What are the signs of a faulty spark plug?

1 Answers
SanSienna
08/29/25 8:36am
The signs of a faulty spark plug are: 1. The engine produces a large amount of carbon deposits; 2. Difficulty in starting the car; 3. Excessive exhaust emissions; 4. Insufficient power; 5. Black smoke from the exhaust pipe; 6. Idle vibration; 7. Electrode melting and insulator turning white; 8. Electrode rounding and insulator scarring. The causes of spark plug failure are: 1. Severe carbon deposits or oil contamination on the spark plug; 2. Mismatched spark plug model; 3. Long-term idle operation of the engine; 4. Cracking of the spark plug insulator skirt; 5. Excessive spark plug gap; 6. Low insulation resistance of the spark plug; 7. Short circuit in the high-voltage wire.
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