While having a discussion, Technician A says that typically, engine knock occurs under load. Technician B says that carbon knock can occur even when not under load. Who is correct?

Question

Quizplus · Accepted Answer

Engine knock typically occurs under load due to the increased pressure and temperature in the combustion chamber. Carbon knock, however, can happen even when the engine is not under load because it is caused by carbon deposits in the combustion chamber igniting before the spark.

While Having a Discussion, Technician a Says That Typically, Engine