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Old 08-15-2008, 03:05 AM   #1
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Is my coil pack bad?

I know coils packs fire two plugs at a time (1 & 4 and 2 & 3) but when a coil goes bad does it affect both plugs or can it affect just one? Reason why I'm asking is that one cylinder doesn't seem to be getting any spark even after I changed the spark plug cables. I checked the coil with my multimeter and both coils have about 15.5K ohms. I did notice that one of the terminals where the spark plug cable goes in (the dead cylinder) is kind of dark color while the rest are bright brass. Oh yeah, this is for a '03 2.0 SPI. Any info is much appreciated.


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Old 08-15-2008, 06:17 PM   #2
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UPDATE - I decided to just change the coil pack and hope for the best. Bought a Echlin coil from NAPA and installed it and, bingo, the engine runs so smooth at idle with no missing. I think that when I was checking the spark plug cables #2 had infinite resistance while the rest had about 5.5K ohms average. This probably overloaded the coil and made it go bad. But why just #2 cylinder beats the heck out of me. So it is possible for one cylinder to go bad even though the coil fires two at a time. Just thought I'd let everyone know.
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Old 08-15-2008, 07:27 PM   #3
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I had the same problem with my Focus a few months back. The ford Dealership couldn't figure out why cylinder #1 was misfiring and suggested I change out plugs, wires and coil pack for the low, low price of $725.00!!!!
I bought the parts at O'Reilly's for $132.00, and about 30 minutes later, she was running smooth as silk.
I am having a stumbling problem right now, but I think I have narrowed it down to either the PCV valve, or EGR valve.
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Old 08-15-2008, 07:43 PM   #4
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Thanks for the reply. I read somewhere else on the forum that the rubber elbow on the PCV tube where it connects to the intake manifold sometimes deteriorates and causes a vacuum leak causing a slight rough idle and stumble on acceleration. I paid $97 for my coil pack plus another $32 for the spark plug wires from NAPA and it was worth every penny just to fix this problem.
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Old 08-19-2008, 08:05 PM   #5
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I have already changed out the PCV hose. Mine was collapsed and sticky, but it wasn't the problem. I really think it is the PCV valve itself, and plan to change that ASAP. If that doesn't work, then the EGR is the next to be replaced.
The car runs fine, and mileage is good, and it really isn't a big issue, but it is driving me crazy that I can't seem to put my finger on it yet.
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