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Overhauled, less power

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Stugots1, Apr 1, 2021.

  1. Apr 1, 2021 #1
    Stugots1

    Stugots1 Guest

    Hello, got my truck back from an overhaul today. Drove it around the town and it was fine. Had about a 25 min highway drive home. Truck totally floored and I could not exceed 65mph. On inclines, it would slow down to 55 or so. Nothing I could do, even on flat ground would get me above 65. It’s not sputtering or missing. Boost seems good. This wasn’t an issue before the overhaul. I never had the truck floored and I’ve run it well into 80.
    Truck has a Cat c15 in it.
    I don’t know what to make of this.
     
    Stugots1, Apr 1, 2021
    Stugots1, Apr 1, 2021
    #1
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  3. Apr 2, 2021 #2
    lester

    lester Midwest's #1 Feed Hauler

    2,941
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    Jan 2, 2012
    NW, Iowa
    0
    Do you have boost gauge or fuel pressure gauge? Bobtail? Take it back
     
    lester, Apr 2, 2021
    lester, Apr 2, 2021
    #2
  4. Apr 2, 2021 #3
    Gix1k

    Gix1k Medium Load Member

    373
    586
    Dec 11, 2019
    0
    I had this issue at one time.
     
    Gix1k, Apr 2, 2021
    Gix1k, Apr 2, 2021
    #3
  5. Apr 2, 2021 #4
    062

    062 Road Train Member

    6,299
    33,852
    Oct 20, 2013
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    Who did the work? If it was cat or a dealership they may have reflashed the ecm.
     
    062, Apr 2, 2021
    062, Apr 2, 2021
    #4
    91B20H8 Thanks this.
  7. Apr 2, 2021 #5
    Lazer

    Lazer Road Train Member

    1,837
    2,965
    Jan 22, 2017
    0
    The settings on the computer were probably changed, take it back to the shop. Tell them what you want the limits too be, ie; max mph, idle time, cruise settings, etc. They should have asked you.
     
    Lazer, Apr 2, 2021
    Lazer, Apr 2, 2021
    #5
  8. Apr 2, 2021 #6
    AModelCat

    AModelCat Road Train Member

    29,498
    162,516
    Jul 7, 2015
    Canuckistan
    0
    Good ol' low NOx file.
     
    AModelCat, Apr 2, 2021
    AModelCat, Apr 2, 2021
    #6
    little cat 500, baha and Brettj3876 Thank this.
  9. Apr 2, 2021 #7
    stillwurkin

    stillwurkin Road Train Member

    1,756
    2,856
    Dec 2, 2017
    0
    Did shop set overhead correctly? Thats if the shop didn't mess with the ecm like mentioned. Had a mechanical cummins that i had a headgasket replaced. Got it back and it ran like a sick dog. Got the engine overhead readjusted ( valves and injectors) problem solved. I say take it back to the shop or someone better.
     
    stillwurkin, Apr 2, 2021
    stillwurkin, Apr 2, 2021
    #7
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