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Spark plugs are changed because they wear out. There are three factors affecting the wear of a spark plug:
- The very high voltage electrical spark actually "wears off" the electrode metal, albeit only a very little each time it fires.
- The burning fuel, and combustion by products can erode/wear the electrodes.
- The combustion by products AND lubricating oil residue can build up on the electrodes causing the plugs to misfire
There may be some other reasons which don't come to my mind at the moment.
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∙ 14y ago
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