Isx cm871 holset turbo hissing and whistling when letting of the throttle.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Hush, Apr 22, 2014.

  1. Hush

    Hush Bobtail Member

    18
    7
    Oct 27, 2013
    0
    Just as the title says, when I let of the throttle, it hisses and whistles. Mind you, it is not loud, but it is beginning to drive me crazy!

    It is a 2008 Volvo, if that has anything to do with it.

    The boost gauge shows about 2-3 psi while it is doing it.

    It has been doing it since I got this truck 2 years ago. It is still doing it even when I replaced the turbo with problems unrelated to this.

    Is this normal? Or is it a design flaw?

    Truck pulls well, good fuel economy. In fact, the turbo is quieter when pulling. So much so that I can barely hear it!

    I made a video that you can listen to. Thanks in advance.
    http://youtu.be/RgpG1DlqTew
     
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  3. Edgar2191

    Edgar2191 Light Load Member

    178
    32
    Apr 9, 2013
    0
    Does it do during the regen cause mine did I think its normal
     
  4. Hush

    Hush Bobtail Member

    18
    7
    Oct 27, 2013
    0
    Yes, it does it all the time when I let go of the throttle. It never used to bother me, but now it is driving me crazy! Lol
     
  5. tinys trucking

    tinys trucking Bobtail Member

    35
    7
    Feb 20, 2014
    0
    I wonder if the variable valve is acting up? just a thought.
     
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