Truck goes into limp mode

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Tammy6529, Nov 11, 2019.

  1. Tammy6529

    Tammy6529 Bobtail Member

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    Nov 11, 2019
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    2000, 466e 4900. Cold start unless you plug in even in summer. Once is warmed up, going down road can get to about 45 and warn engine light comes on and it goes into limp mode. Shut engine off and start back up it resets . But once get back up to about 45 it goes back to limp mode. Engine never dies just no throttle. Installed new throttle sensor, replaced oil sending unit, checked all wires to starter, cleaned all battery cables . Any ideas? HELP
     
  2. FoolsErrand

    FoolsErrand Road Train Member

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    Dont throw any more money at it. Bring it to someone with international specific diagnostics. A computer doesnt go limp without storing codes thatll lead you to the real issue.
     
    truckdriver31 Thanks this.
  3. x1Heavy

    x1Heavy Road Train Member

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    White County, Arkansas
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    Check fuel for algae in bottom. Check fuel for toasty warm tanks that says engine is returning SOME fuel to both of them as it should. Check for signs of gelling a form of jelly in the fuel

    Have the shop find the codes related to computer alarm and limp modes it should still be stored in memory. Hopefully they have a dyno as well so they can MAKE the tractor get lazy and weak. Maybe then they find the real problem.
     
    truckdriver31 Thanks this.
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