Hiss near firewall and turbo vibration

Discussion in 'VW Mk4 Jetta, Golf, New Beetle, Passat TDI forum' started by HootieBird, Jan 11, 2017.

  1. HootieBird

    HootieBird New Member

    Joined:
    Aug 18, 2014
    Messages:
    7
    Car:
    VW Golf TDI 2005
    Location:
    Whitesburg, Ky
    There is a hiss while idling with exhaust escaping towards firewall side of engine as well as what sounds like the turbo rattling near 2300 rpm. I assume these issues are related but not sure. Thanks for any helpful feedback.
     
  2. John Mack

    John Mack New Member

    Joined:
    Nov 3, 2015
    Messages:
    23
    Car:
    2005.5 JETTA TDI /2015 JETTA TDI
    Location:
    OREGON
    If you have a 2005.5 or 2006 Mk5, the hiss at idle could be the exhaust gas cooler. A shaft seal goes out on an internal flapper and the leak gives a hissing noise at idle. You may also note a slight odor of diesel. There are ways to repair the shaft seal without removing the cooler or spending $300.

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  3. Erich

    Erich New Member

    Joined:
    Jun 28, 2015
    Messages:
    19
    Car:
    Vw Jetta tdi 2000
    Location:
    burlington
    Hiss at idle makes me think vacuum leak. Check all hoses and turbo actuator which is controlled by vacuum. It actuator may have rusted out and the pieces might rattle around at certain rpms.


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  4. crsmp5

    crsmp5 Well-Known Member

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    Car:
    85 kubvan
    AND they crack egr pipes also
     
  5. HootieBird

    HootieBird New Member

    Joined:
    Aug 18, 2014
    Messages:
    7
    Car:
    VW Golf TDI 2005
    Location:
    Whitesburg, Ky
    Sorry I forgot to post that it's an 05 pd golf.
     
  6. crsmp5

    crsmp5 Well-Known Member

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    Car:
    85 kubvan
    . so egr cooler or cracked egr pipe.. both hiss and blow soot/exhaust at firewall
     
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  7. John Mack

    John Mack New Member

    Joined:
    Nov 3, 2015
    Messages:
    23
    Car:
    2005.5 JETTA TDI /2015 JETTA TDI
    Location:
    OREGON
    A vacuum leak will not blow soot on the firewall, an exhaust cooler leak will. Check where the shaft for the butterfly comes out of the cooler. There is a lever arm attached to the shaft that attaches to a vacuum actuator via a small link shaft. The seal is the most common cause of a leak from the cooler. The leak is fixed from under the car. Remove the big splash panel and look around the bottom rear part of the engine. The exhaust gas cooler is cylindrical and mounted horizontally to the engine block. Removal of the passenger side drive axle will give good access to the shaft and cooler.

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  8. HootieBird

    HootieBird New Member

    Joined:
    Aug 18, 2014
    Messages:
    7
    Car:
    VW Golf TDI 2005
    Location:
    Whitesburg, Ky
    To be clear I'm not sure soot is being released. I just know exhaust is.
     

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