Why is my truck misfiring?

Tiny
JONHARV2
  • MEMBER
  • 1997 FORD F-150
  • 204,200 MILES
My 1997 Ford F150 is misfiring. I've replaced the spark plug on cylinder 6 to attempt a fix (it needed replacing anyway), but it did not work. It only misfires about half the time. It will run normally, then misfire, then run normally. Only misfires under engine load or at 55 mph around 1500-1700 rpm. Any idea as to the problem?
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Sunday, October 14th, 2012 AT 7:30 PM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
You don't replace one spark plugs becaus if it is bad, others would be too.
It could also be the ignition coil, wires or the EGR syatem. Have you checked for trouble codes?
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Sunday, October 14th, 2012 AT 7:40 PM
Tiny
JONHARV2
  • MEMBER
  • 1 POST
No I haven't, my mechanic was out of town this past week. It has been misfiring for a few days now, but I have to have a vehicle. That's why I came on here, I don't have the equipment to read the fault codes.
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Sunday, October 14th, 2012 AT 9:15 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Autozone provides free scanning services.
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Sunday, October 14th, 2012 AT 9:55 PM

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