Question about 2005 Ford F-150

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05 f-150 5.4L 3v missfire on take off (light throttle)

No codes Coil or Injector??

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  • auto dr Jul 04, 2008

    have snap-on w/can

  • auto dr Aug 15, 2008

    Truck has aprox. 10k on fact replaced crate motor 89k total. on take off w/2" depression of gas petal their is a rapid pulse vibration . Feels like a coil missfire (cop) 300HP 3valve 4x4 auto.17" alum.wheels (stock) no mods. all fluids replaced w/synthetic 1 bottle of motor craft LSD additive in ea. diff. I have snapon 2500 scaner w/can adapter also vantage pro. no missfire codes have ever come up as well as no freeze frame data. Ford dealer installed eng. was returned 700mi no power. ford replaced Fuel pump & Filter. then found prob. w/head. since plenty of power avg.aprox. 17mpg can feel eng. skip ocasionaly at idle too.

  • nukem107 Oct 26, 2008

    i have the same truck it has 78k on original motor but it keeps missfiring i had the # injector replaced and all the spark plugs replaced and it still does it the ford dealer doesnt know whats going on with it. can someone help me.

  • tsd98 Nov 03, 2008

    My 2005 F-150 5.4 has the same misfire above 3000 rpm. Have replaced fuel pump, all injectors, some coils and a couple plugs to no avail. Need help desperately. Dealer can't find problem.

  • steve452 Jan 21, 2009

    Having the same problem. I took it into the shop, and of course on the way the check engine light went off and everything was fine. Next day on the way to the office it starts again. Seems to go away when I press the gas, or when let go of the gas and cruise. Today was the first time that it occured over 40mph, as before it only happened below 40.
    The dealership has no idea and as they cleared the codes and test drove it and nothing happened.



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I took mine to the dealer. They replaced some plugs and updated the software for the truck. It has been running just fine since then. Give that a shot, it is a lot less expensive then having everything else done and then finding this solution out.

Posted on Feb 03, 2009

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Could u please be more specific about the problem??

Posted on Aug 02, 2008

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I would strongly suggest checking the Carbon cannister for water getting in through the breather tube. I have had ( and do have ) the same problem and it was diagnosed water getting into the tank. If the vent gets placed in a bad area of the truck, which most of them are right up near the spare tire. then they will collect water in the tank.

Posted on Feb 03, 2009

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