vlad2.7T

i would feel it in stock mode only in 93 Oct mode

JWeb

As I say, I don't have a CEL. How did you come to the conclusion that it was the EGR sensor? Can VAG provide any information?

vlad2.7T

if you switch to stock mode do feel same stumbling when you accelerate

Edd W

rather than suddenly failing when it reaches a specific boost/airflow.

Edd W

of the symptoms you are seeing.

Edd W

holed pistons etc... - surely it would just make it drop the boost and ignition timing as well - nothng reduces the possibility of pre-ignition as quickly as retarding the timing by a massive amount - tis is doing quite the opposite.

I think it is either a restriction in air-in or a leak after the turbos.

JWeb

... I didn't have time to take things apart this weekend, but I plan on re-doing the leak test. Thanks for all of your suggestions!

JWeb

... I'm still concerned about my peak reading of 190 g/s. This could be the "chicken or the egg" syndrome I contemplated in my original posting, though.