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Old 12-28-2011, 08:29 AM
DaGuru373 DaGuru373 is offline
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Question 5.4L coil pack (coil over plug)

Hello club FTE. members.............
Im currently replacing my plugs boots springs and Ect.
What I want to know is if there is a specific resistance (Ohms) rating or a range that a good or acceptable coil should be at ?
I have checked 4 of the 8 at room temp. and all read 7 Ohms but does ANYBODY know specificly the acceptable number ?
Thank you..................Jc.
Thats checking from pin to pin on the connector btw...
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Old 12-28-2011, 10:57 AM
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Typically and in my experience with a known bad COP checking DC resistance isn't a reliable indication of anything. I've had known bad COP's check out just fine with a DVM.

The best way to test is either in operation---you'll notice a misfire or using sophisticated electronic diagnostic tools. While the vehicle is running carefully disconnect each COP from the wire harness to see if a noticeable change happens---if not the COP is good.

HTH
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Old 12-28-2011, 02:51 PM
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The newer engine computers that drive these cop systems are usually smart enough to detect a cylinder miss-fire, and will tell you which cylinder it is. It's true, a regular volt-ohmmeter doesn't have a high enough voltage to fully test the insulation integrity of the coils.
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