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How to Determine if Spark Plugs Are Damaged?

1 Answers

DelEsther

07/29/25 9:18pm

Methods to determine if spark plugs are damaged: 1. Start the engine and let it idle, then touch the insulating ceramic part of the spark plug with your hand. If the temperature rises quickly and significantly, the spark plug is normal; otherwise, it is abnormal. 2. Remove the spark plug and observe its color. If it is reddish-brown or rust-colored, the spark plug is normal. 3. If the spark plug is oily, it indicates a misadjusted spark plug gap, excessive fuel supply, or a short or open circuit in the high-voltage wire. 4. If the spark plug is covered in soot, it suggests the wrong heat range was selected for the spark plug, the air-fuel mixture is too rich, or there is oil leakage. 5. If the spark plug has black deposits, it indicates carbon buildup. 6. If the spark plug shows severe erosion, with the top scarred, black cracks, or melted electrodes, it means the spark plug is damaged.

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