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CM 870 Acting strange in cold temps

Discussion in 'Trucks [ Eighteen Wheelers ]' started by peterblt, Mar 18, 2014.

  1. Mar 18, 2014 #1
    peterblt

    peterblt Bobtail Member

    19
    3
    Sep 24, 2011
    0
    In frame was done less than 50k.Truck changes tone and I lose about 10lbs boost and the pyro spikes upwards of 900-1000 deg.Sometimes it will stay there sustained(pyro temp) other times it only happens for 5 miles or so then it pulls out of it if you will.It all started when it started getting cold here in the Northeast back a few months.The colder it is outside the more it happens.Turbo, most all sensors and even tried a different ecm? No CEL either.Anyone here or experience anything like this?
     
    peterblt, Mar 18, 2014
    peterblt, Mar 18, 2014
    #1
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  3. Mar 18, 2014 #2
    peterblt

    peterblt Bobtail Member

    19
    3
    Sep 24, 2011
    0
    Charge air is new also.
     
    peterblt, Mar 18, 2014
    peterblt, Mar 18, 2014
    #2
  4. Mar 18, 2014 #3
    jameslawton

    jameslawton Light Load Member

    257
    65
    May 1, 2013
    Tulsa OK
    0
    Get the truck plugged in and see what the atmospheric presser and outside temp gauges say I would guess one of them is wrong
     
    jameslawton, Mar 18, 2014
    jameslawton, Mar 18, 2014
    #3
  5. Mar 18, 2014 #4
    peterblt

    peterblt Bobtail Member

    19
    3
    Sep 24, 2011
    0
    The ambient air temp sensor has been replaced is this any relation? I'm thinking I have a short or something in the wiring.About the only thing that hasn't been replaced is the main engine wiring harness.
     
    peterblt, Mar 18, 2014
    peterblt, Mar 18, 2014
    #4
  7. Mar 18, 2014 #5
    jameslawton

    jameslawton Light Load Member

    257
    65
    May 1, 2013
    Tulsa OK
    0
    If it was a broken wire it would turn on check engine light if you changed the ambient air temp and no help it might just need a ecm update but I like to know what the atmospheric presser was reading
     
    jameslawton, Mar 18, 2014
    jameslawton, Mar 18, 2014
    #5
  8. Mar 18, 2014 #6
    peterblt

    peterblt Bobtail Member

    19
    3
    Sep 24, 2011
    0
    Don't know what the pressure was reading I do know we have tried a different ecm from a fleet truck with no change.
     
    peterblt, Mar 18, 2014
    peterblt, Mar 18, 2014
    #6
  9. Mar 18, 2014 #7
    jameslawton

    jameslawton Light Load Member

    257
    65
    May 1, 2013
    Tulsa OK
    0
    Check the turbo make sure it adjusts no sticking points but your proply going to have to plug into computer and do some checks
     
    jameslawton, Mar 18, 2014
    jameslawton, Mar 18, 2014
    #7
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