Idle noise - 98 V70 AWD

Discussion in 'Volvo V70' started by tom_sawyer70, Nov 14, 2007.

  1. tom_sawyer70

    tom_sawyer70 Guest

    My wife's 98 V70 AWD has recently (last 3-4 months it has become
    progressively louder) developed a noise at idle, which stops when the
    car is being driven. Initially, this was just while the car was in
    "park" and would subside when put in gear. However, over time, it has
    become louder and in addition to disappearing when driven, it changed
    pitch while shifting from park into gear.

    What might be the cause?
    Is this something that can be easily fixed at home?

    Thank you,
    Dave
     
    tom_sawyer70, Nov 14, 2007
    #1
  2. tom_sawyer70

    Nick Guest

    Adjust idle speed away from something at resonance ?

    Nick
     
    Nick, Nov 14, 2007
    #2
  3. tom_sawyer70

    Joerg Lorenz Guest

    Aha!? And how do you want to do just that in real life? With a
    computerised ignition and engine control?

    Let us know!
    Joerg
     
    Joerg Lorenz, Nov 14, 2007
    #3
  4. tom_sawyer70

    Baz Guest

    --

    Hi Dave,

    I think yours is the 5 cylinder engine, similar to my '96 850. I've had the
    rubber bend on the vacuum line attached to the alternator end of the inlet
    manifold deteriorate (twice) and produce a very loud "trumpet-like" sound as
    air is sucked in through a hole. It of course varies with engine load.
    It's very hard to see and even harder to replace. Have a poke at it with a
    long stick or something while the noise is happening and see if it changes.
    It's just below the thermostat housing, and connects to a hard nylon tube
    that is part of the crankcase ventilation system.

    regards
    Barry
     
    Baz, Nov 15, 2007
    #4
  5. tom_sawyer70

    Nick Guest

    Perhaps with the OBD programmer ?

    Nick
     
    Nick, Nov 16, 2007
    #5
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