Question about 2004 Chrysler Pacifica

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After engine is warm, vehicle will run rough and emmit black smoke from exhaust when at a stopped position, engine idles very irratic

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You have an over fueling issue. You may have a bad fuel pump. fuel pressure regulator, maf or map sensor. Also the 02 sensors are the for fuel control. You may have a bad one. Also look for vacuum leaks., Not much you can do at home without test equipment. You should have it diagnosed

Posted on Nov 12, 2009

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Idle speed rough black smoke


More information needed, what model vehicle and what engine? Fuel injected or caburettor? That sort of info.

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Black smoke>fuel consumption>rough idle


Hi there:
Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.

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The blue smoke can be one of two thing.

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===
I will take a 5-10 minutes high rpm (not redline) ran on the highway.
Pay close attention to the rear view mirror and look for black diesel soot.
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