Question about 1996 Pontiac Firebird
Neither cat nor sensor.
You have a leaky fuel injector (stuck open).
Black smoke is unburt fuel.
Obtain a mechanics Stethoscope (like a doctor's steth, but has a rod onthe end instead of a disc).
You will find the faulty injector quickly.
Best to replace it.
(By the way, white smoke is Water and blue smoke is oil)
Posted on Sep 28, 2009
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Posted on Jan 02, 2017
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