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Truck won't hold high idle?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by RERM, Aug 11, 2016.

  1. Aug 11, 2016 #1
    RERM

    RERM Road Train Member

    1,683
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    Dec 13, 2012
    Chicago, IL
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    As I sit here it's 95degrees, and as I freeze in my AC cooled cab, my truck came down from 900 rpm to normal idle.....I bumped it up again, and after about a minute or two, it came back down...,.any ideas????

    Oil temp, water temp and oil pressurevare all normal.......
     
    RERM, Aug 11, 2016
    RERM, Aug 11, 2016
    #1
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  3. Aug 11, 2016 #2
    Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    Clutch pedal vibrating, on off switch partially shorted, sticky park brake sensor or brake application sensor. Anything that can cancel cruise can also cancel high idle setting.
     
    Heavyd, Aug 11, 2016
    Heavyd, Aug 11, 2016
    #2
    BoxCarKidd, j_martell and SAR Thank this.
  4. Aug 11, 2016 #3
    RERM

    RERM Road Train Member

    1,683
    1,124
    Dec 13, 2012
    Chicago, IL
    0
    Well, I changed out the clutch return spring last week, so maybe a sensor???
     
    RERM, Aug 11, 2016
    RERM, Aug 11, 2016
    #3
  5. Aug 11, 2016 #4
    Roberts450

    Roberts450 Road Train Member

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    Feb 6, 2016
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    Yea check that sensor. My pete was doing that and the cutting out the jake unless I pulled up on the clutch. Found the mounting screws had come loose for the switch under the cab.
     
    Roberts450, Aug 11, 2016
    Roberts450, Aug 11, 2016
    #4
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