How Do You Test Coils?

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Sho-N-Go

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I am the guy that told you to switch coils due to RF interference. This can cause lots of problems. The coil can actually be bad but not cause an engine miss. I would still recommend to have the coils stress tested with a Ford WDS system. I hope your problems have went away by now or you have resolved them. I remember when you switched them the MAF interference problem went away. I had a Lincoln LS in recently that would literally shut down the electronic throttle body system. Throw all types of ETC codes but it was RF interference from one coil pack. I have seen RF issues on Gen 3 Sho's as well. I hope this helps. feel free to email or pm me I will help where I can.
 

SHOGrabber

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I remember (it has been over a year ago & it is posted on here somewhere), I changed my coils around on the front (not new ones just moved them), after I moved them, I had all kinds of shifting problems, of all things. I would leave from a stop light and when the trans would try to shift into second, it wouldn't shift and when I would hit the gas, the engine would rev and fall, like it was on the rev limiter. It was strange. I would pull over, shut the car off, crank it back up and everything would be normal again. Someone on here said it was a bad coil making an interference with the shift module or something like that. Sounded weird, I moved the coils back to their original locations and the problem has never occurred again. Anyone ever have weird things like this happen from just moving coils around?

Maybe this is related also, maybe not.
Something else that I have going on. When the engine studders/skips, if the a/c is on sometimes it will kick the compressor off and I won't have cool air anymore until I cut the car off, turn it back on and it all works again. Also at night with the lights on, when the skip occurs, the lights will dim just a bit (interior and exterior), and also, my radar detector will chirp (it is hard wired into the fuse box) and the sub in the trunk will thump. Could a engine skip cause all of this? Or does it sound like toasted wires? I want to replace the weak coil that I found yesterday, but I just can't see all of this caused by a weak coil.
Bad diode in the alternator. Have it check on the car at Advance:thumb:
 

Funmart6

my name is mud
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Guys this post is pretty old now. I don't have any more engine miss issues anymore at all ever since I changed the plugs and sealed up any hairline cracks in the plastic part of the coil. This car is running and performing flawlessly again, doesn't skip a beat, (knock on wood). Thanks for all the input on this and maybe all this info will be helpful to other's with the same problem.:thankyou:
 

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