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Whistling Sound DD15

Discussion in 'Freightliner Forum' started by Bob.g, Apr 16, 2016.

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  1. Apr 16, 2016 #1
    Bob.g

    Bob.g Light Load Member

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    I have a 2011 freightliner cascadia and when I drive I hear a whistling sound from under my engine I believe, I'm wondering if anyone knows what this could be, thank you!
     
    Bob.g, Apr 16, 2016
    Bob.g, Apr 16, 2016
    #1
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  3. Apr 16, 2016 #2
    Banker

    Banker Road Train Member

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    I have a larger turbo than stock and it whistles louder than any rig I have driven. It could be the same thing unless it just started doing something that it didn't use to do.
     
    Banker, Apr 16, 2016
    Banker, Apr 16, 2016
    #2
    Bob.g Thanks this.
  4. Apr 16, 2016 #3
    Sho Nuff

    Sho Nuff Road Train Member

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    Could be an exhaust leak from the manifold.
     
    Sho Nuff, Apr 16, 2016
    Sho Nuff, Apr 16, 2016
    #3
    Bob.g Thanks this.
  5. Apr 16, 2016 #4
    ipogsd

    ipogsd Heavy Load Member

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    On my 3rd Cascadia, they whistle while under boost.
     
    ipogsd, Apr 16, 2016
    ipogsd, Apr 16, 2016
    #4
    Bob.g Thanks this.
  7. Apr 16, 2016 #5
    daf105paccar

    daf105paccar Road Train Member

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    Has it allways done that?
    Has something changed?
     
    daf105paccar, Apr 16, 2016
    daf105paccar, Apr 16, 2016
    #5
    Bob.g Thanks this.
  8. Apr 16, 2016 #6
    Bob.g

    Bob.g Light Load Member

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    It started at the end of last year and it has been louder during recent runs, it sounds as if i were in a yard with a lot of trailers with the wind blowing making that whistling sound
     
    Bob.g, Apr 16, 2016
    Bob.g, Apr 16, 2016
    #6
    daf105paccar Thanks this.
  9. Apr 17, 2016 #7
    daf105paccar

    daf105paccar Road Train Member

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    Has your MPG changed?
     
    daf105paccar, Apr 17, 2016
    daf105paccar, Apr 17, 2016
    #7
    Bob.g Thanks this.
  10. Apr 17, 2016 #8
    RustyBolt

    RustyBolt Road Train Member

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    Bement, IL
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    Sounds like an exhaust or boost leak. Grab a spray bottle with soapy water and start spraying.

    When mine got loud, I sprayed it all down and found nothing. Until I got up on the steer tire. That's when I noticed the large hose going from my air cleaner to the turbo had came loose at the back of the filter box.
     
    RustyBolt, Apr 17, 2016
    RustyBolt, Apr 17, 2016
    #8
    Bob.g Thanks this.
  11. Apr 17, 2016 #9
    Bob.g

    Bob.g Light Load Member

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    in the last run it was better over 8 mpg, i used to get less
     
    Bob.g, Apr 17, 2016
    Bob.g, Apr 17, 2016
    #9
  12. Apr 17, 2016 #10
    Bob.g

    Bob.g Light Load Member

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    Sep 28, 2015
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    Thats a great idea, ill try it out tomorrow morning see how it goes, going to take a while i guess
     
    Bob.g, Apr 17, 2016
    Bob.g, Apr 17, 2016
    #10
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