Original Video/spark plugs 2 months 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 109 New Parts For Standard And IntermotorRancho Extends Exciting Promotion On Lift Kits, Shocks Purchases Through SummerMitchell, Bosch Automotive Service Solutions Announce Collaboration To Deliver The Mitchell Diagnostics SystemMayhew Tools Launches New ProGrip Hook And Pick Product LineATEQ Announces New June TPMS Tool Software Updates Effectively Restoring Original Ride FeelNGK Hosts YANG Regional Meet-UpE-ZOIL Environmentally Friendly Hand Cleaner And Shop Wipes For TechniciansHunter Introduces Quick ID Vehicle Identification TechnologyMonster Introduces New 12V Ultra-Safe Lithium Ion Jump Starter 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.