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Old 12-16-2005, 03:58 PM
Join Date: Dec 2005
Posts: 2

I have an 02 Ford F150 and it started to run rough between 30-60 mph. When I say rough I mean like you were on a chisel plowed field. As of this morning it is running rough at an idle and during acceleration, with no check engine light. I checked the cats and they are fine, any suggestions would help.
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Old 12-16-2005, 04:24 PM
Senior Member
Join Date: Nov 2005
Posts: 152

In most cases of running rough on the 4.6 and 5.4 a bad coil will give you those symptoms. When it's idling rough, unplug each of the ignition coils 1 by 1 and take note of the one that makes the least difference in idle. When you've found the misfiring cylinder, pull the coil and check the boot for signs of water contamination. Most commonly, #4 cylinder will have water/coolant contamination due to the heater hose connection above it leaking.

If the coil boot and spark plug hole is dry, swap that coil with one next to it and re-do the test I mentioned above. If it's the coil, the misfire will transfer over to the other cylinder.

Good luck
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Old 12-17-2005, 02:24 AM
Join Date: Dec 2005
Posts: 2

Thank you, you were exactly correct. It was the number 4 cylinder, I replaced the coil and the truck is running perfect.

Thank you again
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