A dark exhaust from a running diesel engine...

A dark exhaust from a running diesel engine...

Question 1 of 27070

Q

A dark exhaust from a running diesel engine can be caused by __________.

A

late ignition

B

water in the fuel

C

high compression temperature

D

starting valve stuck open

Question 1 / 270705eccefa2bacbc34ba4d47b82

Question 1 of 270705eccefa2bacbc34ba4d47b82

A dark exhaust from a running diesel engine can be caused by __________.

Question 1 of 27070

Study area:

Study area:

Q

A dark exhaust from a running diesel engine can be caused by __________.

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🔍 Key Concepts

• diesel combustion process and what proper combustion looks like • causes of incomplete combustion in a diesel engine • difference between fuel problems vs. valve or timing problems

💭 Think About

• Which condition would lead to too much fuel or too little air being burned completely, producing soot and dark smoke? • Which options would more likely cause white or light-colored exhaust rather than dark exhaust? • How would late ignition vs. high compression temperature affect how completely the fuel burns?

✅ Before You Answer

• Match exhaust color (dark/black vs. white/gray) with typical diesel fault symptoms • Consider whether the fault would make combustion richer (too much fuel / not enough air) or leaner • Ask: does this problem mainly affect fuel quality, timing, or valve operation, and which of those is usually linked with sooty black exhaust?