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F350 problem

Discussion in 'Ford Trucks' started by Frycztech, Jan 3, 2013.

  1. Frycztech

    Frycztech Junior Member
    from conn
    Messages: 14

    I have a 99 F350 5.4L
    It starts and runs good but when im driving and I let off the gas to cruise the truck surges between 1000 to 1500 rpms. when I give it gas its fine. Anyone have any clues?
     
  2. unhcp

    unhcp PlowSite.com Addict
    Messages: 1,245

    Strange, bad throttle sensor?
     
  3. Frycztech

    Frycztech Junior Member
    from conn
    Messages: 14

    Not sure there is no CEL or any codes im not sure where to start. Is there a way to test the tps?
     
  4. unhcp

    unhcp PlowSite.com Addict
    Messages: 1,245

    not really, it could be a list of things

    egr valve
    bad coils
    clogged fuel filter
     
  5. Frycztech

    Frycztech Junior Member
    from conn
    Messages: 14

    Ok I guess ill start with the pcv and fuel filter and see if that helps at all. Wouldn't a coil throw a code?
     
  6. unhcp

    unhcp PlowSite.com Addict
    Messages: 1,245

    funny story, I have had a lot of coils go bad in my past fords and actually I have never had them through a code. It could be a coil, does the truck buck at all?
     
  7. Frycztech

    Frycztech Junior Member
    from conn
    Messages: 14

    Nope no bucking at all. It plows fine I just notice in when i let off the gas to coast it surges up and down until I give it gas.
     
  8. unhcp

    unhcp PlowSite.com Addict
    Messages: 1,245

    Ok, probably not a coil, usually the truck will buck a little or shutter
     
  9. plowguy43

    plowguy43 PlowSite Fanatic
    Messages: 5,269

    Yes you can, you need a ohm volt meter. Turn the truck "On" not Run. Ground the volt meter and probe the signal wire. Turn the butterfly shaft gradually to wide open and watch to see if the volts climb smooth to 5 volts. If it jumps around then your TPS is bad.