2 Plastic bags from Walmart solved the problem!!! Who is the best VW mechanic?

Thanks, but mine is located behind of valve cover, I just posted one more picture.

I don't think its located in the same spot in all years. Anyone else want to chime in?

http://i21.photobucket.com/albums/b261/bklymus/awm-pcv.jpg

Same valve. Different model years were in different locations. 03-05 were up top. 98-02 were on the turbo inlet pipe on the other end of the metal pipe.

Even though they changed the location of that valve, it's purpose and function stayed the same. It's part of the PCV system. During vacuum operation, this path is where fresh air is allowed to enter the crank case. During boost operation the direction of flow through that path reverses and crank case gasses pass towards the turbo intake pipe.

I'm guessing you have a problem throwing off your fuel mixture and blocking that path richens things up a bit causing the idle to get smoother. Scan for codes. Inspect for broken/cracked/disconnected vacuum hoses. Do a boost-leak-test to find hidden leaks in the intake system. Check the PCV metering valve under the intake manifold to be sure it's healthy. Check MAF and O2 sensor function. Check Group 32 fuel trim data.

Blocking that path isn't something you want to do as a long-term fix. With a sludge prone engine you want the PCV system fully operational.

del

Your problem probably isn't that valve itself. It stays open most of the time and only closes to regulate flow sometimes during boost. Look elsewhere for the cause of this problem.

Steve in Chicago said:

Your problem probably isn't that valve itself. It stays open most of the time and only closes to regulate flow sometimes during boost. Look elsewhere for the cause of this problem.

Click to expand...

You are right!!!! MAF is new suspect, see new thread.

steve where under intake manifold is the pcv metering valve,i have 2002 1.8t,engine code is awt

thanks for quick reply

There should be vacuum restrictor, orifice. Where is it? I think, you told me, it was not a regulator valve. I have strong flow from air box directly to intake manifold.
If regulator replacement doesn't help, I 'll have to make some restrictor

car5car, the diagram in post #11 should be about how your PCV is laid out. Part #6 is the metering device I'm suspecting might be bad.