Technician A says that an engine that idles rough due to burned valves might run fine at speeds above idle. Technician B says that carbon buildup in a combustion chamber can cause an engine to have higher compression. Who is right?
A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because an engine with burned valves may not seal properly at low speeds, causing rough idling, but at higher speeds, the faster movement of air and fuel can compensate for the leak, allowing the engine to run smoother. Technician B is correct because carbon buildup in the combustion chamber can effectively reduce the chamber volume, leading to higher compression ratios, which can increase compression pressure.

Technician a Says That an Engine That Idles Rough Due