200 10V stumbles, poor mileage

[Huw Powell]

A failed oxygen sensor could cause such symptoms.  Put a voltmeter on 
its output at warm idle, while connected, and check what it's doing.

Konstantine Bogach wrote:
> 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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> 

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/