eurocars
5/17/15 - Never forget
- Location
- Indianapolis
- Car(s)
- 2006 GTI
..in one direction
V
quick and easy pcv check?
- Thread starter Renagade
- Start date
..in one direction
UG_GTI
VW Doktor
- Location
- Madison,WI
what other direction is there if you are blowing through the hose while connected to the pcv?:iono:
eurocars
5/17/15 - Never forget
- Location
- Indianapolis
- Car(s)
- 2006 GTI
Only one way if it's disconnected...
soze
Go Kart Champion
- Location
- Orange County, CA
- Car(s)
- Something Else
same way to test for the TSI?
Renagade
I am the Evil Bastard!!
- Location
- The Woodlands, TX
after the pcv fix, i removed the cap while idling. ran fine.
delavmkv
Passed Driver's Ed
- Location
- Vancouver, WA
- Car(s)
- 2008 GLI
Hey! This is my first post on golfmkv, but I just wanted to say that I really enjoy the board (especially compared to vortex). Here is my VW:
To clarify - a properly functioning PCV valve should allow a user to remove the oilcap without affecting the idle? There seems to be a fair amount of conflicting information out there!
Thanks
To clarify - a properly functioning PCV valve should allow a user to remove the oilcap without affecting the idle? There seems to be a fair amount of conflicting information out there!
Thanks
enjoyincubus365
GTJedi
- Location
- Green Bay, WI
- Car(s)
- 2008 GTI
Hey! This is my first post on golfmkv, but I just wanted to say that I really enjoy the board (especially compared to vortex). Here is my VW:
To clarify - a properly functioning PCV valve should allow a user to remove the oilcap without affecting the idle? There seems to be a fair amount of conflicting information out there!
Thanks
I agree. I do not think this was ever definitively answered.
Feel free to pop by here and say hi! And welcome to my favorite place to be :happyanim:
http://www.golfmkv.com/forums/showthread.php?t=26&highlight=introduce&page=211
yeahforbes
Go Kart Newbie
- Location
- NJ
- Car(s)
- 2017 Golf R DSG
This thread is fairly old, but I'm reviving it because I'm looking to check my pcv and ended up here, yet the thread ended with a distinct lack of information about whether the car is supposed to idle better or worse when the oil filler cap (or dipstick) is removed.
Does anyone know for sure, and is this a guaranteed way to diagnose that a pcv is either good or bad based on the results of doing this? Or should the oil cap / dipstick test be completely ignored and we should only use the blow-into-the-hose test?
EDIT: My engine idles rough when pulling the dipstick, and I can't blow into the hose. I think it's good...
Does anyone know for sure, and is this a guaranteed way to diagnose that a pcv is either good or bad based on the results of doing this? Or should the oil cap / dipstick test be completely ignored and we should only use the blow-into-the-hose test?
EDIT: My engine idles rough when pulling the dipstick, and I can't blow into the hose. I think it's good...
Last edited:
If equipped with a PCV delete, removing the filler cap will change nothing as the tube to the intake manifold was deleted when a PCV delete or a catch-can was installed.
If it is still PCV equipped, removing the oil filler cap, or pulling the dipstick out a bit, should make it run rough at idle because you've introduced an air inlet leak. Meaning the MAF now reads much less air. Blowing into the PCV-to-manifold tube when disconnected (where circled), only tests the check valve (at the arrow) inside the PCV is containing boost in the manifold when boost is present. If this check valve is failing to contain boost...it will still run rough when the filler cap is removed.
There are still two more valves within the PCV system. The large diaphragm inside the large disc can be torn. Its cap can be removed for access to inspect it. But the cap is delicate and can break or chip while attempting to remove it. Then there is the rear recycling check valve. It is either mounted inside the Rev.-R PCV or mounted in the rear vent tube if using the Rev.-P PCV. The recycling check valve opens to the turbo inlet when there is positive crankcase pressure and closes when crankcase vacuum is present.
If it is still PCV equipped, removing the oil filler cap, or pulling the dipstick out a bit, should make it run rough at idle because you've introduced an air inlet leak. Meaning the MAF now reads much less air. Blowing into the PCV-to-manifold tube when disconnected (where circled), only tests the check valve (at the arrow) inside the PCV is containing boost in the manifold when boost is present. If this check valve is failing to contain boost...it will still run rough when the filler cap is removed.
There are still two more valves within the PCV system. The large diaphragm inside the large disc can be torn. Its cap can be removed for access to inspect it. But the cap is delicate and can break or chip while attempting to remove it. Then there is the rear recycling check valve. It is either mounted inside the Rev.-R PCV or mounted in the rear vent tube if using the Rev.-P PCV. The recycling check valve opens to the turbo inlet when there is positive crankcase pressure and closes when crankcase vacuum is present.