2000 A4 Avant Quattro Hot running engine

[Grant Lenahan]

Sounds like a mixture issue.

Mixture should set a code.
Do you have codes? Pull codes.

You also need to ask what you changed, disconnected, hit while installing the exhaust.

Are all emission components connected and working properly?
Without them you have no mixture feedback loop, and the results could be lousy running on all fronts - emissions, power, etc.

Grant

On Dec 17, 2011, at 11:03 AM, Werner Raschdorf wrote:

> I just pulled some of the plugs and noticed severe carbon fouling. I'm sure
> this is part of the problem. But what do I check next?
> 
> Werner
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