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3rd Class Power Engineering 3A2 Practice Exam

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When diagnosing an engine that stalls at a stop, Technician A says a dirty throttle body could be the cause. Technician B says an excessive vacuum leak could be the cause. Who is right?
Correct Answer:
Both A and B
Explanation:
Both a dirty throttle body (which restricts bypass airflow) and an excessive vacuum leak (which leans out the air-fuel mixture) can cause an engine to stall at idle.

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