What are the symptoms of spark plug carbon buildup?

1 Answers
Marie
07/23/25 11:39pm
Symptoms of spark plug carbon buildup include: engine idle shaking, difficulty starting the car, weak acceleration, and pungent exhaust fumes. In more severe cases, it can cause the valves to not seal properly, leading to a cylinder not working at all due to lack of cylinder pressure, or even sticking the valve so it does not return to position. In such cases, the valve and piston may interfere with each other's movement, ultimately damaging the engine. Spark plug carbon buildup refers to the residue of incomplete gasoline combustion at high temperatures adhering to various parts of the spark plug surface, forming a black substance. Carbon buildup is a major cause of various engine failures, so it is necessary to regularly clean the engine's carbon buildup.
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