Black smoke from the exhaust pipe is usually caused by coolant mixing in the combustion chamber.

Name: Black smoke from the exhaust pipe is usually caused by coolant mixing in the combustion chamber.
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Question

Quizplus · Accepted Answer

Black smoke from the exhaust pipe is usually caused by a rich fuel-to-air ratio, which means too much fuel is being burned relative to the amount of air. Coolant mixing in the combustion chamber may cause white smoke or steam from the exhaust.

Black Smoke from the Exhaust Pipe Is Usually Caused by Coolant