2006 Freightliner jerking when engine is warm

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Reggiesseptic, Feb 20, 2019.

  1. Reggiesseptic

    Reggiesseptic Bobtail Member

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    Feb 20, 2019
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    my dad's 2006 Freightliner starts jerking when it's going down the road once the engine warms up when it's cold and runs fine but once it warms up around eight miles down the road it starts jerking kind of like a surge can anyone tell me what it is we replace the throttle position sensor someone told us that might be it but it's still doing the same thing any help on this matter would be greatly appreciated thank you
     
  2. secorp

    secorp Light Load Member

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    Jan 16, 2013
    Lakeland Florida
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  3. Working2party

    Working2party Medium Load Member

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    What engine, does it have after treatment? A 2006 shouldn’t, but want to make sure.

    Is a surge, jerk, or is it pulsing like a miss?

    Is there any chance you know what the engine temp is when it starts? Or is it at 180 -200 deg a couple miles before it starts?
     
  4. spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    Sounds like an ACERT...
     
    fss99701 and SAR Thank this.
  5. Deere hunter

    Deere hunter Light Load Member

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    I’d be willing to bet it’s a fuel pressure problem not keeping sufficient fuel in your injector cavities so either your supply pump is getting weak or the pressure regulator on your return fuel line is getting weak !! It would help if you had a fuel pressure gauge ! But I’m totally assuming this is a cat !
     
  6. Easy_Money_Trucker

    Easy_Money_Trucker Bobtail Member

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    Feb 12, 2019
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    I jerk in my Freightliner Cascadia if it's warm in the cab and I don't have the cash for an escort.
     
  7. fss99701

    fss99701 Medium Load Member

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    had a caterpillar on a Kenworth totally different animal kind of doing the same thing we took it to Kenworth after $5,000 of unneeded work a shade tree mechanic said it was the low pressure fuel pump and he was right. I guess I'm calling it by its right name the pickup pump whatever the proper name for it is, it was pretty inexpensive and it ran great after that.
     
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