torpilas

I ran a stock '99 A3 1.8tq (150ps) and recently noticed that whan accelerating slowly from low revs, at around 2000 revs the car trembles 2 or 3 times like a situation between boost and no boost and after that everything rans ok and boost is building fine. In case i accelerate with full throttle there is nothing like this... Last week replaced the DV with new one but nothing seemed to improve and checked for leak but found none at first glance. Also vaged the car 2weeks ago and that's what came up: 1 Fault Found:
17963 - Charge Pressure: Maximum Limit Exceeded
P1555 - 35-10 - - - Intermittent
Then cleared it and never came up again.
What do you think the problem might be?

P.S.: The same time occured a rough idle problem, changed the coolant sensor but no improvement... well i don't know if that's related to the other problem but i just mention it.

JAFO

is your car dbw?

torpilas

It has electric gas not cable, if that's what you mean...

ScratchRob13

thats called drive-by-wire aka DBW

JAFO

not really sure on location they never sold the 1.8T A3 in the states.

Quattroleap

<center><img src="http://pictureposter.audiworld.com/49529/k03_turbo.jpg"></center><p>
the cars starts to jerk and shudder as it loses
boost between 2000-2800 rpm. In my case a banjo
bolt came undone and fell off the turbo housing,
this line feeds vacuum into the N75 valve. This is
something you might want to check if you havent
yet, even a loose bolt will create a vacuum leak.