Burnt ceramic on spark plugs

Burnt ceramic on spark plugs

A couple melted spark plugs - LS1TECH - Camaro and Firebird Forum Discussion

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Cylinder 1 Misfiring on a 2017 Chevy Spark, with lots of dark brown residue on the threads of the plugs : r/MechanicAdvice

Why is the ceramic part of a spark plug corrugated? - Quora