Compression test results are being discussed. Technician A says that if one cylinder is found to be low, a wet test should be performed to help narrow down the diagnoses. Technician B says that a difference of 10% between cylinders would be acceptable.
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because performing a wet test (adding a small amount of oil to the cylinder) can help determine if the low compression is due to worn piston rings or other issues. Technician B is also correct as a general rule of thumb in the automotive industry is that a 10% variance between the highest and lowest compression readings across cylinders is typically considered acceptable.

Compression Test Results Are Being Discussed