Asian/spark plugs 2 weeks ago VIDEO: Spark Plug Insulators And Flashover Share Tweet Print Email ImportCar Staff Writers,administratorView bio Bio Recent Posts Popular Posts Standard Motor Products Releases 245 New Parts For Standard And Intermotor BrandsCentric Parts Releases New Chassis Program GuideRotary Receives Additional Patent On Trio Three-Stage Lift ArmsFRAM Launches New Campaign With Jonathan Banks Of 'Better Call Saul'Check Out The April Issue Of ImportCar Magazine VIDEO: Spark Plug Insulators And FlashoverAudi: A New Seal On The BlockFiat: Unable To Add Engine OilWhen Do Control Arms Need To Be Replaced?Import Insights: Honda Announces First Plant In United States (1980) Andrew Markel shows the importance of keeping a spark plug’s insulators clean to prevent flashover. Sponsored by Denso. Gabriel Velazquez Flashover happens because the cop boot is crying uncle, and nobody ever sells customers new coil boots, because the industry has not made it a known serviceable item. Whenever you hear tune up these days, nobody mentions new coil boots, which usually fail long before a vehicle even needs spark plugs. I have seen them leave tracing in as little as 25k miles. You have to be an absolute slob to gunk up a plug enough where it would cause flashover. Some smudging on a plug will not do anything.