  Spark Plug Overheating
Detonation can cause vaporizing of metal in the cylinder, which will re-condense on the plug insulator in the form of tiny metal spheres. An overheated insulator will look chalk-white, and the electrode may be eroded.
Overheating can be caused by detonation from too much turbo boost, from improper plug tightening, or from too hot a plug.
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