Boost problems

[Swann, Benjamin R. (BSWANN)]

Richard,

Except for the pressure reading you describe, it sounds exactly like the
overboost fuel pump cutout that is triggered when the ECU detects 1.5 Bar.

Check/replace all your vacuem/boost lines, starting with the lower wastgate
hose.  

Check the archives for this common problem "'87CSTQW Engine under load cuts
out momentarily."

Regards,

Ben Swann
'87 5KCSTQW
++++++++++++++++++++++++++++++++++

>From: "RICHARD MEZIC" <rmezic at keyspanenergy.com>
>To: <quattro at audifans.com>
>Subject: Boost problems
>Date: Mon, 25 Sep 2000 12:31:30 -0400
>While driving the '91 200q (all-stock) around town this weekend, I noticed 
>the following problem:
>
>When I "get on it" and the engine develops boost above 1.2 bar, the engine 
>(and entire car) bucks like a bronco(!).  It can be quite disturbing if 
>you don't expect it.  And it's tough driving the car and intentionally 
>accelerating *slowly* :)
>
>I'd suspect vacuum (or actually pressure) leaks somewhere.  I'd think when 
>the engine is running vacuum (<1.0 bar) it doesn't care if it sucks air in 
>from the leak or from the airbox.  Once the turbo pressurizes the system, 
>the air gets pushed out of the leak because it's under positive pressure.
>
>Could this also be related to another problem I've been having 
>recently?  The car is hard to start.  It will take a considerable amount 
>of cranking for it to initially "catch".  Once it does, it idles 
>fine.  Does not seem to matter if the engine is cold or hot.  FWIW, once 
>started, the exhaust smells as if it's running rich.
>
>Any possible causes, or more importantly - solutions?
>
>-RJM-