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N14 celect plus stutter in high gears

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Ironhauler, Dec 23, 2012.

  1. Dec 23, 2012 #1
    Ironhauler

    Ironhauler Bobtail Member

    18
    2
    Dec 23, 2012
    Bass Lake, Indiana
    0
    Please help ive replaced everything from the ecm to the injectors and still have a stutter in the higher gears but a very little loss in power and still.getting 6.9mpg average with 85000/90000 on the ground please help
     
    Ironhauler, Dec 23, 2012
    Ironhauler, Dec 23, 2012
    #1
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  3. Dec 24, 2012 #2
    freightrunner

    freightrunner Heavy Load Member

    722
    182
    Mar 25, 2012
    Georgia
    0
    I had the same same problem in 8th right after I had the ecm replaced. I had to get it re programed to fit the truck.
     
    freightrunner, Dec 24, 2012
    freightrunner, Dec 24, 2012
    #2
    Ironhauler Thanks this.
  4. Dec 25, 2012 #3
    Ironhauler

    Ironhauler Bobtail Member

    18
    2
    Dec 23, 2012
    Bass Lake, Indiana
    0
    Is that the sensor on the tail of the tranny with 4 wires coming out of it? If so two of them have been spliced w/butt connectors but the other two look factory. The splicing was not done by me. My motto is do it right or get off the creeper.
     
    Ironhauler, Dec 25, 2012
    Ironhauler, Dec 25, 2012
    #3
  5. Dec 25, 2012 #4
    Davidlee

    Davidlee Medium Load Member

    419
    156
    Aug 31, 2012
    0
    I wolud guess that you have a fuel related problem somewhere between the fuel filter and the fuel tank stand pipe. A fuel filter head, fuel line fitting or oring, ECM cooling plate or fuel tank crossover valve if you have one. Keep in mind the engine has to work harder in the higher gears and for that reason the problem may not be as noticable in the lower gears. Another possibility is that the ECM could be seeing an out of range engine speed signal and is reacting accordingly, this is common where someone would advance the timing or install the wrong injectors in an engine.
     
    Davidlee, Dec 25, 2012
    Davidlee, Dec 25, 2012
    #4
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