ASE A9 Light Vehicle Diesel Engines Practice Questions - ASE A9 - Light Vehicle Diesel Engines Certification Exam

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Technician A says blue exhaust smoke on a diesel usually indicates engine oil being burned. Technician B says black smoke usually indicates excess fuel or insufficient air. Who is correct?

Technician A only Technician B only Both A and B Neither A nor B

Correct Answer:

Both A and B

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