Black smoke exhausting from a diesel engine...

Question 1 / 205eccefa2bacbc34ba4d47b7e

Question 1 of 205eccefa2bacbc34ba4d47b7e

Black smoke exhausting from a diesel engine may be caused by __________.

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Question 1 of 20

5eccefa2bacbc34ba4d47b7e

Black smoke exhausting from a diesel engine may be caused by __________.

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🔍 Key Concepts

• diesel engine combustion and air-fuel mixture • effects of restricted air flow vs. restricted fuel flow • color of exhaust smoke and what it indicates about combustion

💭 Think About

• Think about what black smoke usually means about how completely the fuel is burning inside the cylinders. • Ask yourself: which option would make the mixture too "rich" (too much fuel for the air available) and lead to incomplete combustion? • Consider which listed problems would reduce the amount of air getting into the engine, and which would reduce fuel.

✅ Before You Answer

• Black smoke typically indicates unburned or partially burned fuel in the exhaust. • Identify which choice would most likely reduce the air supply to the cylinders, not the fuel supply. • Eliminate any option that would improve scavenging or air flow, since that would usually reduce, not increase, black smoke.

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Question 1 of 20

Black smoke exhausting from a diesel engine may be caused by __________.

excessive scavenging air pressure

high coolant temperature

insufficient fuel

a clogged air cleaner

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