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Re: Black soot in the rear (archive)

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Posted by Roops on September 24, 2001 at 09:20:34:

In Reply to: Black soot in the rear posted by Stef on September 24, 2001 at 08:54:22:

It's particularly bad on cars that had cats. and had them removed, as is the vogue in Europe/UK. Mine used to be really bad, but the AFM had been played with by a previous owner. After this was set back to the correct setting it vastly improved, but still leaves a sooty residue. Running rich is not great, if it is super rich you will get bore washing were most of the petrol ends up in the sump, this is quite common with overboosted turbo engines.
Of course if it is a bit rich you always get the nice F16 on afterburner flameouts, which is nice.


My car sits in the garage unless taken to the track. Started it up yesterday in the garage and let it run for a few minutes and noticed when I walked to the back that there was a bunch of black soot that came out and was on the garage floor. It came from the exhaust and when I hit the throttle it would come out even more. ANy ideas?

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