My sled was running rough at idle 1100-1200 and would not adjust as idle was turned up. When I gave it a little gas it would run smooth but jump to 2000 but nothing between. I figured I might have fouled a plug so I changed them last night. Cylinders 1-3 looked great, cylinder 4 had the tip of the plug burned off almost back to to the bend. The electrode/porcelin looked good (maybe slightly darker). I'm assuming it slowly burned away but still put a magnet into cylinder to check for lose pieces but found nothing. I installed the plug and let the sled warm up and it still idles down to 1100-1200 with no response when idle is turned up. Could I have a bad plug cap or issue with a coil? Other then at idle the sled runs great, pulls strong and is smooth.
ApexerER
Expert
I have never adjusted my idle so I don't know how much difference it makes. I would have to guess and it is only a guess that if that cylinder got hot enough to burn the electrode off then it must be lean for some reason. Maybe try making that cylinder richer. You can always change it back if there is no difference.
LazyBastard
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Let me get this straight... it burned the plug, so you changed it and are just trying to run it like that? You're not ripping the head off and trying to figure out what damage it caused? You're not testing the injector to see if its plugged?
