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ISX Cummins MPG

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by kachup, Dec 10, 2018.

  1. Dec 10, 2018 #1
    kachup

    kachup Medium Load Member

    312
    305
    Oct 23, 2013
    0
    I’m getting bad MPG. I just replaced all 6 injectors and rebuild my turbo . But the truck before was doing between 6.3-6.5 doing 70 MPH. Now my MPG went down to 5.1-5.4 MPG. The truck is tuned specs are 550 HP 13 speed with 3.55 rear. Can it be the cold weather or winter fuel?
     
    kachup, Dec 10, 2018
    kachup, Dec 10, 2018
    #1
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  3. Dec 10, 2018 #2
    Bakerman

    Bakerman Road Train Member

    4,663
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    Jan 27, 2013
    Phoenix, AZ
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    Did they set the overhead after they did the injectors?
     
    Bakerman, Dec 10, 2018
    Bakerman, Dec 10, 2018
    #2
  4. Dec 10, 2018 #3
    Rounded_nut

    Rounded_nut Light Load Member

    92
    107
    Feb 25, 2018
    0
    Winter fuel hurts but not that bad, I'm more interested in the tune though, still got the vg turbo? Watching the boost to see if it's boosting more?
     
    Rounded_nut, Dec 10, 2018
    Rounded_nut, Dec 10, 2018
    #3
  5. Dec 12, 2018 #4
    kachup

    kachup Medium Load Member

    312
    305
    Oct 23, 2013
    0
    Called my mechanic and he saying he believes is the CAC might have a small leak.. will check out when I get back home. The truck is pulling very good and zero smoke or nothing weird, just mpg just suck right now.
     
    kachup, Dec 12, 2018
    kachup, Dec 12, 2018
    #4
  7. Dec 22, 2018 #5
    Nothereoften

    Nothereoften Light Load Member

    261
    265
    Oct 6, 2018
    0
    Windy out? Winter fuel is some difference
     
    Nothereoften, Dec 22, 2018
    Nothereoften, Dec 22, 2018
    #5
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