Technician A says that low compression on an engine cylinder can be successfully compensated for by the PCM with no adverse effect on performance or emissions. Technician B says that the PCM and catalytic converter can mask or hide some basic engine defects. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Question

Quizplus · Accepted Answer

Technician A is incorrect. Low compression on an engine cylinder cannot be successfully compensated for by the PCM. Technician B is correct. The PCM and catalytic converter can mask or hide some basic engine defects. However, it is important to note that while the PCM may compensate for some issues, it will not fully fix them and can only do so to a certain extent. Additionally, relying on the PCM to mask engine defects can lead to further damage down the line.

Technician a Says That Low Compression on an Engine Cylinder