Engine Misfires on cylinders?

Tiny
JACOBANDNICKOLAS
  • EXPERT
Are you getting power to the coil? If so, check cylender compression in that cylender. Let me know what you find.

Joe
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Thursday, November 12th, 2020 AT 8:56 AM (Merged)
Tiny
WRENCHTECH
  • EXPERT
If the engine can't let air out, it won't bring any in. If the engine doesn't breathe, it will not rev up at all. You can easily identify plugged exhaust using a vacuum gauge.
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Thursday, November 12th, 2020 AT 8:56 AM (Merged)
Tiny
GENE6210
  • MEMBER
I put in a new coil pack, but was still missing. Then I put in a new spark plug and seemed to still be missing. I left the car alone for a day or two and now it is running fine. Must have taken some time for the "brain" to readjust itself after running a few times.
Thanks for the answer though, because you were down the right path to getting it fixed.
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Thursday, November 12th, 2020 AT 8:56 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
I'm glad it's running good now. If you have questions in the future, let us know.
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Thursday, November 12th, 2020 AT 8:56 AM (Merged)
Tiny
JENNY12242
  • MEMBER
  • 1997 FORD EXPEDITION
  • 4.6L
  • V8
  • 4WD
  • AUTOMATIC
  • 250,000 MILES
My SUV has a misfiring on number eight. I have changed coil packs, plugs and wires. Before I changed coil packs it had random misfiring it would jump around from six to one to three to eight, after new coil packs only on number eight. Does anyone know what it could be? Also, I put new fuel pump.
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Thursday, November 12th, 2020 AT 8:56 AM (Merged)
Tiny
STEVE W.
  • EXPERT
Single cylinder misfire on a multiple cylinder coil usually indicates a problem with only that cylinder. In this case I would start by swapping the plug to a different cylinder on the other coil pack. Then swap the wire. It is not unlikely these days to have a bad part out of the box so swapping one at a time and seeing if the misfire follows the part is a way to test the parts that does not cost money.

If moving the parts does not change the miss then it has to be in the cylinder. Then I would run a compression test to make sure it is okay, if compression is good, the plug and wire test good, the likely suspect then is a partly plugged fuel injector.
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Thursday, November 12th, 2020 AT 8:57 AM (Merged)
Tiny
MIKE AKANA
  • MEMBER
  • 1997 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 12,500 MILES
I have had problems over the past several years with a nagging engine skip. Two years ago I had it in the shop for this miss and they determined it was bad plug wires. They changed the plugs and wires and it ran fine for 2-3K miles.

It developed a skip again and I put it into the same shop where they replaced one plug wire as bad. I think it was number 7. It ran fine for a few months but developed a skip once again.

I found a bad wire number 4 I think. The insulation looked like it was chaffed so I replaced it. It ran fine for a few more months and the skip is back again.

Weather seems to make it worse. Rainy days are worse that dry days and since there is no distributer cap I'm at a loss.

The check engine light comes on each time the miss is bad. I clear it by diconnnecting the battery.

I think there is another bad wire but think also that this fix is only a band-aid since the problem keeps reoccurring.

Is this an ignition coil problem? Can that make the plug wires fail? And is the coil the same thing as the coil pack or are they different things?

Any help would be appreciated.

Thanks
Mike
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Thursday, November 12th, 2020 AT 8:57 AM (Merged)
Tiny
MASTERTECHTIM
  • EXPERT
In my experience with this truck and ignition system is that if you do not use motorcraft spark plugs and plug wires this will happen. Mostly because they dont fit perfectly. If this truck came into my shop I would install the factory motorcraft plugs and wires before anything else. Hope this helps
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Thursday, November 12th, 2020 AT 8:57 AM (Merged)
Tiny
MIKE AKANA
  • MEMBER
Thanks for the input. I'll make the change, though I think that was done by the shop the first time. They had mentioned that the plug wires were not the proper ones for the truck. I bought it used in 2001 so I didn't know what was in it.

The wire I replaced it with was not a Motocraft wire however so it may be bad again.
Mike
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Thursday, November 12th, 2020 AT 8:57 AM (Merged)
Tiny
MIKE AKANA
  • MEMBER
Seems to have solved the problem.
Thanks
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Thursday, November 12th, 2020 AT 8:57 AM (Merged)

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