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Why would the porcelain on the number 4 spark plug crack a few days after being replaced each time on a Grand Prix 3.8 Supercharger?

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2004-11-04 10:16:47
2004-11-04 10:16:47

If it is above the metal part it is the installer. If it is below, it may be the wrong plugs or heat range.

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Right next to the supercharger


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