Automotive Servicing NC I Practice Questions - TESDA Automotive Servicing NC I Competency Assessment Exam

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A diesel passenger vehicle emits heavy black smoke from the exhaust during acceleration. What is the most likely cause of this symptom?

An excessive amount of fuel relative to available air (rich mixture) due to a restricted air intake or faulty injectors. Coolant leaking into the combustion chamber due to a blown cylinder head gasket. Engine oil leaking past the valve stem seals or piston rings into the combustion chamber. The fuel tank containing a high concentration of gasoline instead of diesel fuel.

Correct Answer:

An excessive amount of fuel relative to available air (rich mixture) due to a restricted air intake or faulty injectors.

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