ASE S2 Diesel Engines (School Bus) Practice Questions - ASE S2 - Diesel Engines (School Bus) Certification Exam

A school bus diesel produces excessive black smoke under acceleration but idles cleanly. The MOST likely cause is:

Coolant entering the combustion chamber Worn valve stem seals A failed cabin heater core Insufficient air for the fuel being delivered (over-fueling/low boost)

Correct Answer:

Insufficient air for the fuel being delivered (over-fueling/low boost)

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