Cummins n14 idling too high

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Turbodre, Jan 27, 2015.

  1. Turbodre

    Turbodre Bobtail Member

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    Jan 27, 2015
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    Hi Guys,
    I have a 1994 International with a n14 cummins Celect.
    my problem with it is, when it starts in the morning it idles on at 700rpm but when it warms up the idles goes to 900rpm
    Can anyone say what may be causing this?

    Thanks in advance

    P.S i have no problem starting, i have no missing with the acceleration. it just idles really high when its warmed up.
     
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  3. cdub304

    cdub304 Light Load Member

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    Dec 7, 2009
    Rockford,IL
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    when is the last time you changed the air filter, what kind of fuel filter do you have, does your cruise work? have you ever had any rack work?
     
  4. Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    Sounds like the throttle may not be going to full idle. Make sure there isn't a bunch of mud jammed at the bottom of the pedal. After that you will have to get Insite hooked up to see what the ECM is seeing for throttle % and go from there.
     
  5. PurplePete

    PurplePete Light Load Member

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    Nov 15, 2011
    Tyler, Mn
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    My n14 could be set to idle high by toggling the cruise control, you may have tapped it and set it unaware that you had.
     
    magoo68 Thanks this.
  6. Turbodre

    Turbodre Bobtail Member

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    Jan 27, 2015
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    Thanks for your reply guys
     
  7. Turbodre

    Turbodre Bobtail Member

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    Jan 27, 2015
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    The Air filter its due changing just about now; however, the idle was like that even when the air filter was new. i use fleetguard fuel filter, never done any rack work since i have had it (2years)
     
  8. Turbodre

    Turbodre Bobtail Member

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    Jan 27, 2015
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    There is no mud under the pedal, it moves freely all the way up and down. Intend to get insite hooked up but they are changing an arm and a leg to do it here (Jamaica) so i am just trying to see if there is anything that could maybe solve the problem without going that route
     
  9. Turbodre

    Turbodre Bobtail Member

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    Jan 27, 2015
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    The cruise control switches will increase the idle when its cold and idling normal but when its warmed up and running high, the cruise control can not bring it down
     
  10. Heavyd

    Heavyd Road Train Member

    7,625
    6,023
    Feb 4, 2009
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    Try wiggling the wiring harness around the ECM and the main harness that goes up and over the engine to the right side of the firewall. May have a short in the throttle pedal wiring.
     
  11. Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,640
    Oct 11, 2010
    Borispol, Ukraine
    0
    check fuel rate with Insite software (how many l ore gal per hour)?

    If lower 1 l/h - (0.25 gal/h) - injectors are worn, usually worn nozzles.
     
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