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At what point should spark plugs generally be replaced?

1 Answers

NatalieLynn

07/30/25 6:11am

Severe erosion of spark plugs If the top of the spark plug is scarred, damaged, or the electrodes are melted or eroded, it indicates that the spark plug is damaged and should be replaced. Methods to determine if a spark plug is damaged: Remove the spark plug and observe its appearance to assess its condition based on the following color indicators. A normal spark plug will have a skirt and electrodes that appear gray-white, gray-yellow, or light brown. A properly functioning spark plug will have a skirt that is reddish-brown, with an electrode gap between 0.8-0.9mm and no signs of electrode burn. If the spark plug is contaminated with oil or deposits but is not damaged, it can continue to be used after cleaning off the oil and deposits. If the spark plug is severely damaged, showing signs such as scarring, black streaks, cracking, or melted electrodes, the cause of the damage should be identified. After troubleshooting, replace the spark plug with a new one. Additionally, if the spark plug appears black as if smoked, it indicates that the wrong heat range was selected or the mixture is too rich, with oil seeping up.

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