Loud howling noise has Cummins Techs stumped.

Discussion in 'Volvo Forum' started by Bob9814992, Sep 15, 2016.

  1. Bob9814992

    Bob9814992 Bobtail Member

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    Feb 18, 2012
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    A few months ago my 2014 Volvo 780 with Cummins ISX 15 started having an intermittent howling noise. I mostly noticed it when I parked for the night after I revved up the idle. While checking for loose hoses, I found that the expansion tank (plastic tank on top of radiator) was leaking. It was cracked internally and had to be replaced. Now the noise is worse. It will sit at regular idle and run perfect but if you accelerate the howling sound starts. It is an even sound, no matter how high you rev the motor it will stay at the same pitch. It sounds like an air leak and loud enough that you can hear it a quarter of a mile away. It seems to be coming from the drivers side, back where the fire wall curves back into toward the cab. It has been in the Cummins shop with multiple techs and regional reps working on it with no results for three days. Ran motor without belts. Replaced the oil pump. Checked hoses and air lines for leaks. Any suggestions?????
     
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  3. gokiddogo

    gokiddogo Road Train Member

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  4. ShooterK2

    ShooterK2 Road Train Member

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  5. Grumppy

    Grumppy Trucker Forum STAFF Staff Member

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    With "mostly" being the key work here, are you saying it does OR does NOT do this when driving? Or, are you saying it ONLY does it when sitting still, just above an idle? Can you elaborate on this a little more?
     
  6. baha

    baha Road Train Member

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    Some other ones have a very small leak in the flex part of air line off air compressor, when eng. air comp. is off no leak, with eng. fan off listen to it with long a pvc. pipe to your ear till you find it?
     
    Last edited: Sep 15, 2016
  7. CoyoteExpress

    CoyoteExpress Medium Load Member

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    The junkins oh cummins in my last ibe cost me 30k in 12 month .... never again
     
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  8. Bob9814992

    Bob9814992 Bobtail Member

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    Yes it does this while driving and while sitting still if you press on the accelerator. The only time it doesn't is if it is at regular idle.
     
  9. nasriza

    nasriza Road Train Member

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    probably some kind of leak either from exhaust manifold gasket or maybe an egr or boost pipe
     
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  10. Snailexpress

    Snailexpress Road Train Member

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    Get exhaust gases in coolant test kit from NAPA and be ready for big $$$$$ to replace engine.
    And find good mechanic.
     
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  11. Snailexpress

    Snailexpress Road Train Member

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    ECM is commanding turbo to play to keep emission . Most likely expansion reservoir got cracked by exhaust gases. cummins has problem with the liners fretting and head gasket.
     
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