Evzen

I just got it back from the dealer. They spent 2 days fixing the coolant (therm, seals and pump)and vaccum pump, also they did the 24k service. Before I took it in for service i noticed a slight whistling sound coming from the engine when hard on the throttle @3k rpm. But it still pulled quite well - though I was suspecting a slight loss of power.
Now it does not pull well at all. I am suspecting that the BPV may be faulty but I have no way to verify this. I do not have a boost guage.
Is it possible for the dealer to somehow flash the chip ?(it is an APR chip and they say it cant be so I dont suspect this) or
A leak somewhere, possible BPV, in the piping or what not. Are there other ways to find out if there is a leak?
I was thinking of getting the porsche 993 BPV. It is cheap compared to most after market products.

2000 1.8T QM

audimods

do you have ECMS? my stock BPV was leaking boost at 4000 miles.

EdP

spots to check:

BPV

intercooler endtanks (they are clipped on!!!)

Hoses on the pressure side (after turbo). You HAVE to actually take them off and closely inspect them.

Evzen

I will wait until the temp goes above freezing to look at it. thanks for the info Ed.