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Is It Normal for Spark Plug Ceramic to Turn Yellow?

1 Answers

Lincoln

07/30/25 12:22am

It is normal for the ceramic part of a spark plug to turn yellow. The functions of an automotive spark plug are: 1. To introduce the high-voltage electricity generated by the ignition coil into the engine cylinder; 2. To generate sparks between the spark plug electrode gaps to ignite the air-fuel mixture, ensuring normal engine operation. The procedure for removing an automotive spark plug: 1. Use compressed air or a fine hose to blow away dust and debris around the spark plug; 2. Ensure the engine is in a cold state before proceeding; 3. Immediately protect the spark plug installation port after removal to prevent debris or dust from entering the cylinder; 4. Avoid damaging the insulating ceramic body when using a wrench; 5. Do not bend or strike the center electrode when adjusting the spark plug gap.

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