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Old 10-12-2007, 01:47 PM   #1
eddysemail
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1994 SL2
2000 L-Series 3.0L Sedan
Default Code P0300

I Went To Start My Car And It's Missing Bad!!!!!!!
Pulled Plugs Saw That One Was Fouled So I Replaced All Of Them. Put The System Back Together And It's Still The Same. I Scanned It And It Came Out With A Code P0300 Which Doesnt Help Me At All, I Already Know It Has A Misfire. Can Any One Help Me Out Here?
The Car Is A 2005 Ion2 Quad Coupe With 55,000 Miles On It. I Don't Dog It Out Or Anything Like That And I Perform All The Required Maintenance On Or Before It's Due.

Thanks,
Eddy

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Old 10-12-2007, 03:14 PM   #2
fdryer
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2003 L-Series 3.0L Sedan
Default Re: Code P0300

For an '05 Ion your car's still new to have anything worn out. Still under warranty? If so then bring it to Saturn for them to fix otherwise it would be worth pulling the plugs again, especially from the cylinder that fouled the first plug just in case that cylinder has a problem. If the second plug is fouled then you've isolated it to that cylinder for possible compression problems, a coil wire gone bad (simple swap with the other wires) with maybe an end terminal broken within the wire, or the coil needing wirebrushing if corroded from road salts. There's plenty of threads covering general misfires related to coil wires, plugs, and coils needing a good wirebrushing to clean up the ground contact surfaces and the coil towers. Look them up or search for misfire conditions.

...
*The CPS is the heart of the entire EFI system. No cps = dead EFI system*
*There's more to a/c than just a few cans of refrigerant*
*There's more to brakes than just replacing parts*

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