2003 FORD F-150 NUMBER FOUR CYLINDER MISS FIRING.

  • Tiny
  • mark robbins
  • 2003 Ford F-150
  • 5.4L
  • V8
  • 2WD
  • automatic
  • 130,000 miles

I changed out number four coil pack, changed all the spark plugs and cleared the code. It continued to miss fire and the light came back on, I took number three and number four coil packs and switched them out, cleared the code and still getting a miss fire on number four cylinder. I notice that number four fuel injector had a little corrosion. So I replaced the injector and the wire connectors still getting a miss fire. I am now thinking the plug and the coil pack may not be getting any fire. How do I check it and. What is your opinion, I am baffled.

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Tuesday, February 4th, 2014 AT 4:52 PM

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  • Tiny
  • hmac300
  • Expert
  • 44,295 posts

Misfires are very hard to diagnose even for a pro. About all you can do is check compression and if hta tis ok then have a pro doit as it can be a lot of things while driving your self completely nuts to fix it.

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Tuesday, February 4th, 2014 AT 4:58 PM

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