zim Posted July 3, 2011 Share Posted July 3, 2011 Morning, Recently my truck has been acting like a v7. Which is quite embarressing as our other v8's on standard ingnition all run as v8's LOL ! So put a timing light on each coil lead and found that #5 was a bit hit n miss. Took the plug out, put a new one in and ran fine. Tested the plug out the engine and instead of sparking across the electrode it was sparking inside the plug :huh: They're not that old, about 5 or 6 events ? But have been swimming. Any thoughts as to why this happens ? Guess it'll be a plug change for next weekend..... G Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 3, 2011 Share Posted July 3, 2011 Yep, had this happen, oddly not on a Rover V8 that had been swimming, but on a Lexus V8 on stanard ignition parts, and my Audi, and.... my lightweight -there was a hairline crack in the insulator allowing the electricity to escape. You can normally spot them more easily if you rub the insulator with a grubby mitt/rag for a while, the crack shows up as a darker line than the rest of the cone. Quote Link to comment Share on other sites More sharing options...
bishbosh Posted July 3, 2011 Share Posted July 3, 2011 It is possible shock loading from being dunked caused the ceramic to crack. Could also have been duff from the outset.... Quote Link to comment Share on other sites More sharing options...
stuck Posted July 20, 2011 Share Posted July 20, 2011 Stop fitting the HT leads with a hammer Quote Link to comment Share on other sites More sharing options...
zim Posted July 20, 2011 Author Share Posted July 20, 2011 Errr...how else are you supposed to fit them Quote Link to comment Share on other sites More sharing options...
dirtydiesel Posted July 20, 2011 Share Posted July 20, 2011 I'd be suprised if it's a faulty ngk plug. We fit litrally thousands a year and i think i've only ever had one fault straight out of the box, Most of the ignition faults we see are down to champion or bosch plugs burning out coil packs or coil drivers in ecu's. Quote Link to comment Share on other sites More sharing options...
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