major stuff done.
Were all the galley gasket cover screws tight?
@@MotorvateDIY not really. i think i broke them fairly easily
Wow, 0 dislikes
Hey Z Green,
Just wait, I'm sure someone will fix that :)
Dude, you shouldn't be working on cars, let alone showing people the wrong way!!!
Feel free to correct me.