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1997 peterbilt 379 Cruise control problems

Discussion in 'Peterbilt Forum' started by danwantstodrive, May 23, 2014.

  1. May 23, 2014 #1
    danwantstodrive

    danwantstodrive Light Load Member

    170
    60
    Feb 3, 2011
    connecticut
    0
    On my Pete with Detroit S60 12.7L I am having issues with the cruise control. When stopped and idleing the cruise works to increase RPM, But when I'm on the highway the cruise control does not work. Any ideas as to why this is?
     
    danwantstodrive, May 23, 2014
    danwantstodrive, May 23, 2014
    #1
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  3. May 23, 2014 #2
    damutt

    damutt Road Train Member

    1,126
    370
    May 6, 2013
    0
    i think i can anser that one, if you shut your truck off and DONT wait for the FULL gauge sweep (full right then full left) cruse wont work. if you wait for full sweep it will work. this works for me ona shaker with a 14L 60s
     
    damutt, May 23, 2014
    damutt, May 23, 2014
    #2
  4. May 24, 2014 #3
    danwantstodrive

    danwantstodrive Light Load Member

    170
    60
    Feb 3, 2011
    connecticut
    0
    Ya I wait like 5 seconds before I turn engine over.
     
    danwantstodrive, May 24, 2014
    danwantstodrive, May 24, 2014
    #3
  5. May 24, 2014 #4
    BeenJammin

    BeenJammin Light Load Member

    256
    118
    Dec 17, 2013
    0
    Does your fast idle kick out when you release the parking brakes? If not, check out your park brake switch. If it does, you need to hook to a monitor and run a switch configuration flow chart just to start, and from there, there's no telling where you'll wind up. Good luck.
     
    BeenJammin, May 24, 2014
    BeenJammin, May 24, 2014
    #4
  6. Apr 11, 2020 #6
    joey51y

    joey51y Bobtail Member

    1
    0
    Apr 11, 2020
    0
    I have a problem, I had a computer put on three times to turn cruise up it is set on a 100 mph and speed is set at a 100mph but it is still stuck on 65mph on cruise and 80 mph on throttle. I changed the speed sensor on the back of tranny. I’m lost need help anyone had this problem?
     
    joey51y, Apr 11, 2020
    joey51y, Apr 11, 2020
    #6
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