Yes, let's use our personal biases to justify our beliefs based on a RUclips video. "Never attribute to malice what you can attribute to ignorance" - Robert J. Hanlon
I had a new muffler I bought online at local muffler shop and also had a new O2 sensor with me. When welder was done I asked if he could put in O2 sensor since it was a wire and simple screw in one. He did it no additional charge. Not all shops are unfriendly. I have old OBD1 system which is better than the new cars. No driving around for two hours to reset banks.
Then you are misinformed. Just because some dealers can be like that doesn't mean every single one is. Remember Ray was once a dealer tech who I guarantee was just as thorough as he is now.
Who'd have thunk - a malfunctioning PCV valve causing that. VERY interesting diag and thorough as well showing how it's done. I'm continually impressed by your knowledge, and explanations of things. Thank you, Ray! 😊
I bought a mustang has the 302 with the pcv valve on the back of the intake it was pretty much non existent i put one in it an it was almost night an day difference on running
Its not quite a catch all, but with todays engines... always take a moment to check anything rubber [after the MAF sensor] that could be a vacuum leak anytime an engine code gets thrown. Call it parts cannon prevention.
The wave form improved as the oil contamination on the oxygen sensors was burnt off when the correct mixture was reinstated after you fitted the new PCV valve. Very well done diagnosis as you took nothing for granted and used the data to steer your fault finding process.
You give techs a good name. Your diagnostic skills are awesome. I’ve been a tech for 45 years. Not many of us take pride in our work. Due to health issues I started writing service. I had a tech just like you. We got him put on salary and he wanted all the problem jobs. He too is a awesome tech. GREAT JOB SIR
Good job of handling the sound problems and still producing great content for us folks looking over his shoulder! Ray is not only a good mechanic but has a natural gift for presenting informative and entertaining video. Probably why we're all here, huh?
Thank you so much for this video. I probably learned more during this segment than by reading a stack of books on auto mechanics. A very enlightening, clear, and high-quality video!
The only thing I can complain about is, that you don't live around here. I could use your experience and attitude ten times a day. And as usual you learn by watching those videos. Honest and experienced craftmanship. How many other dealers would go so far instead of changing sensors and rip of customers?
I love the candid live talk more than the voice over. but the voice over is good for actual troubleshooting and teaching moments. Working in tech i have a love/hate relationship and understand the frustration of tech that should just work but then craps out for no reason.
Yep, had the same code on a lincoln 3.6. Rough idle, O2 code.. Replaced the purge canister valve and the o2 code went away! Idles much mush smoother. Amazing!
Great diagnostics , I made my own smoke machine with an empty paint can and use my ryobi tire inflator to push the smoke through the vacuum lines, great job!
I've been chasing the same code on a 2002 Subaru Outback. Just replaced the o2's. Codes are back. Thanks to your mechanical knowledge, I will now look for vaccum leaks. Thank you, sir.
In the Subaru, check the PCV valve and the PCV hose (near the throttle body on the passenger side). Change them if they are the least bit sketchy. The PCV hoses on Subarus get cooked and become brittle.
That's no way to go about it. There's no guarantee that the same fix will work for the same codes. You have to diagnose the issue. Emissions codes can't be cleared. When you tell the pcm to clear emissions codes, they don't go away. Their status changes from pending to permanent, and the check engine light goes out. The pcm then monitors the system to determine if the problem is actually fixed, and you didn't just clear the codes. On your car, they went from permanent back to pending because you didn't fix the problem. Your scan tool probably can't read permanent DTC's. Since O2 related dtc's are so generic, its easier to eliminate possibilities than it is to chase each one individually. Bypass your O2 sensors, then monitor the pcm's transition from open to closed loop. Not only will this allow you to eliminate or confirm a vacuum leak, but a bunch of other potential problems all at once.
Don't look over the PCV Valve! You should be able to shake it up and down and it should rattle! And it is a one way check valve! So you should be able to blow through it one way and not the other.
This was a very educational old- school style video. The Javi Air van has made quite a number of appearances on the channel, a nice steady customer. I enjoyed this one a lot.
Man, I wish we weren't 1500 miles apart. You would get all my automotive business! Guess I'll just have to settle for learning a few things from you for when I do it myself or if I do have to take it to a mechanic so we can at least attempt to speak the same language! Rock on, dude!
Found this interesting! 2020 Jetta kept throwing evap codes. From my own research on the 1.4 engine, VW was aware, but would techs simply reprogram per VW SB. Since I diy, I went directly to what VW calls the N80 (purge) valve. They used to sell it separately for $15. Now it’s part of an assembly $90. I get the assembly, cut the hoses and plug the N80 in. Hour researching, $90 out of pocket, 15 min plugging valve into existing hoses. Haven’t had any issues since. The valve was clean. Must have been a batch of valves with bad wiring. Parts department knows me and we had a good laugh about buying the whole assembly and how I fixed the issue. VW still has their techs running in the wrong direction.
I happen to have an upstream bank 1 O2 code. The condition was sudden. Rough idle, stumbling. 1998 3.0 Toyota Sienna 173k. My mechanic dented my rocker lifting my van, then lied to my face. I bought a Denzo OEM sensor and will change it myself, like every other restoration repairs that I DIY better than most parts changers. With the O2 code, the engine runs smooth expect a slight random roughness that a non mechanic would never notice. When I replace the sensor, if my lying ex mechanic installed some cheap crap other than Denso, I am going to make him eat it when several of his customers are present in the morning. My vacuum measures perfect, but I never considered another system valve or the PCV valve. That was a great video.
@ProjectMayhem2025-f1i it's not vacuum. Last year I resealed the top engine oil leaks. Not one hose from the air box to the plenum amazingly had no cracks. My van never saw salt for 18yrs when I paid $2K. The prior 5 owners had the same last name and they all lived in Greenville SC No rust! None. The frame to body mounts still have no cracks and I am on salty Long Island a mile from the LI Sound. My ex mechanic lied to my face. I told him only use the Denso parts that the whole van was manufactured with. I replaced a no name sensor that he installed with the correct Denso OEM non California emissions sensor and the my engine light went off after 15min driving. The California Denso costs $215!🤯 The standard OEM was$ 70 Denso makes a cheaper not OEM sensor $50. I never went half way or cheap rebuilding my marine engines. No tow trucks at sea back then. The only system that I have not upgraded or restored to mechanically new is the AC. I charged it once in 8 years. The hood paint is shot from the 3.0 heating soo close to the hood.
@@keithhults8986 Why waste all that time and money to fire the parts cannon replacing O2 sensors that you don't even know are bad? When your O2 sensors are bypassed, monitor the data stream on your scanner. If the problem occurs when the pcm transitions from open loop to closed loop, then you have an O2 sensor related problem. If nothing changes, look elsewhere. The whole procedure shouldn't take longer than 5 minutes.
@052RC Because my mechanic said he replaced a Denso sensor with a cheap sensor that Toyota ECM's reject! I forgot to mention, he also dented my rocker panel and missed the jack support by two inches! With a perfect circular dent the exact size as his lift arm cup!🤬 My 26yr old 100% DIY perfect running van was dentless, and rustless until Jay at Global Motorcar put the 1st F-ing dent in my van! I'M 66 and been wrenching rebuilding outboards, Indmar ski boat inboards, Deisels, and outdrives since since I walk into my stepfather's oil fleet truck shop since 1968 12yrs old. I ran 8 service vans, E250 C10, GMC Savanah etc into the ground and do all my own work 1st shot, every time! That's what I get for trusting a mechanic.
Thanks for doing the audio fill in and not trashing the video. And I wanted to let you know when the scan tool ask if vehicle has AC, it means form the factory, not the job description. That was FUNNY!!!
I have a 2010 GMC Yukon Denali with the 6.2L. I had a similar problem. The PCV was introducing oil and other nasty stuff into the intake manifold. It took the premium fuel and rendered it no more than 87 octane. All the oil and contaminants would end up lowering the power and fuel economy. I installed a catch can between the PCV and the top of the intake with a one way check valve. Took a little time for the engine to adjust to the cleaner air. Now I get much better gas mileage and the engine runs smoothly. I empty the can every few thousand miles. What comes out is very nasty. For my truck it really helped.
Just a FYI there is a new and improved valve cover for the driver's side that addresses the PCV problems. Well, that's what was said on a GM truck forum. Not sure if it pertains to the 6.2 as I have a 5.3. (2007 Silverado LTZ) GM service bulletin 10-06-01-008f. There are a bunch of these bulletins that have the same number but end in different letter. A google search "GM service bulletin 10-06-01-008" should get you to some forum threads. I fact the first one is from the Yukon forum( I put F at the end of the number as that's the bulletin I have )
@@FeartheWraith GM has had some really screwy issues with the newer engines and transmissions....Two friends of mine have ongoing problems with their 2022 and 2023 K-1500 p/u .....Engine driveability issues and erattic transmission / vibration and unexpected downshifts in normal drive mode which the dealers cannot seem to diagnose and repair.....Almost like GM WANTS to go out of business....I used 'ta be a devout GM guy, not so much anymore....I now own a nice 2022 Ford F-250 4x4, 6.6 Turbodiesel, 6.5 ft bed, extended cab....best truck I ever owned, save for my 1975 K5 Blazer.. 34,000 original miles and still in factory new condition... Just purchased a Late Production 2023 Bronco 4 door Badlands, Kick Ass 4x4...No more GM (s)crap for me...
The simple mechanical things that have been on vehicles since before electronics can still present a problem on today's sophisticated engines, nice troubleshooting as usual!
Fuel trims are always a trouble for me to find the issue so this gives me some ideas and knowledge. I do not expect an answer in YT comments but i had to decline fixing a 2011 sienna that has long fuel at +10% ------ short fuel at -20% and the tail pipe is jet black........ fun part is it runs quite well but the short fuel trim pid on the scanner blips to a flat 0.000 semi randomly every 10-20 seconds. It was beyond my level hence why i declined but it is stuck in the back of my mind lol. either way always seem to learn something from your vids so keep it up Mr Ray.
not straight OL some times it will do OLDrive most times it stays CL ----- most recent drive with no work done and it now runs +20 ish short fuel and +28~ long fuel. the long fuel does also jump around ALOT like every 15 seconds ranges anywhere from +19-30 and short is just having a field day sitting at idle will drop to +3 then jump to +20 all while in CL --- will also stay in CL 23% throttle and drop short to the 0.000. Im sure some of this is the eco mode stuff and im just being outpaced by the overcomplicated tech lol
Blowby gasses also have vaporized fuel, so I like your theory regarding why a stuck open PCV would cause a rich condition. Nice catch. I though you were following the wrong pathway with the smoke test, but in the end you found something I might have missed.
I would definitely go to this men’s repair shop if I was in his town! Honesty goes a long way, I have been watching his videos for some years now and he’s definitely an honest professional mechanic!
Excellent diagnostic knowledge put into plain easy to understand terms us newbies can enjoy. I watched it all and learnt heaps. Many thanks. I'll encourage my son to watch this he just started as Ford as an apprentice automotive technician.
Nice to see that you actually addressed the PC. issue. So often today the PCV system is overlooked and seldom serviced. I see vehicles with over 100, 000 miles and the PCB valve has never been changed (I only use OEM valves, unless I see an issue like you did. Nice diag Ray!
I don't know what's worse, old school where you would simply replace the PCV valve hoping that was the only issue or spending hours using the diagnostic reader, checking all vacuums with smoke. I actually like the idea of doing the extensive check. I just don't like having to spend the extra money. What a dilemma, cost vs accuracy. Great job done in this video showing all the possibilities. Two thumbs up
@2:10 Learned a new word today! Stoichiometric - a branch of chemistry that deals with the application of the laws of definite proportions and of the conservation of mass and energy to chemical activity. Because very lean combustion is cooler than a stoichiometric reaction (where λ=1 and there is exactly enough air to completely burn each molecule of fuel but no more), less energy is wasted as heat.
As an ex mechanic myself, your diagnosis was perfect. I could tell you a lot of stories where miss diagnosis meant money and time waisted and customer dissatisfaction. Well done and thanks for sharing. Subscribed and liked
I love the Ray approach to fault finding. You kinda know what it us, but you still eliminate the other potential causes as part of the diag. Parts ate not fired at the thing until a clear target is found. Good job!
Well done sir. I have run into the same problem and on different types of vehicles. Not only have I found faulty PVC valves but also failed PVC grommets on valve covers that don't seal well and let air in past the loose fit. You are a great problem solver and your video is a wealth of knowledge for folks who may need a little help with similar problems. It teaches how to think through the functioning of systems to locate the source of the problem!!
"I'm wasting my time with the smoke since I don't think it has an air leak." Finds air leak. Great video Ray on why you always check everything and don't make assumptions.
About the noise, I've used a simple no electronics type Stethoscope with a solid wand to find vibrations. Stethoscopes for heart & lung sounds use a diaphragms & can hear sounds. Some small amounts of vibrations leak through as well. You can buy smartphone electronic wands to detect sounds that have sensors. However, Stethoscopes don't require batteries. This was a really great video.
This is a very interesting video. There could be a multitude if problems each with its own solution. Ray's troubleshooting as always is flawless. It takes a keen ear to catch the faulty part with the engine running plus all the background noises.
This is why I love this guy ! He doesn't do the oh it's just this change the part and say yup what ever, he actually cared about the vehicles that he works on and does the actual " proper mechanic " does his job 🤬🤬🤬🤬ING right and moves forward, yes a lil more work but at least he dam honest about it ! The old school mechanics know things by sound and touch which can be a pain but sometimes faster sometimes slower, but once I heard that rapping noise I new the EGR valve was toast, but in some cases sometimes not just the only issue so great job checking all the lines and again thank you for showing how a REAL mechanic and an HONEST shop does things ! Thank you
I have the 4.6 and I heard the same noise when diagnosing a bad intake gasket, but it doesn't do it all the time and the oil was low with no leaks. It was also sounding like rattling bearings but now I think it was lean popping or missing really hard from the water on the top of the motor.Thanks for the learning lesson.
I’ve learned an incredible amount of information from you and I appreciate that however…. I’ve spent a lot of money on tools and equipment thanks to you 😀 your teaching methods and explanations are easy to follow even for me.not the sharpest knife in the drawer. Just a simple thank you for sharing your talent
Thanks for all your work on the video - with the audio the work to have a good production was notable and appreciated. Not unlike in the roles I was in - when things are going well, people do not notice the work involved to have it that way. Enjoy your work and skill - it keeps my brain happy in a manner.
Great catch. I was always taught to change the air filter, change the pcv valve. On my 5.3L it's only like $15 I think I remember, so no pain there. Never understood exactly why, but you just gave me that answer. Cool. Hope your new year is heading up UP UP. Cheers.
Ray Thank You for giving us the fuel trim explanation. Lean Codes sometimes are very difficult to find even with smoke machines. I know, I've been chasing high fuel trims due to small vacuum leaks. Hopefully I finally found it.😊
I don't know why I keep coming back here i don't even own any of these damn cars lol but it's fun to watch and you make it fun to learn this, not a car person but you have helped me understand how a car function, thank you! really 😭
That was a pretty amazing video. So many things in your job can be done wrong. It’s really fascinating to watch you diagnose a problem. Thanks for sharing this, Ray!
My Dad had the oil changed in his Mercury and on the way home got the Check Engine light and called me to come and look at it. O2's had set lean codes which for sure would have cost him sensors with many mechanics...but I knew the car ran fine and his 'Change Oil' monitor had gone off several times because it was time based and the car didn't get driven much. Oil was still clean as new so I just reset the monitor and sent him on his way. Well...the O2's got used to seeing the fuel dilution in the oil and with fresh thought something had gone wrong so they set the warning. Cleared codes and no more problems. Don't just replace parts people!!! Understand what the codes are telling you and why....then verify with live data and save yourself a lot of money.
Got to thank you. I have ,06 Ford E-350 van, 5.4 3 valve. Mech told me engine rebuild time (239k miles). Asked him to replace the PVC assembly. Bingo same results as van you had. You saved me, Much to mech sagrin, an engine rebuild since no smoke. Great compression and quiet engine. Many thanks..
Point about the O2 sensor graphs - the output signal varies quite quickly, about 20 cycles per second, so the slow scan on your scan tool will show the max/min values well, but not the actual waveform, and the occasional nulls are due to aliasing. You need a faster scanner or an oscilloscope connected directly to the sensor to get a true waveform.
Excellent work and just goes to show how everything works together and if one piece works incorrectly it screws up other readings ! Nicely explained, thanks 🙏🏻
I consider myself pretty good diagnostician and I’ll admit, it would have taken me quite a while to figure out the pcv valve was causing it. Well maybe with audible giveaway (the bad valve buzzing), but still , tough one. So my hats off to you sir 👍🏻👍🏻!!!!!
Interesting, thanks for this. To me this says that the Oxigen sensors are quite accurate and much more accurate than I imagined they are, I am old schooled regarding these things.
Really interesting to watch Ray, I came out of the job around 25 years ago when all this crap was just coming in and I'm getting lost when I look at motors these days.
Almost 6 minutes in and after seeing the fuel trims plus it being 2 sensors before the cats, I'm going to go clean the MASS or MAF and see if that cures its ills. That would be my first guess at this point. A FEW MOMENTS LATER. Should have scrolled through the comments. One such comments actually includes your diagnosis and that it was correct; the PCV. That one would have taken me a while to get to. From many of the other comments I can assume though that you're a good teacher. So definetly looking forward on how you came to that conclusion. Also,I'm not a mechanic. Well, certainly not certified, but I could never afford a car if I had to pay a mechanic to work on mine, so I like to learn from mechanics and of course getting my own hands dirty.
Great video, I appreciate how you patiently diagnose, check, explain and fix the real problem. Would be very unlikely to have 2 broken oxygen sensors, as you stated. You don't throw in unnecessary parts like some shops/dealers do... Throwing customers coins in a coin pusher machine. I wonder what oil consumption like that does to the cats? (meow) And do they burn themselves clean now the oil consumption is taken away?
Mechanics load up the parts cannons and effectively total most older vehicles with issues, and here I am in my garage, actually doing thorough diagnostics on my Fords using my IDS, oscilloscope, multimeters, AllData, smoke machine, compression tester, vac/pressure gauges and all that other crap, and I actually don't end up buying that many parts most of the time. I also love to get parts from the pick n pull as long as they're not wear parts. Working on your own stuff sure is fun, and you learn a whole lot.
Excellent video. Very educational for me. I like your systematic approach. It would be so easy to throw some 02 sensors at it and have the customer come back in a couple weeks with same complaint and more oil consumption. I wonder if all that oil burning caused the Bank 1 o2 sensor to become slightly contaminated?
Thank for sharing Ray, I have a E150 2005 4.6l with a similar issue when looking at the O2 sensors graph, will copy cat your procedure to determine the posible problems, when I press the brake pedal you can hear a leak, there may be some other leaks as well. My van has a lift since I am a handicap. Greetings from Panama 🇵🇦. If you ever come here, you and your wife are invited by my wife and me to a dinner. Take care!
The 4.6ls (and 5.4s) had massive issues with upper intakes leaks and people not replacing the damn PCV which caused a blockage of oil/fuel build up in the throttle valve/idle air control. id start there
I do not think ANY stealership would have bothered to carry out such a thorough diagnosis.
Well done Ray.
Stealership, priceless.
Yes, let's use our personal biases to justify our beliefs based on a RUclips video. "Never attribute to malice what you can attribute to ignorance" - Robert J. Hanlon
I had a new muffler I bought online at local muffler shop and also had a new O2 sensor with me. When welder was done I asked if he could put in O2 sensor since it was a wire and simple screw in one. He did it no additional charge. Not all shops are unfriendly. I have old OBD1 system which is better than the new cars. No driving around for two hours to reset banks.
Then you are misinformed. Just because some dealers can be like that doesn't mean every single one is. Remember Ray was once a dealer tech who I guarantee was just as thorough as he is now.
@owencocchio1716, and you notice he left because that's not the buisness model they work under!
Who'd have thunk - a malfunctioning PCV valve causing that. VERY interesting diag and thorough as well showing how it's done. I'm continually impressed by your knowledge, and explanations of things. Thank you, Ray! 😊
I bought a mustang has the 302 with the pcv valve on the back of the intake it was pretty much non existent i put one in it an it was almost night an day difference on running
Its not quite a catch all, but with todays engines... always take a moment to check anything rubber [after the MAF sensor] that could be a vacuum leak anytime an engine code gets thrown. Call it parts cannon prevention.
Once he ruled out the Evap system I called it before he actually found the problem. My first place to look was Evap canister second was PCV
The wave form improved as the oil contamination on the oxygen sensors was burnt off when the correct mixture was reinstated after you fitted the new PCV valve. Very well done diagnosis as you took nothing for granted and used the data to steer your fault finding process.
This is why I started following years ago. Ray is the Columbo of diagnostics.
Yup, one more question. 🙋♂️
@@turdferguson6648 I prefer Sherlock, but Yes he is one clever mechanic😎
Even as a mechanic I really have a lot of respect for this guy.
Another honest Ray. You saved this man lots of money.
Your a God send.
That's why you have a lot of customers
You give techs a good name. Your diagnostic skills are awesome. I’ve been a tech for 45 years. Not many of us take pride in our work. Due to health issues I started writing service. I had a tech just like you. We got him put on salary and he wanted all the problem jobs. He too is a awesome tech. GREAT JOB SIR
Good job of handling the sound problems and still producing great content for us folks looking over his shoulder! Ray is not only a good mechanic but has a natural gift for presenting informative and entertaining video. Probably why we're all here, huh?
I love what you are doing mat
We're all here because we're not all there. We should all know that by now.🤣😋
Ray has become the “vacuum whisperer”. None can rival his ability to find and fix.
Car Whisperer.....
Así como el Sr, O. encuentra corrosión verde en los cables. 😄
The best one handed mechanic
Thank you so much for this video. I probably learned more during this segment than by reading a stack of books on auto mechanics. A very enlightening, clear, and high-quality video!
Outstanding job!
I would’ve never imagined the PCV vapor could be a source of fuel, but it does make sense.
Thanks for sharing your wisdom with us!
The only thing I can complain about is, that you don't live around here.
I could use your experience and attitude ten times a day. And as usual you learn by watching those videos. Honest and experienced craftmanship.
How many other dealers would go so far instead of changing sensors and rip of customers?
I love the candid live talk more than the voice over. but the voice over is good for actual troubleshooting and teaching moments. Working in tech i have a love/hate relationship and understand the frustration of tech that should just work but then craps out for no reason.
I wish independent auto shops had an organization allowing consumers to find reliable, honest shops nearby. From AZ.
Yep, had the same code on a lincoln 3.6. Rough idle, O2 code.. Replaced the purge canister valve and the o2 code went away! Idles much mush smoother. Amazing!
Knowing the history (recent oil add) was important in this diagnosis. Thanks for the diagnostic lesson!
Great diagnostics , I made my own smoke machine with an empty paint can and use my ryobi tire inflator to push the smoke through the vacuum lines, great job!
I've been chasing the same code on a 2002 Subaru Outback. Just replaced the o2's. Codes are back. Thanks to your mechanical knowledge, I will now look for vaccum leaks. Thank you, sir.
In the Subaru, check the PCV valve and the PCV hose (near the throttle body on the passenger side). Change them if they are the least bit sketchy. The PCV hoses on Subarus get cooked and become brittle.
Had similar problem with 2005 Baja for 2 year no shop figured it out...I found the vacuum line to break boost on the intake loose 😊
@@pdxRetired tbh so do BMW ones
That's no way to go about it. There's no guarantee that the same fix will work for the same codes. You have to diagnose the issue. Emissions codes can't be cleared. When you tell the pcm to clear emissions codes, they don't go away. Their status changes from pending to permanent, and the check engine light goes out. The pcm then monitors the system to determine if the problem is actually fixed, and you didn't just clear the codes. On your car, they went from permanent back to pending because you didn't fix the problem. Your scan tool probably can't read permanent DTC's.
Since O2 related dtc's are so generic, its easier to eliminate possibilities than it is to chase each one individually. Bypass your O2 sensors, then monitor the pcm's transition from open to closed loop. Not only will this allow you to eliminate or confirm a vacuum leak, but a bunch of other potential problems all at once.
Don't look over the PCV Valve! You should be able to shake it up and down and it should rattle! And it is a one way check valve! So you should be able to blow through it one way and not the other.
Once again, Ray completely diagnosed an issue with an engine system. He often diagnoses electrical problems with the same fine tooth comb. 😵💫😃
This was a very educational old- school style video. The Javi Air van has made quite a number of appearances on the channel, a nice steady customer. I enjoyed this one a lot.
Man, I wish we weren't 1500 miles apart. You would get all my automotive business! Guess I'll just have to settle for learning a few things from you for when I do it myself or if I do have to take it to a mechanic so we can at least attempt to speak the same language! Rock on, dude!
Yup. Same here.
This is why I watch your channel Ray. Detailed explanations with visuals. Oh and please keep us up to date about the oil consumption issue.
Found this interesting! 2020 Jetta kept throwing evap codes. From my own research on the 1.4 engine, VW was aware, but would techs simply reprogram per VW SB. Since I diy, I went directly to what VW calls the N80 (purge) valve. They used to sell it separately for $15. Now it’s part of an assembly $90. I get the assembly, cut the hoses and plug the N80 in. Hour researching, $90 out of pocket, 15 min plugging valve into existing hoses. Haven’t had any issues since. The valve was clean. Must have been a batch of valves with bad wiring. Parts department knows me and we had a good laugh about buying the whole assembly and how I fixed the issue. VW still has their techs running in the wrong direction.
I happen to have an upstream bank 1 O2 code. The condition was sudden. Rough idle, stumbling. 1998 3.0 Toyota Sienna 173k. My mechanic dented my rocker lifting my van, then lied to my face. I bought a Denzo OEM sensor and will change it myself, like every other restoration repairs that I DIY better than most parts changers. With the O2 code, the engine runs smooth expect a slight random roughness that a non mechanic would never notice. When I replace the sensor, if my lying ex mechanic installed some cheap crap other than Denso, I am going to make him eat it when several of his customers are present in the morning. My vacuum measures perfect, but I never considered another system valve or the PCV valve. That was a great video.
I bet it's not even a sensor problem. Btw I hate when reply to being dick is being bigger dick.
98? I'd look for vacuum leaks with a smoke machine first before replacing parts
@ProjectMayhem2025-f1i it's not vacuum. Last year I resealed the top engine oil leaks. Not one hose from the air box to the plenum amazingly had no cracks. My van never saw salt for 18yrs when I paid $2K. The prior 5 owners had the same last name and they all lived in Greenville SC No rust! None. The frame to body mounts still have no cracks and I am on salty Long Island a mile from the LI Sound. My ex mechanic lied to my face. I told him only use the Denso parts that the whole van was manufactured with. I replaced a no name sensor that he installed with the correct Denso OEM non California emissions sensor and the my engine light went off after 15min driving. The California Denso costs $215!🤯 The standard OEM was$ 70 Denso makes a cheaper not OEM sensor $50. I never went half way or cheap rebuilding my marine engines. No tow trucks at sea back then. The only system that I have not upgraded or restored to mechanically new is the AC. I charged it once in 8 years. The hood paint is shot from the 3.0 heating soo close to the hood.
@@keithhults8986 Why waste all that time and money to fire the parts cannon replacing O2 sensors that you don't even know are bad? When your O2 sensors are bypassed, monitor the data stream on your scanner. If the problem occurs when the pcm transitions from open loop to closed loop, then you have an O2 sensor related problem. If nothing changes, look elsewhere. The whole procedure shouldn't take longer than 5 minutes.
@052RC Because my mechanic said he replaced a Denso sensor with a cheap sensor that Toyota ECM's reject! I forgot to mention, he also dented my rocker panel and missed the jack support by two inches! With a perfect circular dent the exact size as his lift arm cup!🤬 My 26yr old 100% DIY perfect running van was dentless, and rustless until Jay at Global Motorcar put the 1st F-ing dent in my van! I'M 66 and been wrenching rebuilding outboards, Indmar ski boat inboards, Deisels, and outdrives since since I walk into my stepfather's oil fleet truck shop since 1968 12yrs old. I ran 8 service vans, E250 C10, GMC Savanah etc into the ground and do all my own work 1st shot, every time! That's what I get for trusting a mechanic.
Thanks for doing the audio fill in and not trashing the video. And I wanted to let you know when the scan tool ask if vehicle has AC, it means form the factory, not the job description. That was FUNNY!!!
I have a 2010 GMC Yukon Denali with the 6.2L. I had a similar problem. The PCV was introducing oil and other nasty stuff into the intake manifold. It took the premium fuel and rendered it no more than 87 octane. All the oil and contaminants would end up lowering the power and fuel economy. I installed a catch can between the PCV and the top of the intake with a one way check valve. Took a little time for the engine to adjust to the cleaner air. Now I get much better gas mileage and the engine runs smoothly. I empty the can every few thousand miles. What comes out is very nasty. For my truck it really helped.
Just a FYI there is a new and improved valve cover for the driver's side that addresses the PCV problems. Well, that's what was said on a GM truck forum. Not sure if it pertains to the 6.2 as I have a 5.3. (2007 Silverado LTZ) GM service bulletin 10-06-01-008f. There are a bunch of these bulletins that have the same number but end in different letter. A google search "GM service bulletin 10-06-01-008" should get you to some forum threads. I fact the first one is from the Yukon forum( I put F at the end of the number as that's the bulletin I have )
@ Thx
@@FeartheWraith GM has had some really screwy issues with the newer engines and transmissions....Two friends of mine have ongoing problems with their 2022 and 2023 K-1500 p/u .....Engine driveability issues and erattic transmission / vibration and unexpected downshifts in normal drive mode which the dealers cannot seem to diagnose and repair.....Almost like GM WANTS to go out of business....I used 'ta be a devout GM guy, not so much anymore....I now own a nice 2022 Ford F-250 4x4, 6.6 Turbodiesel, 6.5 ft bed, extended cab....best truck I ever owned, save for my 1975 K5 Blazer.. 34,000 original miles and still in factory new condition... Just purchased a Late Production 2023 Bronco 4 door Badlands, Kick Ass 4x4...No more GM (s)crap for me...
The simple mechanical things that have been on vehicles since before electronics can still present a problem on today's sophisticated engines, nice troubleshooting as usual!
Fuel trims are always a trouble for me to find the issue so this gives me some ideas and knowledge. I do not expect an answer in YT comments but i had to decline fixing a 2011 sienna that has long fuel at +10% ------ short fuel at -20% and the tail pipe is jet black........ fun part is it runs quite well but the short fuel trim pid on the scanner blips to a flat 0.000 semi randomly every 10-20 seconds. It was beyond my level hence why i declined but it is stuck in the back of my mind lol. either way always seem to learn something from your vids so keep it up Mr Ray.
Is it going open loop when the fuel trim goes to 0.000???
not straight OL some times it will do OLDrive most times it stays CL ----- most recent drive with no work done and it now runs +20 ish short fuel and +28~ long fuel. the long fuel does also jump around ALOT like every 15 seconds ranges anywhere from +19-30 and short is just having a field day sitting at idle will drop to +3 then jump to +20 all while in CL --- will also stay in CL 23% throttle and drop short to the 0.000. Im sure some of this is the eco mode stuff and im just being outpaced by the overcomplicated tech lol
Old school diagnostician with new school tools! Well done sir!
Blowby gasses also have vaporized fuel, so I like your theory regarding why a stuck open PCV would cause a rich condition. Nice catch. I though you were following the wrong pathway with the smoke test, but in the end you found something I might have missed.
Another great diagnostic video. Thanks for the detailed explanations. George from Indiana
I would definitely go to this men’s repair shop if I was in his town! Honesty goes a long way, I have been watching his videos for some years now and he’s definitely an honest professional mechanic!
Excellent diagnostic knowledge put into plain easy to understand terms us newbies can enjoy. I watched it all and learnt heaps. Many thanks. I'll encourage my son to watch this he just started as Ford as an apprentice automotive technician.
Nice to see that you actually addressed the PC. issue. So often today the PCV system is overlooked and seldom serviced. I see vehicles with over 100, 000 miles and the PCB valve has never been changed (I only use OEM valves, unless I see an issue like you did. Nice diag Ray!
I don't know what's worse, old school where you would simply replace the PCV valve hoping that was the only issue or spending hours using the diagnostic reader, checking all vacuums with smoke.
I actually like the idea of doing the extensive check. I just don't like having to spend the extra money.
What a dilemma, cost vs accuracy.
Great job done in this video showing all the possibilities.
Two thumbs up
@2:10 Learned a new word today!
Stoichiometric - a branch of chemistry that deals with the application of the laws of definite proportions and of the conservation of mass and energy to chemical activity.
Because very lean combustion is cooler than a stoichiometric reaction (where λ=1 and there is exactly enough air to completely burn each molecule of fuel but no more), less energy is wasted as heat.
As an ex mechanic myself, your diagnosis was perfect. I could tell you a lot of stories where miss diagnosis meant money and time waisted and customer dissatisfaction. Well done and thanks for sharing. Subscribed and liked
I love the Ray approach to fault finding. You kinda know what it us, but you still eliminate the other potential causes as part of the diag. Parts ate not fired at the thing until a clear target is found. Good job!
Well done sir. I have run into the same problem and on different types of vehicles. Not only have I found faulty PVC valves but also failed PVC grommets on valve covers that don't seal well and let air in past the loose fit.
You are a great problem solver and your video is a wealth of knowledge for folks who may need a little help with similar problems. It teaches how to think through the functioning of systems to locate the source of the problem!!
"I'm wasting my time with the smoke since I don't think it has an air leak."
Finds air leak.
Great video Ray on why you always check everything and don't make assumptions.
I am in awe of your diagnostic skills.
About the noise, I've used a simple no electronics type Stethoscope with a solid wand to find vibrations. Stethoscopes for heart & lung sounds use a diaphragms & can hear sounds. Some small amounts of vibrations leak through as well. You can buy smartphone electronic wands to detect sounds that have sensors. However, Stethoscopes don't require batteries. This was a really great video.
This is a very interesting video. There could be a multitude if problems each with its own solution. Ray's troubleshooting as always is flawless. It takes a keen ear to catch the faulty part with the engine running plus all the background noises.
This is why I love this guy ! He doesn't do the oh it's just this change the part and say yup what ever, he actually cared about the vehicles that he works on and does the actual " proper mechanic " does his job 🤬🤬🤬🤬ING right and moves forward, yes a lil more work but at least he dam honest about it ! The old school mechanics know things by sound and touch which can be a pain but sometimes faster sometimes slower, but once I heard that rapping noise I new the EGR valve was toast, but in some cases sometimes not just the only issue so great job checking all the lines and again thank you for showing how a REAL mechanic and an HONEST shop does things ! Thank you
I have the 4.6 and I heard the same noise when diagnosing a bad intake gasket, but it doesn't do it all the time and the oil was low with no leaks. It was also sounding like rattling bearings but now I think it was lean popping or missing really hard from the water on the top of the motor.Thanks for the learning lesson.
I’ve learned an incredible amount of information from you and I appreciate that however…. I’ve spent a lot of money on tools and equipment thanks to you 😀 your teaching methods and explanations are easy to follow even for me.not the sharpest knife in the drawer. Just a simple thank you for sharing your talent
Thanks for all your work on the video - with the audio the work to have a good production was notable and appreciated. Not unlike in the roles I was in - when things are going well, people do not notice the work involved to have it that way. Enjoy your work and skill - it keeps my brain happy in a manner.
Great catch. I was always taught to change the air filter, change the pcv valve. On my 5.3L it's only like $15 I think I remember, so no pain there. Never understood exactly why, but you just gave me that answer. Cool. Hope your new year is heading up UP UP. Cheers.
Fantastic job well done. People or customers don’t appreciate the hard work to fix cars that takes knowledge and pride in your work.
Ray Thank You for giving us the fuel trim explanation. Lean Codes sometimes are very difficult to find even with smoke machines. I know, I've been chasing high fuel trims due to small vacuum leaks. Hopefully I finally found it.😊
Well done not many people would have diagnosed that. You know your stuff Ray.😊
I feel like the channel could be called the 1 armed mechanic 😂
“On the other hand.” Lefty’s Legacy.
There’s already one of those. He really has one arm and works on tractors.
I don't know why I keep coming back here i don't even own any of these damn cars lol but it's fun to watch and you make it fun to learn this, not a car person but you have helped me understand how a car function, thank you! really 😭
What a GREAT video and diagnosis! Didn't let ANYTHING slip by without checking it. Happy New Year to you and your family sir!
That was a pretty amazing video. So many things in your job can be done wrong. It’s really fascinating to watch you diagnose a problem. Thanks for sharing this, Ray!
My Dad had the oil changed in his Mercury and on the way home got the Check Engine light and called me to come and look at it. O2's had set lean codes which for sure would have cost him sensors with many mechanics...but I knew the car ran fine and his 'Change Oil' monitor had gone off several times because it was time based and the car didn't get driven much. Oil was still clean as new so I just reset the monitor and sent him on his way. Well...the O2's got used to seeing the fuel dilution in the oil and with fresh thought something had gone wrong so they set the warning. Cleared codes and no more problems.
Don't just replace parts people!!! Understand what the codes are telling you and why....then verify with live data and save yourself a lot of money.
Nice find with the PCV valve
Ray doing things and stuffs correctly as always.
Very good and interesting diagnosis, I was leaning to blow-by but now learned to check everything before jumping to conclusions.
Got to thank you. I have ,06 Ford E-350 van, 5.4 3 valve. Mech told me engine rebuild time (239k miles). Asked him to replace the PVC assembly. Bingo same results as van you had. You saved me, Much to mech sagrin, an engine rebuild since no smoke. Great compression and quiet engine.
Many thanks..
Excellent vid on Fuel Trims, Vacuum and O2 sensors. Excellent!!! Thank you.
You are the best. Too bad there are not more technicians as diligent as you. God bless you!
So in essence it was a vacuum leak. Well done Ray. Persistent and common sense
I'm continually impressed by your knowledge, and explanations of things. Thank you, Ray!
Hey Ray, as always I really enjoy your diag skills and you explaining your thought processes through it. Cheers!
Point about the O2 sensor graphs - the output signal varies quite quickly, about 20 cycles per second, so the slow scan on your scan tool will show the max/min values well, but not the actual waveform, and the occasional nulls are due to aliasing. You need a faster scanner or an oscilloscope connected directly to the sensor to get a true waveform.
Best explanation of fuel trim I've heard
Excellent work and just goes to show how everything works together and if one piece works incorrectly it screws up other readings ! Nicely explained, thanks 🙏🏻
i learn so much by watching your videos....thank you for all you do.
Wow... I wish I was your neighbour 😊 but I'm not from your country. You are better than most doctors 👍👍
I consider myself pretty good diagnostician and I’ll admit, it would have taken me quite a while to figure out the pcv valve was causing it. Well maybe with audible giveaway (the bad valve buzzing), but still , tough one. So my hats off to you sir 👍🏻👍🏻!!!!!
A very in-depth and interesting differential diagnosis. Thank for the class.
TY! Glad you enjoyed this one!
Great DiagRay, and you saved the customer a lot of money.
Interesting, thanks for this. To me this says that the Oxigen sensors are quite accurate and much more accurate than I imagined they are, I am old schooled regarding these things.
Really interesting to watch Ray, I came out of the job around 25 years ago when all this crap was just coming in and I'm getting lost when I look at motors these days.
I only wish we lived closer to each other. Good job Ray.
Almost 6 minutes in and after seeing the fuel trims plus it being 2 sensors before the cats, I'm going to go clean the MASS or MAF and see if that cures its ills. That would be my first guess at this point. A FEW MOMENTS LATER. Should have scrolled through the comments. One such comments actually includes your diagnosis and that it was correct; the PCV. That one would have taken me a while to get to. From many of the other comments I can assume though that you're a good teacher. So definetly looking forward on how you came to that conclusion.
Also,I'm not a mechanic. Well, certainly not certified, but I could never afford a car if I had to pay a mechanic to work on mine, so I like to learn from mechanics and of course getting my own hands dirty.
Great video, I appreciate how you patiently diagnose, check, explain and fix the real problem.
Would be very unlikely to have 2 broken oxygen sensors, as you stated.
You don't throw in unnecessary parts like some shops/dealers do...
Throwing customers coins in a coin pusher machine.
I wonder what oil consumption like that does to the cats? (meow)
And do they burn themselves clean now the oil consumption is taken away?
I completely followed your diagnosis and discovery. Very impressive. You are a mechanical God
Excellent work and Thank-you for showing content and showing it in a pro manner
Good job, never would've thought a bad pcv would cause this. And extra points for an actual smoke test
1. Another interesting diagnosis 2. What a state to send any vehicle to you for repair!
Ray- you are a dedicated clinician !!😀
Another one where you did the job right. Thank you for your contribution to mechanical service excellence.🎉
Worn-out/split vacuum hoses are quite common on older Fords, usually from the PCV valve to intake, or EGR valve to intake hoses.
Thank You. Really appreciate the time you spend on the tutorial. Great teacher!!!
Congratulations for this diagnosis! Parabéns pelo excelente diagnóstico Ray!
Mechanics load up the parts cannons and effectively total most older vehicles with issues, and here I am in my garage, actually doing thorough diagnostics on my Fords using my IDS, oscilloscope, multimeters, AllData, smoke machine, compression tester, vac/pressure gauges and all that other crap, and I actually don't end up buying that many parts most of the time. I also love to get parts from the pick n pull as long as they're not wear parts. Working on your own stuff sure is fun, and you learn a whole lot.
I have learned so much from you. I think i know whats wrong with my 4runner now. Thanks!
Man I miss 70s and earlier cars. Much easy to work on. My hats off to you sir.
Excellent diagnosis.. Very logical and well explained. Thanks.
Excellent video! Troubleshooting process so valuable!
Excellent video. Very educational for me. I like your systematic approach. It would be so easy to throw some 02 sensors at it and have the customer come back in a couple weeks with same complaint and more oil consumption. I wonder if all that oil burning caused the Bank 1 o2 sensor to become slightly contaminated?
Good job Sherlock. Love when you dont give up but chases the root cause. 👍
Thank for sharing Ray, I have a E150 2005 4.6l with a similar issue when looking at the O2 sensors graph, will copy cat your procedure to determine the posible problems, when I press the brake pedal you can hear a leak, there may be some other leaks as well. My van has a lift since I am a handicap. Greetings from Panama 🇵🇦. If you ever come here, you and your wife are invited by my wife and me to a dinner. Take care!
The 4.6ls (and 5.4s) had massive issues with upper intakes leaks and people not replacing the damn PCV which caused a blockage of oil/fuel build up in the throttle valve/idle air control.
id start there
@ thanks!
as always well done Ray! we need more people like you!
The most informative video I've seen in Awhile.. Excellent 👍
Ray know his way around engines that's for sure.
Thanks for explaining things so well! You've been really helpful Ray
At 24.30 I was hollering at you. To tell you left a vacuum hose off. But I guess you didn’t hear me😅 good job Ray .