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Balck smoke usually means the engine is burning rich - that is to say, more fuel is being delivered to the combustion chamber than can be ignited by the spark plugs. Keeping a good tuneup schedule and clean-up/replacement of sprak plugs will prevent, or at least minimize the black smoke under heavy acceleration.

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2008-02-04 15:02:06
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Q: What would cause black smoke out of exhaust under heavy acceleration?
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Why does my diesel produce black smoke?

Under heavy acceleration all diesels produce black smoke. It's a product of waste fuel being exited via the exhaust pipe and is a sign of inefficiency. Older diesels also produce black smoke under "normal" conditions and this also a cause of unspent fuel, but mainly because of age.


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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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Black smoke is caused by the engine ~not~ burning all of its fuel. The most common cause of incomplete fuel burn is a clogged air filter, exhaust system (muffler) or injectors covered with carbon build-up. Another cause is too much fuel entering the engine to be burned due to either bad calibration or too heavy a load.


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A chalky gray is a good sign that evrything is running well. Heavy black soot would indicate a rich condition, not good.


What would cause a rough idle and heavy black exhaust in a 1991 Tercel?

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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