ASE H2 Diesel Engines (Transit Bus) Practice Questions - ASE H2 - Diesel Engines (Transit Bus) Certification Exam

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Blue-gray smoke from a transit bus diesel exhaust, especially at startup and during deceleration, most likely indicates:

Engine oil entering the combustion chamber A rich air/fuel mixture Coolant in the cylinders Normal cold-start operation

Correct Answer:

Engine oil entering the combustion chamber

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