Black Smoke?

[nodoebrando at iwon.com]

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?
 

P.S. My 93 90 CS is running like a champ.   



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