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Your car is either running way too rich or the rings are worn out and your buring oil. If it is just running rich one of your sensors are out or you need a general tune up. If your rings are worn out then your engine needs rebiult. To tell if your rings are bad your cars smokey exhaust will have a blueish tint to the smoke.

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โˆ™ 2006-03-13 21:30:12
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Q: What would cause a rough idle and heavy black exhaust in a 1991 Tercel?
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It is buring oil this is a wrong answer whe engine burn oil to the exhaust smoke is a heavy white smoke no black

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