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Old 09-18-2008, 11:40 PM   #1
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Arrow Changed the Coil Packs - Now Code PO303

Tried to change just one pack but that was only an incremental improvement so I changed them all, since I had been receiving a random misfire code. Much improved but still throwing a code PO303 but now it is specific to cylinder 3 which now gets me down to either a fouled plug, a bad wire or a dirty injector. Will address that tomorrow along with some other issues.

Did some scans and LTFT'* are still going as high as 16.4 on any deliberately brisk throttle application, although the STFT'* only fluctuate between maybe -3.5 though +5. They all drop to 0 on 0 throttle which is better than I was doing with the previous engine.

If it doesn't rain tomorrow maybe I can give the engine some more attention like the supercharger fluid, thermostat mod, change out the fuel filter, etc.
Any suggestions or comments are appreciated.

Last edited by peace; 09-18-2008 at 11:53 PM.
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Old 09-19-2008, 09:03 AM   #2
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Agreed on checking the plug, wire and also check that coil post. I've actually had a single post go bad.
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Old 09-19-2008, 05:01 PM   #3
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Found out it was a broke plug
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Old 09-19-2008, 05:08 PM   #4
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Wow, last time i saw one of those plugs was when i was spraying. Were you spraying?
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Old 09-20-2008, 01:09 AM   #5
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Its an AC Delco Iridium, I don't understand the spraying part, please clarify?
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Old 09-20-2008, 01:22 AM   #6
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Spraying as in Spraying NOS!!
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Old 09-20-2008, 01:22 AM   #7
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i know is a AC Delco plug
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Old 09-20-2008, 08:28 AM   #8
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Thanks I just learned something, kewl. At first I thought you were referring to some kind of gardening operation as people like to tease me because I like Champion sparkplugs.

Last edited by peace; 09-20-2008 at 08:30 AM.
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