Technician A says that a power balance test is the best way to isolate the problem cylinder. Technician B says that a compression and cylinder leakage test can help determine the cause of the problem. Which technician is correct?
A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question

Quizplus · Accepted Answer

Both technicians A and B are correct.

Technician A is correct in stating that a power balance test is the best way to isolate the problem cylinder. During a power balance test, the engine's computer is used to cut out the fuel or spark to each cylinder one at a time, and the change in RPM is noted. If there is no change in RPM when a particular cylinder's fuel or spark is cut, it means that cylinder is not contributing to the engine's power output, indicating a problem with that cylinder.

Technician B is also correct in stating that compression and cylinder leakage tests can help determine the cause of the problem. These tests can help identify issues such as low compression, worn piston rings, leaking valves, or blown head gaskets - all potential causes of a misfiring or non-contributing cylinder.

Technician a Says That a Power Balance Test Is the Best