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2 weak cylinders?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Chevyho, Sep 22, 2016.

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  1. Sep 22, 2016 #1
    Chevyho

    Chevyho Medium Load Member

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    Dec 13, 2013
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    Ive had intermittent low power/ vibration issues for some time. I have been doing a cut out test roughly once a month with all cylinders coming back as ok. Today after a day of hauling I did a test and cylinder 1 and 5 came back as questionable. Likely injectors? Ive attached a pic of test results.
     

    Attached Files:

    Chevyho, Sep 22, 2016
    Chevyho, Sep 22, 2016
    #1
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  3. Sep 22, 2016 #2
    MACK E-6

    MACK E-6 Moderator Staff Member

    46,103
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    Sep 19, 2005
    Baltimore, MD
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    Has anyone else been able to drive your truck, such as a mechanic, giving you a bystander's ear to the exhaust note so to speak?

    You'll certainly hear a lame cylinder. I listen for it with our trucks.
     
    MACK E-6, Sep 22, 2016
    MACK E-6, Sep 22, 2016
    #2
  4. Sep 23, 2016 #3
    Chevyho

    Chevyho Medium Load Member

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    Dec 13, 2013
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    Yes it is in a shop right now. They road tested it and couldnt find any issues. Also the cylinders are all coming back "ok" with values very similar to my test. So i dont know guess ill just keep running it sick of this vibrating/ sluggish truck.
     
    Chevyho, Sep 23, 2016
    Chevyho, Sep 23, 2016
    #3
  5. Sep 23, 2016 #4
    WrenchWrenchWrench

    WrenchWrenchWrench Light Load Member

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    Jan 3, 2016
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    What year and engine is it?
     
    WrenchWrenchWrench, Sep 23, 2016
    WrenchWrenchWrench, Sep 23, 2016
    #4
  7. Sep 23, 2016 #5
    Chevyho

    Chevyho Medium Load Member

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    Sorry I should have mentioned 07 pete 379 c15 acert serial nxs.
     
    Chevyho, Sep 23, 2016
    Chevyho, Sep 23, 2016
    #5
  8. Sep 24, 2016 #6
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Jan 20, 2010
    Hesperia, Ca.
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    I have had to weak injectors and just change the trim numbers. It work somewhat. They will days that the motor will purr so smooth that I think I'm in a different truck, then there are days it runs a little rough and I'm dumping cleaners in the tank, but nothing changes. One thingI have noticed is once my tanks reach 1/4 tank, its when I noticed it will run slightly rougher, once I fill up, it's putting. Go figure......
     
    Diesel Dave, Sep 24, 2016
    Diesel Dave, Sep 24, 2016
    #6
    beltrans Thanks this.
  9. Sep 24, 2016 #7
    cdub304

    cdub304 Light Load Member

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    Dec 7, 2009
    Rockford,IL
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    What does your fuel lines look like? Have you ever replaced them? How bout the engine wire harness?
     
    cdub304, Sep 24, 2016
    cdub304, Sep 24, 2016
    #7
  10. Sep 24, 2016 #8
    WrenchWrenchWrench

    WrenchWrenchWrench Light Load Member

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    Jan 3, 2016
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    Check to make sure your trim codes are correct, it sounds like those injectors are not contributing as much as the others but only intermittently. If all your trim codes are correct, you could pull those two injectors and put them in different holes and edit your trim codes accordingly. See if the problem follows. But you would have to get 4 sets of injector O-rings....
     
    WrenchWrenchWrench, Sep 24, 2016
    WrenchWrenchWrench, Sep 24, 2016
    #8
    Diesel Dave Thanks this.
  11. Sep 24, 2016 #9
    Chevyho

    Chevyho Medium Load Member

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    Dec 13, 2013
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    Fuel line is probably original to truck, external and internal wire harnesses we changed 6 months ago. Diesel dave my symptoms are exactly what you describe. Even seems to run better after fuelling up. Do you run one or 2 fuel tanks? Ive been considering that maybe it has something to do with hot fuel causing my issue.
     
    Chevyho, Sep 24, 2016
    Chevyho, Sep 24, 2016
    #9
  12. Sep 24, 2016 #10
    Chevyho

    Chevyho Medium Load Member

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    Dec 13, 2013
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    I will check trim codes today
     
    Chevyho, Sep 24, 2016
    Chevyho, Sep 24, 2016
    #10
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