[200q20v] Rich Running

[Claus Vegener]

"Everything" You could imagine cause the computer to order rich running
and degrade boost
1. Idle switch
2. MAF sensor really rich running
3. Vacuum leak between MAF and turbo inlet gives erratic idle
4. Leaks at the pressure side gives rich running

I can't kill the 2121 code = idle switch.
Measure connections 1-3 OK, hear the click -OK, spray contact cleaner and
enhancer inside and outside at connections. And the code make the ECU to run
sligtly rich and degrade boost.
After the first 10 km each morning I check my fuel usage to see, if I have
any
problems :-)

Kind regards
Claus - going back to basics - removing ECU control of boost!

-----Original Message-----
From: Derek Pulvino <dbpulvino at hotmail.com>
To: 200q20v at audifans.com <200q20v at audifans.com>
Date: 10. juli 2001 17:39
Subject: [200q20v] Rich Running


>Hey all,
>
>Anybody have any suggestions as to what would cause rich running in the
200?
>  Haven't run fault codes yet, but I have noticed on startup the car runs
>rough, idle fluctuates, and once in a while will emit a gray cloud on
>startup (like this morning).  From the smell, I'm real sure this is fuel,
>not oil burning.  Also notice while driving hard often times I'll get a
>catalytic converter smell, this with the car warm.  From what I know about
>cats, doesnt this also show rich running?  Don't the cats function to
remove
>unburned hydrocarbons before they can be released to the open air?
>
>Although gas mileage hasn't been noted to diminish lately, my guess is the
>car is running rich across the board, just don't know why.  Anybody think a
>bad tbv would contribute to this?  The car also stalled on letting off the
>throttle last night.
>
>Any help or input would be appreciated, would like to clear this up before
>too much time; don't want to ruin some cats because of an improperly tuned
>engine.
>
>Derek "smoggy" Pulvino
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