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P0307 & P0357 error codes

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Old Jul 15, 2014 | 11:04 AM
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St. Jude Donor '06-'10-'11
Default P0307 & P0357 error codes
So the beauty decided to throw a little hissy fit after a dyno day.
Engine running rough and the afore mentioned codes, that refer to cylinder #7. Also getting Service Active Handling on DIC
What I have done so far: checked the plug wire, looks ok but resistance is ~770 ohms. I have a set of MSD plug wires and they measured only ~28 ohms. My thought right now is a bad plug wire. But I don't know what is normal R for stock wire. Anyone know? Plus I'm thinking of just swapping out the MSD's with the stock wires. I mean 28 vs 770 has got to be better. Right? At least in the electrical world.
I did pull the plug and I think it looked ok. 15k miles on a NGK TR7ix.

I pulled the codes with my Inovo Scan tool but could not clear them. Is this something I have to pull a battery cable for 5-10 min, to clear?

Thanks
Kelly
Last edited by BAMAGOLFER; Jul 15, 2014 at 11:07 AM.
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Old Jul 15, 2014 | 11:21 AM
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How old is the battery?
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Old Jul 15, 2014 | 11:30 AM
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St. Jude Donor '06-'10-'11
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Originally Posted by timd38
How old is the battery?
less than a year.
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Old Jul 15, 2014 | 11:37 PM
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Check the plug, swap the wire with another cylinder, swap the coil with another cylinder. See if the missfire moves to donor cylinder.
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Old Jul 16, 2014 | 08:47 AM
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St. Jude Donor '06-'10-'11
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Thanks GMTech! I will try that this evening.
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Old Jul 21, 2014 | 09:02 AM
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St. Jude Donor '06-'10-'11
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A little update cause I know y'all are losing sleep over this.
Replaced all plugs and plug wires. Car is running smooth and no codes!

Thanks for the help and suggestions.

Kelly
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