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1994 Ford F-150 Base 117 WB

1994 Ford F-150
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March 7, 2013, 11:03 am

Tom C

Question: misfire problem

I recently replaced the spark plugs in my 2005 F-150 5.4 3v due to a sputtering problem on acceleration. The truck was running fine after that. I now have a misfire that came on all of a sudden. I stopped at a ford dealer that I was close to when it started and they diagnosed it as cyl 8 misfire. I replaced the coil pack and the fuel injector on that cyl and the prolem still exists. What else should I check?

March 8, 2013, 5:46 pm

Ron W
Expert Mechanic

Are they OEM factory plugs? If they are aftermarket plugs, you should replace them with OEM. I've sen alot of Fords have misfire issues with aftermarket plugs, even Bosch.

If they are OEM, a compression check is the next step.

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