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Odd noise from behind dash when letting off throttle. Driving me crazy!

Discussion in 'Freightliner Forum' started by Tristar, Nov 17, 2013.

  1. Nov 17, 2013 #1
    Tristar

    Tristar Bobtail Member

    2
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    Nov 17, 2013
    0
    05 Freightliner M2.

    Started off very faint but now its loud and very distinct. I cant say that its 100% coming from behind the instrument cluster but its between there and the gas pedal. Almost sounds like a tea pot when its boiling. Usually starts around 45 to 55 mph and when the truck is up to temp. It will only make this noise if its under load. I don't think its a air leak and I know its not bleed through coming from the speakers.



    Thanks for any help

    RM
     
    Tristar, Nov 17, 2013
    Tristar, Nov 17, 2013
    #1
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  3. Nov 17, 2013 #2
    baha

    baha Road Train Member

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    Jul 25, 2013
    ga
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    does it have ex. brake on that eng.
     
    baha, Nov 17, 2013
    baha, Nov 17, 2013
    #2
  4. Nov 17, 2013 #3
    Tristar

    Tristar Bobtail Member

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    Nov 17, 2013
    0
    Should have mentioned , it has a Mercedes.

    No exhaust brake.


    I just had the egr cooler replaced but the noise started a few days prior to having any work done. Ive looked at all the clamps, and piping and everything seems tight and I cant find any areas that look to be leaking.
     
    Tristar, Nov 17, 2013
    Tristar, Nov 17, 2013
    #3
  5. Nov 17, 2013 #4
    VegasBiker

    VegasBiker Light Load Member

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    Nov 4, 2013
    Vegas Baby!
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    Does it have a boost gage? If so you may have a leak at the spaghetti line connection, most of the lines come thru the firewall right behind the column. Tight spot and kind a PITA to work on...
     
    VegasBiker, Nov 17, 2013
    VegasBiker, Nov 17, 2013
    #4
  7. Nov 17, 2013 #5
    VegasBiker

    VegasBiker Light Load Member

    89
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    Nov 4, 2013
    Vegas Baby!
    0
    It would only do this under load when making boost, when you let off it creates vacuum and sucks itself closed.
     
    VegasBiker, Nov 17, 2013
    VegasBiker, Nov 17, 2013
    #5
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