200 10V stumbles, poor mileage

[Ed Kellock]

Oxygen sensor?

-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
Behalf Of Konstantine Bogach
Sent: Saturday, December 19, 2009 10:09 AM
To: quattro at audifans.com
Subject: 200 10V stumbles, poor mileage


Hi all,

my 200 MC2 stumbles at idle or when I increase RPM, until I am at 3000 
rpm.  Above 3K I don't feel stumbling.  All plugs are same wet and 
black. Coil resistance,  CIS system and control pressure are within the 
spec.  Can not see a vacuum leak anywhere (also did carb cleaner spray 
test).  But I don't think it is a leak b/c at higher boost it runs 
better rather than worse.  Inspection of ignition distributor cap did 
not reveal a clue (I tried the spare one too.)
  Almost not working in cars last 2 years I forgot what I had learnt 
before (mostly from this list).  What I should be looking next?  Can 
broken soldering in the throttle switch cause such symptoms ?  Hall 
sensor?  RPM or crank position sensor?  There is no codes stored.

All ideas will be appreciated.
Thank you.
Konstantine
200 '91 & UrS4 '93. _______________________________________________
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