Couple years ago i did some CR V pcv valve investigation - looks like oem part (but even them aren"t 100% airtght) needs to be cleaned from time to time only, most aftermarket ones are poor quality, specially their valve plate mashining is bad, univen suface let to much air goes through. Thanks for your video and wish you all the best.
If you soak it in toilet bowl cleaner for 15 minutes it will be like new. You have to use a can of compressed air to clean it. Thank you so much for your helpful video.
Great test.... BUT..... I'm not sure that even a "proper" functioning valve will be absolutely air-tight....like (say) a car's intake or exhaust valve is on a metal-to-metal seat. As long as the unit "clicks" when shaken and if the spring inside is predominantly pushing in the correct way to attempt a "mostly closed" condition.....I think these PVC valves are then OK. Perhaps a pro-mechanic can chime in and advise ?
@@vermontvermont9292...odd.....seems all the various brands I've seen are able to be heard if shaken. If a spring is used inside, ...the spring is typically very weak and only serves to push the seat in one direction gently...as the vacuum created to activate is not very great. Which car or brand do you see that doesn't have an audible sound?....curious....
@@TheWilferch 2016 Honda CRV with the k24w9 engine. I. Other words, the pcv valve is located in the valve cover and uses only ports, no ball valve that shakes. If you were looking for an example.
There is not scheduled mile change for PCV valves as far as I know. Normally it is recommended to check and replace the PCV valve during major schedule changes. For Honda vehicles I believe that's about 100K to 120K. I think is best to inspect it every 30K miles and replace as needed. It's not difficult to check it and not many tools are needed.
I tested mine too and it "leaked" too 😂. But the size of the leak depends on how much pressure you put on the other side, if you put a high pressure, like say, you blow very hard, the "leak" gets less than if you blow lightly. So I suspect the pcv just regulates the pressure on both sides, it is not a one way check valve like you said
I normally check it every two years. There was a point at which I had a high oil consumption and an engine light with a warning of a high fuel/air mixture. I decided to look at everything in the vehicle and the PCV was one of the things I checked.
The main symptom was oil Consumption on a 19 Sonata 2.4. no signs of leakage anywhere but seemed to lose a quart every 1k miles. I swapped PCV valve today because I read a bad valve can cause that. There are other possibilities like piston seals, but a valve was 9.99 so it was worth a shot. I seem to have more power, time will tell if it fixes my oil consumption issue. Another symptom is engine performance is bogged down, not as responsive to gas pedal use. Another symptom is bad idling. When I bought this used at 92k miles I changed brakes, tires, iridium plugs, to name a few, but did not get the PCV valve this time which is one of the first things I do on a high mileage used car.
Dudes, just blow through the darned thing. Air flows one way, good. Air flows both ways, not good. Also, it is pretty easy to end up with a brand new valve that leaks. I just checked two today. One was good and one leaked.
The most critical item on this valve is the internal spring and no one mentions it..Even if the valve appears to work, if the spring has lost its stretch over time then the valve needs to be thrown out..😉😭
Question, anyone who knows... I bought a new OEM PCV. I blew into one side horizontally (the way it is installed on my engine) and it had an air leak. Vertically, there was no air leak. I returned it and got another one, but the same issue? Maybe my lungs are not as strong as an engine! What do I do? Order another one? On my engine (toyota) it is a difficult R&R.
Why even test these cheap items. I just replace it and make sure that they are Oem and not some garbage Chinese knockoff because they have a calibrated air flow especially on those lousy GDI engines where oil build up in the intake manifold causes so much problems not to mention oil leaks due to the valve not sealing properly
They are cheap to buy and can cause major engine costs and the 'test' is not at all foolproof. Just buy and replace an OEM one at NAPA for under $10 and it is a simple replacement and can cost major repairs. Don't fool with it.... just get a replacement that is OEM.
my autozone PCV valve had me scared thinking I was having lift ticking. Or a shorted electrical issue. I am NOT buying ANYTHING from AZ that has to screw or snap into my car!!!
Oil can never reach the PCV valve. If it could the engine would have used a lot of oil. And the PCV valve would have been cleaned by the oil. In fact it not washed that is why it accumulates ash particles over time.
Great test. I have never seen anyone use a balloon to test a PCV before. Thank you for the tip
Couple years ago i did some CR V pcv valve investigation - looks like oem part (but even them aren"t 100% airtght) needs to be cleaned from time to time only, most aftermarket ones are poor quality, specially their valve plate mashining is bad, univen suface let to much air goes through. Thanks for your video and wish you all the best.
If you soak it in toilet bowl cleaner for 15 minutes it will be like new. You have to use a can of compressed air to clean it. Thank you so much for your helpful video.
Excellent test ! Thank you
Great test.... BUT..... I'm not sure that even a "proper" functioning valve will be absolutely air-tight....like (say) a car's intake or exhaust valve is on a metal-to-metal seat. As long as the unit "clicks" when shaken and if the spring inside is predominantly pushing in the correct way to attempt a "mostly closed" condition.....I think these PVC valves are then OK. Perhaps a pro-mechanic can chime in and advise ?
You are correct. Its not function of pcv valve, main function is limit air vacuum on idle
Not all pcv valves have an audible sound when you shake it.
@@vermontvermont9292...odd.....seems all the various brands I've seen are able to be heard if shaken. If a spring is used inside, ...the spring is typically very weak and only serves to push the seat in one direction gently...as the vacuum created to activate is not very great. Which car or brand do you see that doesn't have an audible sound?....curious....
The PCV should seal so that you don’t put pressure into the crankcase. This is a great test to check for a weak spring.
@@TheWilferch 2016 Honda CRV with the k24w9 engine. I. Other words, the pcv valve is located in the valve cover and uses only ports, no ball valve that shakes. If you were looking for an example.
Great video. Saved me a great deal of time.
So what happens if valve is stuck open
Cool! Thanks for explanation. How many miles should this valve be changed?
There is not scheduled mile change for PCV valves as far as I know. Normally it is recommended to check and replace the PCV valve during major schedule changes. For Honda vehicles I believe that's about 100K to 120K. I think is best to inspect it every 30K miles and replace as needed. It's not difficult to check it and not many tools are needed.
@@fixit9888 Many thanks for you help!
@Bruce Wayne the valve is not that expensive, 75K change is a good time to replace it as a preventive measure. It's not that difficult to replace too.
Causa consumo anomalo di olio su Subaru ee20z diesel?
@@boxerdiesel no, no causa consumo abnormal.
I just tested with a brand new pcv valve and it will leak air just like your "broken" one does...
Does it leak out air fast or is it very slow?
@@fixit9888 pretty fast. Il will keep air in if you keep it upside down. But will leak horizontally... and ballon will deflate quite rapidly.
I tested mine too and it "leaked" too 😂. But the size of the leak depends on how much pressure you put on the other side, if you put a high pressure, like say, you blow very hard, the "leak" gets less than if you blow lightly. So I suspect the pcv just regulates the pressure on both sides, it is not a one way check valve like you said
What were the simptoms of the engine that made you to check the valve? thks.
I normally check it every two years. There was a point at which I had a high oil consumption and an engine light with a warning of a high fuel/air mixture. I decided to look at everything in the vehicle and the PCV was one of the things I checked.
The main symptom was oil Consumption on a 19 Sonata 2.4. no signs of leakage anywhere but seemed to lose a quart every 1k miles. I swapped PCV valve today because I read a bad valve can cause that. There are other possibilities like piston seals, but a valve was 9.99 so it was worth a shot. I seem to have more power, time will tell if it fixes my oil consumption issue. Another symptom is engine performance is bogged down, not as responsive to gas pedal use. Another symptom is bad idling. When I bought this used at 92k miles I changed brakes, tires, iridium plugs, to name a few, but did not get the PCV valve this time which is one of the first things I do on a high mileage used car.
What would happen if you just removed it and put a mini k&n air breather
smoke everywhere
Dudes, just blow through the darned thing. Air flows one way, good. Air flows both ways, not good. Also, it is pretty easy to end up with a brand new valve that leaks. I just checked two today. One was good and one leaked.
Thank you 🙏
The most critical item on this valve is the internal spring and no one mentions it..Even if the valve appears to work, if the spring has lost its stretch over time then the valve needs to be thrown out..😉😭
Thank you!!!
Question, anyone who knows...
I bought a new OEM PCV. I blew into one side horizontally (the way it is installed on my engine) and it had an air leak. Vertically, there was no air leak. I returned it and got another one, but the same issue?
Maybe my lungs are not as strong as an engine! What do I do? Order another one?
On my engine (toyota) it is a difficult R&R.
No, small leakage is ok
Good video
Nothing about flow? I guess this.. valve, has more than just one phase..
Why even test these cheap items. I just replace it and make sure that they are Oem and not some garbage Chinese knockoff because they have a calibrated air flow especially on those lousy GDI engines where oil build up in the intake manifold causes so much problems not to mention oil leaks due to the valve not sealing properly
Find me a 2zz celica OEM pcv valve and il ddo that, cant fine 1 anywhere
@@d4ngerous4 same. 1zzfe with 350k, Toyota dealership has to special order it.
@@Feckoff730 nightmare
I would only replace it , always not clean it .
They are cheap to buy and can cause major engine costs and the 'test' is not at all foolproof. Just buy and replace an OEM one at NAPA for under $10 and it is a simple replacement and can cost major repairs. Don't fool with it.... just get a replacement that is OEM.
Cheap huh?? My 2014 Honda Accord cost $47 and is all plastic.
my autozone PCV valve had me scared thinking I was having lift ticking. Or a shorted electrical issue. I am NOT buying ANYTHING from AZ that has to screw or snap into my car!!!
I don't think there's any reason to buy a new pcv.Valve, just take it off and clean it.Save yourself some money.
they cost like 5 bucks just change it
To close the air gap as vaccume gets stronger your not testing nothing right and u don’t know what pcv valve does do you
Oil can never reach the PCV valve. If it could the engine would have used a lot of oil. And the PCV valve would have been cleaned by the oil. In fact it not washed that is why it accumulates ash particles over time.
Ballon side sucks
If its leaking the ball bearing inside is worn out of spec. There is no fixing that
If it's just carbon buildup preventing it from sealing, then this would work just fine.