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High Altitude!

Discussion in 'Freightliner Forum' started by brknwng, Aug 13, 2014.

  1. Aug 13, 2014 #1
    brknwng

    brknwng Bobtail Member

    39
    4
    Apr 21, 2014
    0
    I have my own ideas about this but, want to see if I'm anywhere close to correct! When at high altitude [5000 ft above sea level and better] my truck runs great but at sea-level it's sluggish. Any ideas? I'll add that all filters are new etc!
     
    brknwng, Aug 13, 2014
    brknwng, Aug 13, 2014
    #1
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  3. Aug 13, 2014 #2
    double yellow

    double yellow Road Train Member

    5,946
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    Aug 28, 2011
    State of Jefferson
    0
    Strange, my guess (and it is little more than a guess) is that you have a fuel delivery issue that is apparent at low elevations where the air is dense (needing more fuel). Do you have the correct fuel filter (I have heard of Speedco/TA type places putting in an incorrect micron filter for your engine)? Do you have old, rubber fuel lines?
     
    double yellow, Aug 13, 2014
    double yellow, Aug 13, 2014
    #2
  4. Aug 13, 2014 #3
    RSQ20

    RSQ20 Medium Load Member

    315
    93
    Jul 11, 2013
    Upper Fraser Valley, BC Canada
    0
    There is a barometric module that disables the EGR at altitude.. We had the same issue...

    ... Philip
     
    RSQ20, Aug 13, 2014
    RSQ20, Aug 13, 2014
    #3
  5. Aug 13, 2014 #4
    brknwng

    brknwng Bobtail Member

    39
    4
    Apr 21, 2014
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    Have the correct filters plus fairly new lines!
     
    brknwng, Aug 13, 2014
    brknwng, Aug 13, 2014
    #4
    double yellow Thanks this.
  7. Aug 13, 2014 #5
    brknwng

    brknwng Bobtail Member

    39
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    Apr 21, 2014
    0
    Iwas thinking along the lines that it may be the Barometric sensor [as Caterpillaar calls it] Every once in a while I'm getting a check engine light and when I push the button to check fault it's giving me a code 26 which refers to the Barometric sesor. However you can switch it off and restart then check again and get a code 55 which means no faults! It's got me puzzled! It never gave me code until after they replaced the ECM in California almost two weeks ago.
     
    brknwng, Aug 13, 2014
    brknwng, Aug 13, 2014
    #5
  8. Aug 13, 2014 #6
    GrapeApe

    GrapeApe Road Train Member

    2,215
    2,211
    Jan 7, 2013
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    You don't have an EGR valve, Detroit's are the ones that disable the EGR at high altitude. Check the connection on the barometric pressure sensor. It is right next to the oil pressure sensor by the ECM. They may have pulled on the wires chaning ECM's. Flash code 26 is a bad sensor, wiring or connection to the sensor.
     
    GrapeApe, Aug 13, 2014
    GrapeApe, Aug 13, 2014
    #6
  9. Aug 13, 2014 #7
    ShortBusKid

    ShortBusKid Heavy Load Member

    955
    1,269
    Dec 5, 2010
    Vegas
    0
    Be a real shame if that sensor went bad and your EGR was off all the time. Hint hint
     
    ShortBusKid, Aug 13, 2014
    ShortBusKid, Aug 13, 2014
    #7
  10. Aug 13, 2014 #8
    brknwng

    brknwng Bobtail Member

    39
    4
    Apr 21, 2014
    0
    It's a 3406e Cat no EGR involved!
     
    brknwng, Aug 13, 2014
    brknwng, Aug 13, 2014
    #8
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