Quote:
Originally Posted by nubbzcummins
As in what kind of signs? Color looked good imo. Not wet/dry fouling noted. Ceramic body of plugs from hex head to maybe 1/4" toward top of plug was turning a burnt rusty brown color though. Coil side of hex not threaded end... Not sure if this is normal or sign of too much heat? Around 30k on oem ngk iridium plugs...
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The discoloration of ceramic body sounds normal. Were you want to look is the business end.
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