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Injector noise N14

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 20advance, Feb 8, 2009.

  1. Feb 8, 2009 #1
    20advance

    20advance Bobtail Member

    3
    0
    Feb 8, 2009
    Arcanum,Oh
    0
    I am new to the site and am having trouble finding a odd noise on a N14.
    I had a injector changed 2 weeks ago and it did not help.
    Here's my problem
    The engine makes a loud bang or pop out the exhuast very erratic and I can't get it to do it when I want. I have Cummins INSITE 6.2 PRO and hooked it to it and run cyl. cutout test. Found on friday night in motel parking lot that when you click START button for cyl. cutout test noise totally disappears, as soon as you click STOP cyl. cutout test button noise returns. To me it almost sounds like over-fuel on one injector. The cyl. cutout test shows all injectors operating fine, at idle and on the road.

    sorry for being so long winded

    I am a farmer and don't drive it to much but when drove I am the driver.

    Thanks
    20advance
     
    20advance, Feb 8, 2009
    20advance, Feb 8, 2009
    #1
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  3. Feb 8, 2009 #2
    Bigstretch

    Bigstretch Light Load Member

    161
    30
    Jun 14, 2008
    NW IL
    0
    Sounds like an electrical problem, not mechanical...............
     
    Bigstretch, Feb 8, 2009
    Bigstretch, Feb 8, 2009
    #2
  4. Feb 9, 2009 #3
    vegetto05

    vegetto05 Light Load Member

    95
    23
    Jan 5, 2009
    KC, MO
    0
    Yeah, thats one problem I think everyone has experienced on a N-14 or M-11. First thing to check is the ground fuse for the ECM, its located a the rear of the ECM, on top of all the connectors.

    Remember when doing the cutout is to make sure the percent fuel isn't changing. If its running over ...................about 4-5% at idle we have a problem. Usually when you run the cutout on a cylinder the percent fuel should jump to about 10-11. And obviously if you're already at 10-11, just watch it and when it doesn't change you've found your cylinder.

    If its not a fueling noise, which I think it is.....you may want to take off the valve covers and inspect the springs and push tubes......oh that reminds me...do you have engine brakes?

    Normally this problem is caused by an injector and is easier to diagnose with the engine brakes off.....but just remember to plug the oil rifle.
     
    vegetto05, Feb 9, 2009
    vegetto05, Feb 9, 2009
    #3
  5. Feb 9, 2009 #4
    20advance

    20advance Bobtail Member

    3
    0
    Feb 8, 2009
    Arcanum,Oh
    0
    Thanks for the replies
    I'm all ears to all ideas

    Also I do have Jakes

    And the cummins dealer set the whole overhead 2 weeks ago, made no difference.

    20advance
     
    20advance, Feb 9, 2009
    20advance, Feb 9, 2009
    #4
  7. Feb 9, 2009 #5
    20advance

    20advance Bobtail Member

    3
    0
    Feb 8, 2009
    Arcanum,Oh
    0
    vegetto05,
    Having trouble finding ECM ground fuse?
    What does it look like and do all N14 have it?
    Looked for 20 min. tonight and cannot seem to find it.

    Thanks for your help
    20advance
     
    20advance, Feb 9, 2009
    20advance, Feb 9, 2009
    #5
  8. Feb 10, 2009 #6
    vegetto05

    vegetto05 Light Load Member

    95
    23
    Jan 5, 2009
    KC, MO
    0
    No, I think just the E+......or maybe all the celect plus...

    If its not there, I wouldn't worry about it. If it was...it grounds to the top rear bolt of the ECM cooler...
     
    vegetto05, Feb 10, 2009
    vegetto05, Feb 10, 2009
    #6
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