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Growl moaning sound

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by ebill45, Sep 19, 2018.

Page 1 of 2
  1. Sep 19, 2018 #1
    ebill45

    ebill45 Light Load Member

    167
    105
    Oct 11, 2011
    dalton ga
    0
    i have a Detroit 14l egr. I have a moaning sound or deep growl coming through the exhaust when I let off the accelator at low rpm. Checked air to air for leaks. Sprayed everything down with soapy water. No leaks. No oil leaks in the turbo It’s clean inside. Shaft no play on the intake side. No boost gauge. Got straight pipe so can really hear it at low rpm. Any help appreciated
     
    ebill45, Sep 19, 2018
    ebill45, Sep 19, 2018
    #1
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  3. Sep 19, 2018 #2
    nikmirbre

    nikmirbre Road Train Member

    5,057
    8,715
    Jul 27, 2011
    High Point NC
    0

    You check your exhaust? All the pipes. I had same issue and it was an exhaust clamp had rusted through..
     
    nikmirbre, Sep 19, 2018
    nikmirbre, Sep 19, 2018
    #2
  4. Sep 19, 2018 #3
    ebill45

    ebill45 Light Load Member

    167
    105
    Oct 11, 2011
    dalton ga
    0
    New exhaust on it
     
    ebill45, Sep 19, 2018
    ebill45, Sep 19, 2018
    #3
  5. Sep 19, 2018 #4
    nikmirbre

    nikmirbre Road Train Member

    5,057
    8,715
    Jul 27, 2011
    High Point NC
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    Are you saying you didn’t check it cause it’s new?
     
    nikmirbre, Sep 19, 2018
    nikmirbre, Sep 19, 2018
    #4
  7. Sep 19, 2018 #5
    nikmirbre

    nikmirbre Road Train Member

    5,057
    8,715
    Jul 27, 2011
    High Point NC
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    The S pipe coming out of the back of the turbo
     
    nikmirbre, Sep 19, 2018
    nikmirbre, Sep 19, 2018
    #5
  8. Sep 19, 2018 #6
    nikmirbre

    nikmirbre Road Train Member

    5,057
    8,715
    Jul 27, 2011
    High Point NC
    0
    For some reason mine was worse at low rpms and when accelerating
     
    nikmirbre, Sep 19, 2018
    nikmirbre, Sep 19, 2018
    #6
  9. Sep 19, 2018 #7
    ebill45

    ebill45 Light Load Member

    167
    105
    Oct 11, 2011
    dalton ga
    0
    I’ll check it but it looks clean. Usually get soot stains with an exhaust leak
     
    ebill45, Sep 19, 2018
    ebill45, Sep 19, 2018
    #7
  10. Sep 19, 2018 #8
    ebill45

    ebill45 Light Load Member

    167
    105
    Oct 11, 2011
    dalton ga
    0
    I’m saying I don’t see any soot stains on the exhaust from turbo out the pipe. With an egr motor there going be a lot soot
     
    ebill45, Sep 19, 2018
    ebill45, Sep 19, 2018
    #8
  11. Sep 19, 2018 #9
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    Put a muffler on it.........Dont you know that straight pipes are loud?


    Seriously though. Do you have a good flex pipe on at the engine? Is the exhaust rigid mounted anywhere that it should be isolated? Look carefully for anywhere the exhaust or engine may be hard contacting the frame or the cab and transmitting noises........ engine mounts, trans mounts ect.......
    Adding isolators to the exhaust may help deaden the noise. These are all areas I would be digging for the type of noise you are describing.
     
    Goodysnap, Sep 19, 2018
    Goodysnap, Sep 19, 2018
    #9
    Oxbow and fargonaz Thank this.
  12. Sep 19, 2018 #10
    ebill45

    ebill45 Light Load Member

    167
    105
    Oct 11, 2011
    dalton ga
    0
    Yea but they sound good It was doing it before I took the muffler off. Every thing else is oem parts as far as flex pipe locations. It’s definetly coming from the turbo going through the exhaust. I’m thinking actuator sticking or wastegate. I don’t have any codes so I’d think if it was the actuator or wastegate I be getting high exhaust pressure or high exhaust temp code
     
    Last edited: Sep 19, 2018
    ebill45, Sep 19, 2018
    ebill45, Sep 19, 2018
    #10
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