ASE A8 Practice Questions - ASE A8 Engine Performance Certification Exam

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A vehicle has a low power complaint. A vacuum gauge connected to the intake manifold reads 15 inches Hg at idle and drops to 5 inches Hg during acceleration. What is the most likely cause?

Normal engine operation Restricted exhaust system Worn piston rings Advanced ignition timing

Correct Answer:

Restricted exhaust system

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