Technician A says a push-in compression gauge must be held tightly in the spark plug hole in order to get an accurate reading. Technician B says the vent valve must be opened to release the pressure in the gauge after each cylinder is tested. Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because a push-in compression gauge must be held tightly against the spark plug hole to prevent air from escaping, ensuring an accurate reading. Technician B is correct because the vent valve on the gauge must be opened to release the pressure after testing each cylinder to reset the gauge for the next measurement.

Technician a Says a Push-In Compression Gauge Must Be Held