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Cummings ISX 2005 constant high idle

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Leon Nicholes Jr, Sep 26, 2018.

  1. Sep 26, 2018 #1
    Leon Nicholes Jr

    Leon Nicholes Jr Bobtail Member

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    Sep 26, 2018
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    What would cause it to run at high idle all the time?
     
    Leon Nicholes Jr, Sep 26, 2018
    Leon Nicholes Jr, Sep 26, 2018
    #1
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  3. Sep 26, 2018 #2
    dmkberger

    dmkberger Bobtail Member

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    Sep 26, 2018
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    Leon, my guess would be a vacuum leak somewhere in the intake. I've been out of the field for a while but this is my best guess. Hope that helps.
     
    dmkberger, Sep 26, 2018
    dmkberger, Sep 26, 2018
    #2
  4. Sep 26, 2018 #3
    pushbroom

    pushbroom Road Train Member

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    Sep 1, 2012
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    What is high idle? How fast?
    Vacuum leak is more of a gas thing. 2005 isx idle speed will be controlled by the ecm.
     
    pushbroom, Sep 26, 2018
    pushbroom, Sep 26, 2018
    #3
    Goodysnap and spsauerland Thank this.
  5. Sep 26, 2018 #4
    dmkberger

    dmkberger Bobtail Member

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    Sep 26, 2018
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    Yeah, I thought of that later and just didn't come back to fix the post. Thanks for the refresher...
     
    dmkberger, Sep 26, 2018
    dmkberger, Sep 26, 2018
    #4
    pushbroom Thanks this.
  7. Sep 27, 2018 #5
    Heavyd

    Heavyd Road Train Member

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    Check for a stone or mud or something jammed under the throttle pedal.
     
    Heavyd, Sep 27, 2018
    Heavyd, Sep 27, 2018
    #5
    AModelCat Thanks this.
  8. Sep 27, 2018 #6
    shoe128

    shoe128 Bobtail Member

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    Jun 30, 2018
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    Depends on what you call high if it's
    7-800 it's sounds like it's Ina Regen mode my isx15 .2016 does it allows
     
    shoe128, Sep 27, 2018
    shoe128, Sep 27, 2018
    #6
  9. Aug 15, 2019 #7
    tallmon

    tallmon Medium Load Member

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    Oct 22, 2014
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    Did you ever figure out the problem? I have a 2007 idling at about 750.
     
    tallmon, Aug 15, 2019
    tallmon, Aug 15, 2019
    #7
  10. Aug 18, 2019 #8
    ClineER

    ClineER Light Load Member

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    Apr 27, 2016
    N.E. Oklahoma
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    Turn cruise off and push acceleration or resume to change idle speed. If turned on in programming allows you to change idle from 600 to 900 rpm.
     
    ClineER, Aug 18, 2019
    ClineER, Aug 18, 2019
    #8
    tallmon Thanks this.
  11. Sep 2, 2020 #10
    Bobby/Ronda

    Bobby/Ronda Bobtail Member

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    Sep 2, 2020
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    My 2011 isx Cummins is idling high
    No road power pulling load
    Any help for this
    I already changed the tps foot pedal assembly
     
    Bobby/Ronda, Sep 2, 2020
    Bobby/Ronda, Sep 2, 2020
    #10
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