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Old 02-11-2011, 03:41 PM
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Join Date: Apr 2009
Location: Westchester, NY
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Default Misfire code cylinder 6

Within the last month and half i have been getting a check engine light on becasue of a misfire on cylinder 6. The code is P0306.

I ended up changing a few things. I went with the Taylor 82605 8.2MM spark plug wires. Spark plugs were autolite XP5245 and new acdelco ignition coil pack.

I did the plugs first about three months before i was getting the check engine light. Everything was fine then the misfire came up. Thats when i started troubleshooting. I then did the wires gave it a week and the light went off but Bang back on. I then went with the new ignition coil light goes off the next day a week later bang its on. I noticed its very cold around 10 degrees when the light comes on.

Now keep in mind if the light wouldnt have come on i wouldnt have been able to tell there was a misfire. The truck runs great no matter how cold or hot it is. I also ran seafoam through brake booster to see if that would help it. Once again i can only tell tha the light comes on when its cold but the trcuk no matter what runs smooth and great.

Any ideas would be greatly appreciated.

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Old 02-11-2011, 06:53 PM
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Join Date: Apr 2006
Location: KC, MO area
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Might try switching plug #6 w/ another one and see if the problem either goes w/ the plug or stays w/ the cylinder or goes away altogether.
2010 Sheer Silver Tahoe LTZ (all options but sunroof, power boards), GM (body color flaps, rear console, 3rd row mat, 2-Way Remote, chrome gas door, Esky rack), Eagle Eye LED tails, SLP dual tip exhaust, Silver bow-ties/rear wiper, Catch-All mats, AlphaTherm washer fluid heater, Putco chrome mirror covers, silver calipers, board chrome trim, tint, GMPP Major Guard

2007 Black Tahoe LTZ (Sold)
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Old 02-12-2011, 09:02 AM
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Join Date: Apr 2009
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I already did that. I switched plug 6 with plug 4 and also the wire and same issue. I think it's the autolite plugs. I'm going back to acdelco.

Last edited by Vinniety; 02-13-2011 at 12:23 PM.
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