Engine missing and skipping

Discussion in 'Peterbilt Forum' started by Pbarker, Jun 17, 2017.

  1. Jun 17, 2017 #1
    Pbarker

    Pbarker Bobtail Member

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    Jun 17, 2017
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    I have a peterbilt 379 with a 12.7 detroit
    The engine seems to idle and run fine but i can hear it missing and skipping in the exhaust ive tested the injectors changed a few feul lines that were leaking and changed both feul filters does anybody have any suggestions on why it wiuld sound like its missfiring in the exhaust but the engines sounds like its running smooth
     
    Pbarker, Jun 17, 2017
    Pbarker, Jun 17, 2017
    #1
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  3. Jun 18, 2017 #2
    ExOTR

    ExOTR Windshield Chipper Extraordinaire

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    How long since your last overhead?
     
    ExOTR, Jun 18, 2017
    ExOTR, Jun 18, 2017
    #2
  4. Jun 18, 2017 #3
    Shock Therapy

    Shock Therapy Road Train Member

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    Is it a Fitzgerald Glider?
     
    Shock Therapy, Jun 18, 2017
    Shock Therapy, Jun 18, 2017
    #3
  5. Jun 18, 2017 #4
    Bean Jr.

    Bean Jr. Road Train Member

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    Not likely. They stopped making 379s 10 years ago. Prebuilt gliders to avoid emission engines took off when the DPF started.

    Believe it or not, until Daimler-Chrysler bought Detroit, Detroit's were available from every manufacturer. I had one in my 96 379, and have one in my 94 W900.
     
    Bean Jr., Jun 18, 2017
    Bean Jr., Jun 18, 2017
    #4
    HopeOverMope and Shock Therapy Thank this.
  7. Jun 18, 2017 #5
    I glide 47

    I glide 47 Road Train Member

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    Sounds like the Detroit stumble. R. Is this something new
     
    I glide 47, Jun 18, 2017
    I glide 47, Jun 18, 2017
    #5
  8. Jun 18, 2017 #6
    shogun

    shogun Road Train Member

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    Have you checked for soot near the exhaust manifold indicating an exhaust leak which sounds like a tapping noise? Also, and I doubt this is it, but a worn cam lobe would have excessive play in the lash and make a noise too. Truck may still pull well and run fine even with the worn lobe, only way to tell is to run the overhead.
     
    shogun, Jun 18, 2017
    shogun, Jun 18, 2017
    #6
    Bean Jr. Thanks this.
  9. Jun 19, 2017 #7
    nasriza

    nasriza Road Train Member

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    check bull gear if it gets loose it will start making this kind of issues
     
    nasriza, Jun 19, 2017
    nasriza, Jun 19, 2017
    #7
    Bean Jr. Thanks this.
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