2003 Ford Expedition Missing and hesitation

Tiny
FEC
  • MEMBER
  • 2003 FORD EXPEDITION
  • V8
  • 2WD
  • AUTOMATIC
  • 111,000 MILES
Service engine light came on code said miss fire on #3&6 reset and then only showed for #6 replaced coil & all 8 plugs also replaced fuel filter. Still has intermittent miss at 60 - 70 mph
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Monday, September 7th, 2009 AT 10:05 AM

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Tiny
JACOBANDNICKOLAS
  • CERTIFIED MECHANIC
Are you still getting a misfire at the same cylender or is it a different one? Also, did you replace all coil packs or just the two? Finally, did you check all of the plug boots on the coil packs (if the all weren't replaced) to make sure they are not arcking? I have see that cause a problem. The boot gets old and allows the ignition to arc on the valve cover.
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Thursday, September 10th, 2009 AT 12:08 PM

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