Question

during a cylinder power balance test, when a cylinder that is not operating correctly is disabled, it:
select one:
a. produces a large rpm drop.
b. does not produce much, if any, rpm drop.
c. produces the same rpm drop as when disabling a correctly operating cylinder.
d. will not be compensated for by the pcm.

Explanation:

A cylinder power balance test checks each cylinder's contribution to engine power. A non - operating cylinder doesn't produce much power. When disabled, since it wasn't contributing much (or at all) to the engine's power output (measured by rpm), there won't be a significant rpm drop. A correctly operating cylinder contributes to engine power, so disabling it causes a noticeable rpm drop. The PCM (Powertrain Control Module) compensation is not relevant to the rpm drop caused by disabling a non - operating cylinder in terms of the basic principle of the power balance test (which is about power contribution of the cylinder).

Answer:

b. does not produce much, if any, rpm drop.