Question about 1988 Jeep Cherokee

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Jeep running rough; black smoke from tailpipe; dying occasionally

1988 Jeep Cherokee 4.0 Litre
-Problem Started When the car was jumped and the engine ground cable burned through (cut it in half)

-Replaced Items
-Rotor and Cap
-Engine Ground Cable

-Other Symptoms
-Runs extremely rough
-Lack of Power when accelerating
-Blows Black Smoke out of the tailpipe

So what could possibly be causing all of these problems?
Any suggestions welcome


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  • 15 Answers

Have you taken a spark plug out yet? You may have fowled them out. if they are not clean and have a whitish tone to them, then they need to be replaced.

Posted on Nov 28, 2008

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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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