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turbo whistling, low boost pressure code

Discussion in 'Volvo Forum' started by wildoats, Jul 6, 2011.

  1. Jul 6, 2011 #1
    wildoats

    wildoats Bobtail Member

    1
    0
    Jul 6, 2011
    sacramento, california
    0
    we have a volvo 780 with cummins isx engine. definitely got an air leak (spit valve going off approx. every minute) and the turbo has got a loud whistle on acceleration up hills, and even sometimes when sitting still. when the whistling occurs we also sometimes get a ... kind of bark or cough noise and the truck will hesitate. the code coming up is erratic boost pressure. we already had the air charge cooler replaced, as well as the air line that goes to the waste gate on the turbo. where should we look next? seems like nothign we do cures the air leak ...
     
    wildoats, Jul 6, 2011
    wildoats, Jul 6, 2011
    #1
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  3. Aug 4, 2011 #2
    Tez

    Tez Light Load Member

    64
    5
    Jun 23, 2011
    Bradford, PA
    0
    Could it be an exhaust leak? That could make it whistle loud. The bark/cough might be water in your fuel. Try some dry gas or some diesel fuel additive to remove the water.
     
    Tez, Aug 4, 2011
    Tez, Aug 4, 2011
    #2
  4. Aug 23, 2011 #3
    tommyguns

    tommyguns Bobtail Member

    1
    0
    Aug 23, 2011
    ellsworth, wi
    0
    air to air is leaking
     
    tommyguns, Aug 23, 2011
    tommyguns, Aug 23, 2011
    #3
  5. Sep 16, 2011 #4
    jgent74

    jgent74 Bobtail Member

    42
    18
    Sep 6, 2011
    Columbus,Ohio
    0
    if you are getting the "barking" are you also puffing black smoke when it does it? Could be EGR if that's the case. I drive a 09 ISX 500 13 speed, did the same thing, was also getting low boost pressure codes. EGR and EGR Cooler both needed replaced.
     
    jgent74, Sep 16, 2011
    jgent74, Sep 16, 2011
    #4
  7. Sep 19, 2011 #5
    T|2uck3r

    T|2uck3r Light Load Member

    106
    30
    Sep 27, 2010
    55 Zone
    0
    turbo whistling? heh thats familiar, but mine whistles only when Im going down the hills and slightly press on gas pedal. So this time I found a small leak in my muffler, went and bought a PP muffler and I'll see if its goes away..
     
    T|2uck3r, Sep 19, 2011
    T|2uck3r, Sep 19, 2011
    #5
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