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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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โˆ™ 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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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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