Question about Ford F-150

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When truck is stopped it idles low and sometimes shut off at red lights

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  • colleenmk82 Apr 22, 2009

    would it be connected to the doors locking by them selves when running when they did not before

  • colleenmk82 Apr 22, 2009

    2004 F150 4.6 L Engine

  • colleenmk82 Apr 22, 2009

    2004 F150 4.6L engine when stopped truck idles low and sometimes turns off at red lights

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  • Master
  • 326 Answers

Not an expert on this. I wanted to give you a suggestion, I saw your post coming up a few times.


In my humble experiences with Fords (I own five), I have only had issues with the TFI Modules and the MAP sensor(s). My 89 Bronco had issues like your experiencing, hesitation rough idle, stalling. I removed the TFI and replaced it with an old module and the issue was solved.

Most of the modular engines from Ford now place the TFI Module on the "Distributor" or on the fender wall. If mounted to the wall it appears a lot like a computer, it is fined in the same fashion.

While I am not sure if this will solve your problem, it is worth a shot. Especially if you find that your TFI is blackend or shows signs of heat exposure or is worn in anyway. I have also been aware of an issue with the Mass Air Meter vane collecting junk and throwing off the stoich. This can be remedied usually by just spraying some starting fluid on the vane while the engine is off, allowing a short time to dry before kicking it over to avoid any kind of backfire or detonation.


Please seek a second opinion on this but as I said, I just wanted to help.
TFI, MAP, or the MAF.

Posted on Apr 22, 2009

  • NitrusInc
    NitrusInc Apr 22, 2009

    Just double checked this. The older 4.6's actually used something different, and your model uses the PCM to control the spark. You'd need to plug it in to find that out I would assume, Again, second opinion highly suggested.

    Good luck friend.


  • NitrusInc
    NitrusInc Apr 22, 2009

    Oh yeah, and if you haven't had this experience... Most Auto-Zone's will hook your truck up to a scanner for free, just check your local shop see what the say. You should never have to pay for a scan at a reputable shop/store, but alas some do charge. Never hurts to ask though.

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  • Master
  • 15,935 Answers

Your idle is low.
Sometimes due to improper carb setting (you havent indicated the year).
Sometimes It is bad gas.
Sometimes it is failing alternator.

Please use the "Continue with this expert" option and reply with the year of your truck, the engine size, and if any warning lights are illuminated on your dash.

Thanks!!

Posted on Apr 22, 2009

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