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Old 09-16-2012, 09:50 AM   #1
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2003 SPI Misfire

My daughter's Focus has been having intermittent misfiring at around 45mph when accelerating. Then a couple days ago the MIL started flashing and registered a 0302 and 0316 code. It seems to get worse when accelerating.

I replaced the crankshaft position sensor but the miss is still there. I am going to replace the plugs and wires, but I'm not sure where to go from there if that doesn't fix the problem.

Any thoughts, hints, suggestions would be greatly appreciated!!


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Old 09-16-2012, 01:30 PM   #2
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haven't looked up those codes yet, just thought I'd mention first that the plugs & wires certainly won't hurt 7 you should take a CLOSE look at the coil and it's wiring while you're at it.

On single coil Focus's, removing the coil & checking the base for cracking solves many issues with similar symptoms if cracks are found, the wiring issue is less common for a particular speed range.

luck!
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Old 09-16-2012, 05:54 PM   #3
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Well, it seems I've got the miss fixed. The #2 plug wire had infinite resistance and the plug was wet with gas so that was my miss.

It still has a rough idle and seems to stumble on takeoff. Any thoughts on that?

Thanks,

Gary
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Old 09-16-2012, 06:54 PM   #4
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This is the coil end of the bad plug wire. Should I be concerned that the coil has been damaged?

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Old 09-17-2012, 01:25 PM   #5
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Think I finally got it resolved. Pulled the coil today and the #2 tower was burnt pretty bad and there were several cracks in the coil. Replaced the coil and it is idling great and the shudder is gone!!
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