Re:200 stumbling

[quk@sievers.com (Phil Payne)]

In message <s295b255.083@EWICO1.DIGITALGLOBE.COM> Alex Chernushin writes:

> >On Monday 11/18 I was on my way home when I tried to
> >accelerate my car stumbled at anything above half throttle. As
> >long as I keep the boost at or
> >under 1.2bar it runs fine. It wont allow any hard acceleration. It
> >doesn't
> >respond to rapid throttle inputs. Feels like I am hitting the rev
> >limiter
> >when I floor it. The car is a 1991 200Q 20V. Any help or
> >suggestions would
> >be appreciated.
> 
> Same symptoms I've seen in a '91 TQW with a bad mass air flow
> sensor.  I think there was someone else on the list with a bad
> MAF sensor.

It sounds like too much air getting through the camshaft and crankshaft oil 
seals.
 
The excess air causes the mixture to be set rich to compensate - when the WOT 
switch enriches the mixture, it gets far TOO rich and the engine stumbles.
 
a) Is the CO setting erratic?
 
b) What colour are the plugs? 

--
 Phil Payne
 phil@sievers.com
 Committee Member, UK Audi [ur-]quattro Owners Club