Black Smoke?

[Ti Kan]

> A friend of mine is driving a 1997 1.8T A4.  He has about 73K on it and
> has had some trouble with black smoke coming out of the exhaust when the
> turbo kicks in.  Any ideas as to what the cause is or what to do about it?

That's likely to be normal behavior.  Under full throttle the ECU would
go into an extra enrichment mode to increase power, the extra rich mixture
would generate black smoke out of the tailpipe.  This happens with all
kinds of cars, not just the 1.8T.

-Ti
01 S4 2.7 biturbo quattro
84 5000S 2.1 turbo
80 4000 2.0
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    ///  Ti Kan                Vorsprung durch Technik
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