USNRET Posted September 16, 2016 Share Posted September 16, 2016 2003 Silverado SS 6.0. Original called out AC Delco platinums gapped at .060" TSB from 2008 changed to Iridiums @ .040". I went with the Iridums @ .040 and factory wires. 0300 code for multiple misfires, re-installed old wires with a 0303 and 0308 code. Re-installed original plugs which cleared the codes but has an idle stumble that wasn't there before. I cleaned the mass air flow sensor and that brought the idle speed up a little but still has pronounced idle stumble. I am going with .060 platinums and new factory wires again today. Using Bosch 1300 scanner. Weird part is that this was the first plug change since new and it had the .040 iridiums in it??? 150,000 miles. I see a little carbon tracking on the original wires. 3 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted September 16, 2016 Share Posted September 16, 2016 3 hours ago, USNRET said: Weird part is that this was the first plug change since new and it had the .040 iridiums in it??? 150,000 miles. Is this a coil pack or coil on plug? 2 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted September 16, 2016 Share Posted September 16, 2016 Have you had a crankshaft sensor relearn done yet? 2 Quote Link to comment Share on other sites More sharing options...
USNRET Posted September 16, 2016 Share Posted September 16, 2016 20 minutes ago, CECAA850 said: Is this a coil pack or coil on plug? Coil pack (square coil). I changed up a bit from the last post. I used AC 41-805 double platinums gapped at .050" and used the originally planned O'Reilly bought wires. I didn't care to spend $175 for the AC wires that had multiple misfires. Just got them installed and start / idle is promising. Picked up another 75 RPM (675) and has a smooth idle free and loaded. I'll drive it in a bit. Used some dielectric grease on the plug end keeping off the terminal. 2 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted September 16, 2016 Share Posted September 16, 2016 OK Mike, I can't find your original post. Let's start from scratch, ie bring me up to speed. Did you do the tune up to fix the misfire or did the misfire occur due to the tune up? 2 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted September 16, 2016 Share Posted September 16, 2016 That sounds promising! 1 Quote Link to comment Share on other sites More sharing options...
USNRET Posted September 16, 2016 Share Posted September 16, 2016 Rare, very rare, idle stumble originally which got much worse / constant after tune-up. Hope this does it although I would like to have a 2017 ZL-1 Camaro About the crankshaft relearn, I am old school with distributors and carbs. Would 150000 mile timing chain stretch warrant a position relearn? 2 Quote Link to comment Share on other sites More sharing options...
USNRET Posted September 16, 2016 Share Posted September 16, 2016 about ten to go for a rare toaster 2 Quote Link to comment Share on other sites More sharing options...
oldtimer Posted September 16, 2016 Share Posted September 16, 2016 Quick. distract Carl! 2 Quote Link to comment Share on other sites More sharing options...
USNRET Posted September 16, 2016 Share Posted September 16, 2016 Perhaps we should just chill until Tarheel come by to finish it...out See CCC thread 2 Quote Link to comment Share on other sites More sharing options...
oldtimer Posted September 16, 2016 Share Posted September 16, 2016 Carl, there's a flame war in 5.1 channel go there fast! They need a moderator (who doesn't try to hog all the toasters). 2 Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted September 16, 2016 Share Posted September 16, 2016 Mike, I just don't think plugs are the problem. 3 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted September 16, 2016 Share Posted September 16, 2016 Someone looking for me? 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted September 16, 2016 Share Posted September 16, 2016 32 minutes ago, USNRET said: About the crankshaft relearn, I am old school with distributors and carbs. Would 150000 mile timing chain stretch warrant a position relearn? Absolutely. 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted September 16, 2016 Share Posted September 16, 2016 Boom! 1 Quote Link to comment Share on other sites More sharing options...
oldtimer Posted September 16, 2016 Share Posted September 16, 2016 Go away. 1 Quote Link to comment Share on other sites More sharing options...
jimjimbo Posted September 16, 2016 Share Posted September 16, 2016 I am only interested if its a 4 holer, and not a 2 holer, toaster. 1 Quote Link to comment Share on other sites More sharing options...
oldtimer Posted September 16, 2016 Share Posted September 16, 2016 The one I won was a four. Oh look. I mean the one I just won. 3 Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted September 16, 2016 Share Posted September 16, 2016 Exactly! 3 Quote Link to comment Share on other sites More sharing options...
BigStewMan Posted September 16, 2016 Share Posted September 16, 2016 5 minutes ago, oldtimer said: The one I won was a four. Oh look. I mean the one I just won. when i was a kid, my grandma would put me on her knee and say, “a man can never have too many toasters." 3 Quote Link to comment Share on other sites More sharing options...
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