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Thread: Loping or Surging at Low RPM/Acceleration

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    Basic Member

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    Loping or Surging at Low RPM/Acceleration

    Hey all,

    My truck, a 2014 3500 with straight pipe, DEF/EGR delete & MM3 tuner, recently started to surge or lope but only when I'm accelerating normally or barely feathering the throttle.

    If I jump on it she runs fine. The delete was done almost 2 years ago which makes me wonder why it hasn't done this until now if it has to do with the delete.

    Any advice or help would be greatly appreciated.


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  3. Top Of Page | #2
    TexNeck's Avatar

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    Re: Loping or Surging at Low RPM/Acceleration

    With your MM3 go to menu and select change PID the percentage menu has the rail pressure items you’ll need.

    Select the rail pressure actual for one and rail pressure desired for another.

    Side by side is easier to monitor both- ideally they would match 100% - some variance is totally normal but there is a fine line between okay and too much.

    Usually about 1000psi difference or more i would think there is an issue/opportunity for improvement.

    Take a drive and look at values when symptoms occur and report back!

    2013 Ram 2500
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  5. Top Of Page | #3
    cumminsdieselfreak's Avatar

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    Re: Loping or Surging at Low RPM/Acceleration

    Quote Originally Posted by TexNeck View Post
    With your MM3 go to menu and select change PID the percentage menu has the rail pressure items you’ll need.

    Select the rail pressure actual for one and rail pressure desired for another.

    Side by side is easier to monitor both- ideally they would match 100% - some variance is totally normal but there is a fine line between okay and too much.

    Usually about 1000psi difference or more i would think there is an issue/opportunity for improvement.

    Take a drive and look at values when symptoms occur and report back!
    x2

    2018 Ram 2500 4x4 G56
    Romans 10:13

    See what we are up to on:
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    Or Email me at:
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  6. Top Of Page | #4
    Basic Member cwendel's Avatar

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    Re: Loping or Surging at Low RPM/Acceleration

    Also do the same comparison of the turbo actuator.

    That can cause the same issues at low power if it is sticking intermittently but not enough for a code.

    2013 2500 6.7 cummins crew cab. white and stock as can be
    If it were not for bad luck I would have no luck at all.

    using Tapatalk


  7. Top Of Page | #5
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    Re: Loping or Surging at Low RPM/Acceleration

    I went in and looked for the rail pressure but couldn't find it in the PID menu.


  8. Top Of Page | #6
    AK Bob's Avatar

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    Re: Loping or Surging at Low RPM/Acceleration

    Quote Originally Posted by Lucky2209 View Post
    I went in and looked for the rail pressure but couldn't find it in the PID menu.
    Scroll through the Pressure menu.


    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, 50 Gallon auxiliary fuel tank.

    Sent from my iPhone using Tapatalk

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. MM3 tuned by Double R Deisel. Oil Bypass Filter, 50 Gallon auxiliary fuel tank.

  9. Top Of Page | #7
    DIESELWRKS's Avatar

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    Re: Loping or Surging at Low RPM/Acceleration

    Just going to ask some basic questions.

    I don't know your background with a diesel or a Cummins but are you seeing any smoke out of the exhaust when this happens?

    How long has it been since you changed your fuel filter?

    Do you buy your fuel from the same place or a place that does high fuel turnover? In your area are you using winter blend fuel?

    The other thing is I don't know if you are from Michigan or this may be your first year in cold weather with a diesel.

    I have seen diesel's have fueling issues in really cold weather.

    2017 3500 68AUTO LB. DEMONICO RED
    Nitto 295/70/18 DRD , emission compliant. S&B dry CAI

    Justin
    Southern Oregon ( the Republican part)
    UNITEDSTATES MARINE CORPS 1993-2007
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