ASE X1 Practice Questions - ASE X1 Exhaust Systems Specialist Certification Test Exam

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An exhaust system has a noticeable 'puffing' sound at the tailpipe that pulses with engine RPM. Engine vacuum at idle is steady at 18 in-Hg. What is the MOST likely cause?

A leaking exhaust valve A pinhole leak in the muffler shell A burned valve or burned head gasket allowing exhaust into the cooling jacket A loose flange between the manifold and head pipe

Correct Answer:

A loose flange between the manifold and head pipe

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