Testing for a restricted exhaust system using a vacuum gauge is being discussed. Technician A says this test should be performed at idle only. Technician B says that high vacuum on the gauge during all phases of the test indicated a restricted exhaust. Who is correct?

Question

Quizplus · Accepted Answer

Testing for a restricted exhaust system with a vacuum gauge involves observing vacuum readings at various engine speeds, not just at idle. Additionally, a restricted exhaust typically causes low vacuum readings during acceleration, not high vacuum readings during all phases of the test.

Testing for a Restricted Exhaust System Using a Vacuum Gauge