Learn how IMPORTANT the PCV Valve is and why you should test it.
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- Опубликовано: 26 июл 2020
- Quick EZ Test of the PCV System. Positive Crankcase Ventilation / Prevent Oil Leaks / Clean your Oil / Save the planet Earth / Save your car
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You are a great communicator.
The number of times that you said the same thing burned it into my brain!!!
Thank you for the view and that awesome comment. Some views don't like the way I repeat myself. It comes from being an instructor for 40 years. Thank you again.
@@theoldmecanicoshow9004 You should have repeated yourself in the comments...rookie move. lol (jk)
I have been a mechanic all my life and I never knew this trick I love learning every day thanks !
That's Great. Thank you for the view and the comment. Did you see my series of videos on automotive AC ?
@@theoldmecanicoshow9004 I will thanks
The old school hot rodders used crankcase ventilation. Something very similar to the PCV concept, to get more horsepower. A 3/8 pipe cut at a 45-degree angle; the longest part of that angle pointed towards the front of the car. Welded into the header collector. A 90-degree elbow with a check valve and hose leading to a ported valve cover breather. I was amazed at how much vacuum it created...
@@hanc37 WOW...! Thank you for that information and thank you for the view.
@@codyhatch4607 Both are negative I suppose. The only difference with the PCV is the vacuum is coming from the intake manifold instead of the header exhaust.
This could have been explained in 5 minutes!
I agree. Just get to the point.
More like 2 minutes
... or less.
🤌He was explaining the theory to Joe Average w/zero automotive experience.
Totally understandable.
Chill out friends ✌️.
Well the (D) blue side needs explanation
Excellent video! I always wondered what the hell the PCV does and now I know. I've always replaced it on my Astro van and my Lexus GS 300, but I never knew why. I like how you explain things clearly and succinctly. And your wit and dry sense of humor are terrific! 😊
Awesome. Thank you for that awesome comment and the views.
I stopped the video at 1 minute 19 seconds. I have no tolerance for that condescending tone. It wasn’t all in gest, it was being ugly for the sake of being ugly. It does what it says it does. It allows air to circulate through the crank case to maintain correct pressure inside the crankcase. Hence the name “positive crankcase ventilation valve”.
So far, you make more sense than any other person I’ve listened to. Thank you. Have subscribed, and liked.
You are Welcome and thank you for that positive comment.
Awesome lesson !! Teaching us everything exactly the right way to get strong in the profession. It shows how much you care - for our sakes . So good of ya ! It is invaluable .
WOW ! Thank you for such an Awesome comment. Also thank you for the views.
Very informative, and nice tip with the “paper stick” idea. Im not a mechanic just doing research like any other person trying to figure out their car issues and I appreciate your teaching method.
I am Glad to help and thank you for the view and that positive comment. I appreciate it.
Even at 70 I still like to tinker on my cars. I've never quite understood why the pcv valve is so important. Thanks for sharing this and your great sense of humor.
Great information. Engine oil and engines themselves literally doubled immediately in mileage because of the use of PCV's. A clean engine is a happy engine.
I agree. A clean engine is a happy engine. Thank you for the view and the comment my You Tube friend.
I remember working on old cars from the fifties that had no PCV system, just ' road draft tube ' that kind of pulled some of the crankcase fumes through just by the
' draft ' of moving fast.
The whole underside of most cars was a giant grease sludge pit.
Reminds me of my science teacher from high school.
Rest in peace.
I used to love his teachings.
Thank you for the comment and the view .
it can't be more clear. thanks a lot man. its really nice to see people who take the time to make this videos and explain them this well.
You're very welcome!
agreed 👌
I have a 1972 350, small cam, headers, mid rise intake, 600cfm carb. Head work and bottom end work (decent hp, lots of TQ, and this one is particularly high in compression 10:5:1 before head work and bottom end work )I'd put it at about 400hp at the flywheel because shes got alot of miles since the build, I'll promise you can't turn it over by hand with just #1 plug out. It'll break the crank bolt before it will. It spins normally with all 8 out.
I'd say this engine was overhauled and put in sometime around the year 2000 it was in service for around 10 years, parked for 12, deteriorating outside, years. Before I bought it and put it on the road.
It had been running bad since I bought it
I timed it, didn't fix it although it was out of time.
Replaced all vaccum hoses and pcv, didn't fix it.
Adjusted carb and all settings, didn't fix it,
Broke the new pcv I installed, so I had.to replace it again.
Didn't fix it again.
It was a specific kinda miss.
I tune with a vaccum Guage and tac.
I was getting a very lean fuel mixture, very low vacuum reading, and It was idling wayyyy too fast v
I had it running good as hell, but not performing.
Mind you this car sat for 12 years, and when I put it on the road I fixed anything I deemed "unsafe" such as tightening things, and making sure nothing is going to get into anything I did not build this engine, I did not put it in. I changed the oil made it run and drove it because it was fun.
After doing all that work a while back...
I did something naughty....
Something "forbidden" ........
I stuck a breather cap in my pcv valve grommet to match the other side which normally pulls from the massive vaccum leak known as a positive control valve and I plugged the nipple on the carb so it would volume of something a CARBURETED car desperately needs for economic reasons such as fuel economy... vaccum.
A PCV basically "sucks" all the time, as a vaccum leak does. It's just controlled inside the carburetor. Not tamed, just controlled. Technically, you're putting sludge in your fuel system this way on most vintage cars.,you're sucking motor oil residue into a ethanol fuel that already hinders performance and causes power loss, engine wear, and dosent spark very well in older ignition types. And you're mixing this ethanol and oil into a less grade fuel than is already to weak for combustion I'm these old v8s and even straight 6's thus causing a lean mix, not because of your settings, but because 87 octane just dosen cut it. I believe 98 was the standard for octane in the old days. It went as high as 240octane at special fueling stations and race track use. It was also lead based until the late 70s/early 80s with lots of additional additives for combustion.
The first generation small block chevy was designed with a vent tube at the back of the top of the block and a breather oil neck in the intake, it was front to rear ventilation. No massive leak of vaccum in the valve cover that usually aids in helping create that valve cover that always leaks on gm products because it's pressurized usually on the passenger side. And fess up, guess what? We know it's almost always the back pass side because that's where gm locates the pcv placement from the factory? Back passenger side. EGR too, pass intake (also vaccum) and guess what else? #6 plugs that usually foul, aka, least efficient cylinder.. it's already going to be this in old Chevrolet because on the firing order these 2 cylinders are farthest from #1 (the TDC of firing order) because thats just the way they built them. So you wanna pressurize this head, and pull all the "contaminated air"aka oil through a vacuum leak (controlled ofc) hooked into my intake, that ofc is the thing that makes the vaccum distribute from the crank case to ports ports the carburetor and any intake ports. so it'll get my fuel and air above it, coming in fresh, but only is to get blended with this oilly tainted loop of vaccum leak, to not only then be burned within my combustion chambers, which already won't make As.much combustion because the octane grade is poopeykaka for my ancient engines need for the fuel to burn hotter, hotter with less flash time and or length of combustion. And bit of a camshaft cresting less vacuum than before, it needs as much as you can give it and it's real design was made pre emissions so basically it created vaccum up top and the byproduct went out 2 vents in the engine
Since I took pcv valve out and replaced with twin valve cover breathers. ..
I haven't had sluggish throttle since.
Fuel economy went up,
Idles better,
Downshifts and upshifts better.
It even *rides smoother*
Idles properly, and will pin you to the seat in 3rd gear whereas before it was gutleessly slow and disappointing it wasn't until the pcv valve was removed did I get true improvement.
Cabureted cars don't need pcv unless they have all their original emissions control equipment in tact. If not ditch it for a breather.
Its important you have the breathers on BOTH valve covers. You want to optimize how much ccp can escape through these holes by gravity and force of engine. If you do this you'll have dirty valve covers.
Its a small price to pay for not having that buildup of grime on tbe vakve cover inside your intake and cresting carbonous sludge in your valve train and head internals
I will never waste my time with a pcv on a modified classic again.
Keep putting them on cars with ecm tho that's fine, just don't destroy the internals of a old gm engines all we got left is what's left of gms original casts. That goes to every mfg. business. That crested casts too suit out future
WOW...that was very interesting. Thank you for sharing the information and your personal experience. You are correct about carbureted engine and how the PCV system can cause problems. Thank you again for the information and the view.
I've had issues since I switched to the 600cfm Edelbrock from the Quadrajet that was on my 305. It used to scream and burn rubber up to the start of 2nd gear. I always figured I just went to big on the new carb, despite all the tweaking, but maybe this tip will help regain some of her former glory. Thanks guys!
Put a vacuum pump into the crankcase and dump the hydrocarbons into the exhaust, watch the power increase again. PCV systems just clagg up ur engine internals, especially for high performance, this is just another climate Nazi video.
No way a pcv is in my freshly rebuilt sbc. Breathers on both valve covers.
He's talking to us like we're all dipsticks!
He is teaching new bees...people who have no pre knowledge.....be patient ya ❤
😅😅😅yep
Don't do drugs kids
I have never seen this test before, I'm actually impressed and surprised that this isnt more common a test; best part is this test is so darn simple and inexpensive yet so effective.
Thank you for the view and that awesome comment.
Right 👍 Amen🙏
because tbats old school technique,
imagine them guys doing perfectly in their job that time without the technologies used today,
i could only say they were simply briliant,
low to no cost but effective way of tending cars
what more can i say
@@endurofan9854 I have two notifications of you replying to me and another.
I can't find them.
What's going on?
@@endurofan9854 Thank you for the view and that cool comment.
Thx bro you saved me from pulling my engine and re-building it again, thought I had blow by and someone had deleted the damn pcv valve on my damn car! 🤦🏽♂️
Awesome. Glad to Help. Thank you for the view and that comment.
Thank you for you elucidating video Sir ! Many reasonably mechanically adept folks I know could not explain the operation of the PCV system, & I will recommend your video to them. Cheers!
Thank you very much for that nice comment and thank you for the views.
Thank you for this video! Super clearly understandable. I wait for your next videos.
You are Welcome. Thank you for the views. New show soon.
I inherited my dad's truck recently. It's a 2003 Dodge Dakota SLT he bought in 2005 with 16k miles on it. It now has 235k and still runs great even though she smokes just s little, still smooth as ever but noticed when i chsnged the plugged up pcv valve the engine was quieter overall once the notorious lifters got in harmony and finally settled down 😂 but yes overall the engine is now quieter and i am noticing cleaner oil coming out every 5k mile oil change. I am currently driving it daily without concern that its a 20 year old truck. I wasn't aware of the importance of keeping the pan oil cleaner. I did understand the recycling process to reburn as all my cars got new pcc valves each year or 2 anyway. I appreciated your genuine desire to get this point across and i enjoyed the patch part 😂
If it smokes, buy 3-4 cans of BG 88k and EPR your engine
Quite good; couldn't stop smiling when the dude was explaining as though talking to a really old person... 😄
Thank you for the view and the comment.
Many moons ago, the blowby or crankcase fumes were vented to the atmosphere via a rubber tube running from the crankcase to the atmosphere. Along comes the EPA that said that was a no-no. Alas, the PCV valve was born, which directs the blowby gases back into the engine to be burned.
Everything you said is correct / correct/ correct. I grew up working on vehicles from the early 50's. I remember when a vehicle with a worn engine / excessive blow-by would come to a stop and smoke out the tailpipe AND from under the hood (from road draft tube) Thank you for the view and that input.
I just purchased a used 2017 Honda Accord Sport 2.4L Inline 4 cyl. This is my 1st time owning a modern inline 4cyl...
I was told to replace the PCV valve every 30,000 miles. Seems reasonable enough, as the PCV valve is very easy to replace on this engine. Thank you for explaining the reasons for this important maintenance!
You are Welcome and thank you for the view and that nice comment. Good luck my You Tube friend.
Yep it the earth dreams engine be careful because they’re notorious oil burners as a matter of fact the Chinese government banned that engine from china I don’t know if Honda has resolved the issue with the Chinese government or not but Scotty Kilmer has a video on the engine and it’s issue with oil burn one way to tell look at your tail pipes an you can see how sooty they are it’s an updated version of the venerable K-24 that I had in my 06 accord found the opening and closing spring was broken and it was causing it to vibrate heavily ordered a metal one off EBay for about $11.00 bucks got it in the mail and immediately installed to compensate while i waited for new one to come I simply drilled out the old one and screwed it back in take care
I just did what you advised and di it it on my 14 RAV4 ,when after start/hot engine condition the paper would not hold even I pressed it, after changing the PCV it holds on and the engine now run at idle smoother. Thank you so much, hope you'll continue and share more Auto vlogging tips.
Thank you for the view and the comment. I am so happy that I can help people like yourself fix cars, save money, and feel good about yourself. Thanks again my you tube friend.
"Paaaper muuuust stiiiick" 🧟♂️
Thank you for the video, señor! Extremely informative!
You are Welcome. Thank you for that Positive comment.
I just did this test in my Chevy V8 LS3 because I was suspicious about something wrong with the PCV valve. Test resulted just as in the video. So, PCV valve is ok. Thank You very much for sharing your knowledge Sir!
You are very Welcome.
One world = Brilliant! Sterling work Sir. Very clear and very much appreciated.
WOW...! Thank you so much. You have no idea how much that means to me. Thank you for for that positive comment and the view.
The PCV valve should allow a lot of flow when manifold vacuum is low- as in when you are accelerating heavily, and should only allow a small bleed of vacuum when manifold vacuum is high- such as idle and low load running.
Positive Crankcase Ventilation is the crankcase gases from combustion leaking past the piston rings and such from not just blowing out of the crankcase on their own but helping to draw the gases out and also feeding them into the intake so they can be burned.
Helps out all around
I've never seen it quite so exaggerated
@A. Melbs not sure how those are set up. All I can think of is making sure everything ' crankcase ' is sealed and plugged up ( kind of like his tests here ) and how it runs ( idles ) versus opening it up, like any oil filler caps off and dipsticks out, and comparing how it runs.
If it runs the same, while the ' piece of paper ' test shows vacuum is present, then should be working right.
@A. Melbs usually PCV valve is very easy to get at. Plugs into the crankcase somewhere usually on valve cover with a hose to intake manifold. Sometimes you can pull them out of their crankcase connection while keeping the intake hose on and while running on idle it should be holding in ' bleed ' mode. Then when you put thumb over the end the flow stops and spring pushes it to
' heavier flow ' mode. It clicks back and forth as you put your thumb on it giving you a good idea if it's working right.
I was trying to pinpoint a vacuum leak on a Ford Focus where the PCV valve is buried under the intake manifold and you can't hardly even see it. To check if it was PCV I had to put a long flat bar through the intake tubes and push against the vacuum hose to the valve to see if it changed speed. When I heard it clicking
( like putting thumb over the end ) I knew it was working okay.
Would a bad PCV valve cause the car to shut off
@@45chris45 it could. It would have to stick
' open ' to where it passes a lot more air.
In that position it would not want to idle very good, in fact, not at all and would quit.
Excellent video! Thank you!
You are Welcome and thank you for the view and that positive comment.
Thank you for demonstrating. Awesome! 👌
You are Welcome and thank you for the comment and the view.
I'm afraid the paper 'stick' method only tells you that the PCV valve is open, creating a vaccum. Unfortunately, the PCV valve can still be bad and still 'stick' the paper- in the case of it being stuck open when it's not supposed to be. (Creating a vacuum leak instead). I have a 2007 Hyundai Accent with misfire, one of possible causes is vacuum leak from bad PCV system. Hopefully that's it, I've seemingly tried everything else! It's a cheap regular maintenance part anyways, so I'm not even gonna test it- just replace and be done. Great video.
Thank you for the comment. Yes you are correct about the valve staying open. Thank you again.
I will never forget this trick, thank you sir! How would you set up a pcv system with a centrifugal style supercharger?
You are Welcome and thank you for the comment. More pressure / more power / more blow-by. So long as the paper sticks on the dipstick tube, your good. Check to see if the paper sticks at idle. If it does stick, give the engine a couple of quick revs. If the paper sticks during the revs, your good. If the paper does not stick during the revs, get the largest vacuum hose that will fit (adapter encouraged) and get a PCV valve for larger engine (displacement). So long as the larger hose and valve does not effect your idle too much, your good. Thank you for the view. Share with family and friends.
That's the way my wife talks to me trying to explain the right way of wiping the table, she says I'm dumb, i told her, "I married you, damit, I hate it when your right".
At the wand of the T-Shirt patch that one of his students made was hilarious sound like the cameraman was about to bust out, laughing 😂😂
Excellent demo .very important information I learnt today. Thankful to you professor 🙏🙏💐💐👌👌👌👍👍👍
Thank you for the view and the comment my you tube friend.
Passing automotive service excellence tests can get you some patches.
It costs you time and money, but it helps get your working knowledge into relatable and comparable language and ideas to relate about service, repair, and maintenance.
I believe, when we aren't manufacturer/factory trained, these tests help us see who has been through the testing successfully.
The unfortunate thing is, you can study their literature and take their tests without repairing or building anything.
Your ability to relate these concepts to another person is valuable. Experience takes book study and makes it into good thought.
Now let's not sound condescending in our method, but matter of fact.
I have discussed the system you covered in this video with some "mechanics" and heard some ideas that don't fully make sense.
It's because of the mode of the throttle.
The Chilton and motor manuals depict this system also and include diagram drawings with the different modes.
It answers why we had CCV filters in the air cleaner connected to the breather tube side.
Just wanted to give more to those who need to study their manuals and understand.
Many with experience know from repetition and observation.
Thank you for the view and that very thorough comment. What did you think about my video ?
@@theoldmecanicoshow9004 I dont know about him but I have been working on vehicles for upwards of 20 years and had no idea about this test.
@@HardWhereHero Hello. Thank you for the view and the comment. I have been fixing cars (trucks/SUV's/other) for 50 years. My first engine overhaul was in 1972. I still remember the vehicle. It was a 1959 Buick La Saber (aqua). I was in awe when that vehicle drove away from the high school where I took auto mechanics class. I thought it was so amazing that you can take all the engine pieces and put them together (just right) and bring life to a machine. Thanks again my You Tube friend.
@Danny Linc
wow
i did'nt know about the exam but thank for sharing the enfo,
there realy is alot more to learn every day
@Just-in Time
me neither 😆
18 years being a mech but have no idea there was an exam like that,
i realy still have alot to learn
Wonderful, repetition instills rememberance, Thankyou!
Great job , your total explanation in each phase of the PCV cycle helps the DIYer understand and Not memorize, that's what great teachers do, thanks I'll be checking out your future videos!
Thank you for the Awesome Comments and the views.
Thanks for making this, I genuinely feel like I learned something!
Glad to hear it!
I've been addicted to RUclips for about a decade. Watched (at least) a thousand videos. This is THE best thing I've see..............by far.
THANK YOU!
The dipstick paper trick is new to me, thanks. Usually I do the oil filler cap. (I had one MB diesel that would throw it far, up and away!) Now as to 4 cylinder engines, I counter-argue as mine is in a 1994 Volvo 940 (design hasn't changed much since it was put in passenger cars around 1964). That b230f is a durable, yet underpowered beast.
Thanks again, I'm going to do the paper trick to my gf's 2007 Honda fit.
Showed me how a neglected overlooked engine part is so important~
I'm glad I was able to help you, and thank you for the view and the comment.
Unbelievable teacher - thank you for your dedication to knowledge
You are welcome and thank you for the view and that positive comment.
Excellent information about the pcv on the car engine, How it works and it's function.. well done.
Thank you very much for that positive comment. Also thank you for the view.
I always checked my PVC valve by shaking it to see if it rattled. That meant it was moving freely. It always rattled, so I never replaced it.
PCV valve. PVC is a type of plastic.
Very helpful as I’m trying to figure out why the runners in my Corvette’s TPI intake are oil coated after only 300 miles of driving. I will have to try the paper test!
Thank you for the view and the comment. The intake gets dirty from two sources. The PCV system and the EGR system. Good luck my You Tube friend.
I have a Audi 4 cylinder turbo with great negative pressure. Even when it was stock it was amazing. Was stock 2 years. For thr past year it has a big turbo upgrade and more, pushing over 500hp (yes 4 cylinder). It’s a 2015 with currently 212k miles. Stock internals . Runs amazing.
Thanks for the info!
You must of got lucky and got one of the good ones. Audi modified the PVC valve that raises the pressure. It's over 300 bucks for the OEM. It is still a major problem, needs replaced often because it fails. Mine just started this issue now.
Robert Winnall are you saying you just upgraded the turbocharger and now your engine is pushing over 500hp? It's not tuned? Not even stage 1? What type of turbo did you install? BTW, which Audi? A4 or A6?
@@RayJays he says turbo and more. It would be kind of hard to put a massive turbo on without doing tuning so I'd assume it part of the "and more". I'd be scared to death of the timing chain failing if it was an A4.
junk car and you are such a big liar.
Man!! I just subscribed to this channel. Thanks man really appreciate it you sharing your knowledge. I’m a DIY on my vehicles and this kind of information helps sooooo much. Again thank you 🙏!
You are Welcome and Thank you for that awesome comment, the views, and the subscription.
When your mechanic is also your dealer
I like that you keeps it simple answering almost any question we might have about the pcv valve. 👍🏿
P E R F E C T L Y EXPLAINED! CLEAN & CLEAR! Thank you for giving everything from you to explain as good as possible! Really really helpful!!!!!
I really enjoyed listening and watching your video. I learned something new. Thanks!
Just subscribed!!
Thank you for that very nice comment and thank you for subscribing.
Excellent work my Friend! You explained it for the people that do not understand and you also explained it in a way that anybody that has a disability or difficulty listening or comprehending. They are now able to understand it way to go. I applied you. Excellent work!
Thank you for those Kind Words and the view.
Today I found out three things, I found out how to check a pcv and having a car with a v6 is a good thing but most importantly I found an excellent RUclips channel
Thank you so much for such a Flattering comment. Thank you.
Well done with your professionalism and very important educational experience, patience 💯👍the right way
Glad you enjoyed it!
What are your thoughts of a pvc delete? To be more specific, installing an oil catch can and venting off the remainder as apposed to recirculating? Can modern cars with their computer and data demands operate properly with such a modification?
The path that has brought me to these thoughts and questions is modern direct gas injected engines and the troubles associated with that. The carbon and dried oil build up in the intake manifold and the problems associated with that to be exact. Problems that I'm still learning about and trying to grasp.
Are oil catch cans an answer and should they be vented, or recirculated?
Your knowledge shared would be greatly appreciated.
Thank you for the question. Yes, a catch can is a very good idea. I would add the catch can and leave the PCV system installed. Thank you for the views.
Plug the vacuum side of the PCV, and turn the crank vent tube to a down ward direction. Cars from the 1900's to mid 60's all used a 'down draft tube' stop sucking a vacuum in your cranks case, you're mystifying the oil, and burning it... making the air/environment dirtier.
Direct injected cars develop carbon deposits on the valves which can reduce fuel economy and performance. I know somebody that did a pcv delete with vaccum side hose leading to the pcv blocked off, and the pcv replaced with an aftermarket straight through fitting on the valve cover with a hose that leads a catch can then a hose to the bottom of the engine. Their is a second hose that leads from the valve cover to the intake. That hose is disconnected from the intake and pointed down to under the engine again, and the intake side plugged off. So basically the valve cover is at atmospheric pressure, he has been running like this for 50k+ miles and the turbo 4 cyl runs like a beast.
@@dpok69 Catch cans work great. I plan on installing one on my vehicles.
I learned something new today, thank you.
You are Welcome. Thank you for that positive comment.
I would make a patch that says "ACE" because you aced this explanation--- funny and infomative. Good way to teach. Now I understand why my local shop told me I had a rear main seal problem... not serious yet but potential.
Thank you for the view and that awesome comment my you tube friend.
This guy talks to us like I talk to my 2-year-old...😂
Thanks! I was just going to change my PCV valve ($50 for the HEMI). My paper stuck, so I'll probably be okay to wait a bit longer?
Thank you for giving my channel a view.
The pcv valve changes when you accelerate this is just the idel test
This is the definitive test for a pcv valve. I have two cars that failed - both that passed the other usual test. I was able to clean the OEM valve better and get it to pass this test but the other ( aftermarket) would not despite it only having around 5000 miles on it and after cleaning to what seemed like new. Lesson for me is use only OEM and also to check frequently. The one l was able to get working was on the car that l only have 50 K miles on.
Thank you for the great tip.
WOW. Thank you for the view and the information. I completely agree with you, OEM parts are way better than aftermarket parts. Thank you again my You Tube friend.
Absolute best video on RUclips for the PCV
WOW... ! Thank you for that Awesome comment and the view.
12:50 One more important exhaust gas: H₂O. That definitely doesn't belong in your engine oil! Loved your clear and emphatic explanation, thank you. On a 4-cylinder engine, would pinching off the breather hose allow the paper/dipstick test to work as on a larger engine?
Just to answer my own question: yes, when I block the breather hose, the pressure measured at the dipstick tube drops gradually, reaching about -20 kPa (6.5 inHg) vacuum after about 10 s. Not as strong a vacuum as at the intake manifold, but definitely working. With the breather hose unobstructed, the dipstick pressure stays around ambient.
I also tested the PCV valve by attaching a syringe to the PCV hose coming from the engine, and confirmed that air can be drawn out of the crankcase, but the valve blocks return air. So I'm pretty sure my PCV valve is OK. :)
Thank you for the comment. I have seen larger 4 cylinder engines ( 2.8 L) stick the paper. I never thought of pinching off the breather before. You don't have to pinch off the 6 and 8 cylinders.
Does this mean that if you have a 4 cylinder engine you can make the paper stick by installing a more narrow breather hose? And therefore fix the problem that 4 cylinders have with creating crank case vacum? Or would that create more problems?
@@commentcrafter4158 My understanding is that while the paper test may not work with 4-cylinder engines, they still have enough vacuum to produce enough PCV flow to ventilate the crankcase and avoid pressurisation. You probably wouldn't want to block or restrict the PCV or breather hoses in normal operation. However, if you want to do the paper test, you could temporarily pinch or plug the breather hose.
@@commentcrafter4158 I believe that under some conditions of high speed, heavy load operation the "breather" hose is actually needed to handle the blow by gases created and under those conditions the flow is reversed so that it is into the air intake tube. So probably not a good idea to restrict that hose too much. Maybe a little? I don't know.
My 2012 Euro Civic (136000 km) consumes a little more oil than my wife's Euro Civic (2007, 210000km), i'm going to to this test on both cars. Greetings from Belgium!!🏁
Thank you for the comments and the views. It's just good idea to change the PCV valve and sometimes the hose that connects to the valve.
@@theoldmecanicoshow9004 Is it just replacing the PCV valve? No vacuum errors or resetting needed?
@@Tintoycar No programing needed. Just Plug and Play.
@@theoldmecanicoshow9004 I tested both our cars and the paper flew away 🙂 They are both 4 cilinders so difficult to trace a bad PCV valve?
@@Tintoycar I have tested brand new four cylinder engines, and the paper does not stick. Four cylinder engines are not large enough to produce the volume of vacuum, needed to put the crankcase under negative pressure. Only the larger four cylinders (2.6 or 2.8 ) can stick the paper.
The lecture was 💯 percent on point, whether the video was long great for people who don't know much about cars or mechanics. Ty buddy.
Just wanted to let you know that your video was very helpful as well as much appreciated.. you can be my teacher any day..
Awesome...! I'm so glad that I can help. Thank you for the views and that positive comment.
Best video ive seen! Simple and very informative.
Thank you for that Positive comment. Thank you.
Bro you just taught me so much - subbed!
Thank you for the Subscription. Please share with friends and family. Thank you again.
so if the paper sticks, the world is saved. Gotcha. We definitely need that
OMG , the tone & the emotion ! Great video I just laughed my ass off through it with the way you explain 😆👍
Thank you for the view and that awesome comment.
One of the best educational videos I’ve ever seen. You’re an exceptional teacher!
WOW WOW WOW...Thank you very much for that awesome comment and the view.
Love this guy! he is like the Cheech and Chong of mechanics
Thank you for that comment. I liked it...:)
Spot on 😆
Reminds me of my father but he speaks Spanish. Good info
Only one I can remember is "Buster the Body Crab". 😂🤣🤣😁
I 2nd that lol
Thank you for the excellent video Sir !
You are very Welcome. Thank you for the comment.
My experiment. Back in the late '70s, being young and bright (read foolish) I thought I'd "improve" my car by converting the PCV system to a road draft system. I plumbed a good-sized tube, with a diagonal cut, to the bottom of the car and replaced the PCV valve with this. After a week or so, I took off the oil fill cap and was greeted with a nice yellow blob of gunk. It was the sludge of water from the blow-by not being purged from the crankcase. I undid my "brilliant" conversion right away and never looked back. Yes, PCV systems do wonders for keeping the crankcase clean.
Great experiment and testimony on how important the PCV system is. Thank you for the view and that information.
This video is genius, genius. I have never seen or heard better and simpler and so concise in essence. Thanks for this video.
Wow, thank you!
Just drive without oil dipstick and problem is resolve..
A good mechanic told me you should really change your PCV valve every 3 oil changes and clean it on every
Thank you for the view and the comments. The main reason we replace the PCV valve is because it gets dirty and becomes restricted. Your mechanic is correct. Thank you again my You Tube friend.
This is like one of those 20 minute ads that promotes something but never tells you what unless you 'click the link below'.
Learned a lot from ya’ ! Thx 🙏🏼
I liked the humour at the end ! You are a total A.S.S.
Adroit . Skilled . Solid. 🏆
The world needs more coaches like you . 👍🏼
Thank you very much for that awesome comment.
THANK SO MUCH JORGE, , I LEARNED MORE ABOUT PVC THIS TIME, HAVE A WONDERFUL DAY.
You are very Welcome. Thank you for the positive comment.
Awesome video sir! A mixture of fine humour and vital information for me. Feel good and create many more lessons!
Thank you for those Kind Words. Also thank you for the view and comment. I have over 100 videos. I hope you watch some more of them. Thank you again.
I knew of the importance of the pcv valve, I didn’t know about this simple test, and yours Mr. is by far the clearestest’ of the explanations.
Thanks o lot.
You are Welcome and thank you for the view and that nice comment.
dont know what he smoked but I want some
Jefe, you have plenty of knowledge to share and for that I am grateful. Thank you.
You are Welcome and Thank you for the view and that nice comment.
Thanks! I learned something new. I love your patch!
Thank you for the view, the comment, and liking my "Special Patch" .
You made me laugh with the ASS and half-ASS patches! 😂😂🤣🤣 I like the way you explain things thoroughly. You have a new subscriber, sir!
Very informative video, and about the patches at the end…that was hilarious!
Thank you very much for that positive comment and the view.
Thank you very much. Knew about pcv valve but not its importance to such an extent.
You are Welcome. Thank you for the comment.
First time I have seen his posts. Feels like he got is presentation from watching the old 50’s “ Why is it so”: with Professor Julius Sumner Miller. Lol.
Thank you for the view and the comment my you tube friend.
I own a 1987 4runner with a 22re 4cyl with over 300k miles still running strong.
Awesome... thank you for the comment and the view.
the thing I love about your videos is it's almost like getting a college education for free
ThankYouThankYou...Thank you for the view and that very nice comment.
your series on vehicle A/C was so very helpful to me. Especially since we both live in the Texas climate and so much info out there is tailored for cooler climates. Keep the great content coming - I'll watch and like everything you put out.
Great advice a mother load of car know how . I’ll be inspecting all of my families PCV systems. Just found that my sons 2002 4runner hose was running with is collapsed and he has oil leaks on the valve gaskets.
Cool ! Thank you for the view and the comment. I am happy to know my videos are helping people with their car care needs.
Most acurate information on pcv valve I’ve com acrosss yet keep up the good work accuracy
Thank you for the view and that positive comment.
Fantastic lesson on the PCV valve. Thanks!
You are Welcome and thank you for the view and the comment.
Wonderful presentation, what are your thoughts on a oil catch can?
Yes they are GOOD. Yes they work. I just have not got around to installing any. Most of the time it should be fairly EZ....but some PCV' systems are crazy complicated.
You are wonderful, in knowing what is what. I am 71 years old with a 1966 Sunbeam Tiger. I know a pro when I see one.
Thank you very much for that awesome comment. And thank you for the view. I don't think I have ever worked on a Sunbeam . I will Google it to see what it looks like. Thanks again.
Your pace is very suitable for a people who don't speak english to understand. But i am still confused about that how to tell the pcv valve of a 4 cylinder engine is good or broken.
Most 4 cylinder engine are NOT large enough to create the volume of vacuum needed to place the crankcase under a slight vacuum. Thank you for the view and the comment. I learn from each comment.
Great teacher . I liked the way you explained the pcv function.
Thank you very much for that awesome comment and thank you for the view.
I love this channel. Helping a dumb ass like me learn how my engine works, avoid expensive repairs and even get my hands a little dirty. Please keep these videos coming 🙏
Hey Mr. Sanchez. This is Chad. I remember that shop and those vans!! Like you videos.
Hello Chad. I remember TWO guys named Chad. Are you the one fixing up the 57 Chevy or are you the one that pissed me off with that train horn? Either way, thank you for the views and the comment. PS: I saw my
"Big Beautiful Van" at You Pull It. It was sad to see it like that. Thanks again. I hope you reply.
@@theoldmecanicoshow9004 LOL Im the one with the train horn. Sorry about that
great video but one question - why do four cylinder engines not have negative crankcase pressure? do you expect flat 6 engines to create enough crankcase vacuum pressure for the paper to stick? I am interested in doing this test on a 2005 subaru outback with an H6 (EZ30R) engine. Thanks
Size counts. It take a very large amount of vacuum to over come the blow by pressure and put the crankcase under vacuum. Only larger four cylinder engines (2.8 L) can create enough vacuum to put the crankcase under negative CC pressure. Thank you for the view and the question.
I have a 2012 Acura RDX, turbocharged, 4 cylinder. It will be interesting to see if it makes the paper stick or flutter. This is an excellent presentation with, helpful information. Thank you!
You are welcome and thank you for the view and tat positive comment.