Practice question

What does dense black smoke coming from a diesel engine's exhaust pipe usually indicate?

  1. The engine is burning coolant fluid
  2. Incomplete combustion of fuel due to a clogged air filter or faulty fuel injectors
  3. The engine oil level is extremely low
  4. The vehicle is using the correct grade of diesel fuel

Answer: B — Incomplete combustion of fuel due to a clogged air filter or faulty fuel injectors

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