altezzaclub Posted December 4, 2014 Report Share Posted December 4, 2014 So it was a combination of factors? Those plugs look average, with unleaded fuel they are always black & sooty around the outside rim and only the ceramic core shows any colour. having the fused ceramic build up on the side arm is what kills them I think, it will cover the spot where the spark jumps to. Quote Link to comment Share on other sites More sharing options...
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