Idle Surge every 20 seconds in '01 V70 XC

Discussion in 'Volvo V70' started by Stephen Henning, Jun 28, 2008.

  1. My '01 V70 XC has a continuing problem where the idle momentarily surges
    every 20 seconds. The surge is a couple hundred RPM. It is disconcerting
    when I am coasting to a stop or braking. The surge causes the car to
    lurch forward. It feels very unsafe. I have gone to the Volvo dealer
    about it and the mechanic says he has the latest computer updates loaded
    and has no idea where to start. It has 106,000 miles and has always
    received scheduled dealer service. This has the low pressure turbo 5
    cylinder engine.
    --
    Cheers, Steve Henning in Reading, PA, USA
    Owned '67,'68,'71,'74,'79,'81,'87,'93,'95 & '01 Volvos.
    The '67,'74,'79,'87,'95 and '01 through European Delivery.
    http://rhodyman.net/homevo.html
     
    Stephen Henning, Jun 28, 2008
    #1
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  2. Stephen Henning

    blurp Guest

    On Sat, 28 Jun 2008 09:31:18 -0400, Stephen Henning <>
    wrote:

    >My '01 V70 XC has a continuing problem where the idle momentarily surges
    >every 20 seconds. The surge is a couple hundred RPM. It is disconcerting
    >when I am coasting to a stop or braking. The surge causes the car to
    >lurch forward. It feels very unsafe. I have gone to the Volvo dealer
    >about it and the mechanic says he has the latest computer updates loaded
    >and has no idea where to start. It has 106,000 miles and has always
    >received scheduled dealer service. This has the low pressure turbo 5
    >cylinder engine.


    I found that as my AC Compressor was starting to seize its clutch
    would put a dragging load on the engine and then disengage, causing
    the engine to race a bit as it adjusted to the freed load.

    I don't know how best to test this except to listen for the compressor
    engaging/disengaging while watching the tach.

    Cheers,
    blurp
     
    blurp, Jul 2, 2008
    #2
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  3. blurp <> wrote:

    > Stephen Henning <> wrote:
    >
    > >My '01 V70 XC has a continuing problem where the idle momentarily surges
    > >every 20 seconds. The surge is a couple hundred RPM. It is disconcerting
    > >when I am coasting to a stop or braking. The surge causes the car to
    > >lurch forward. It feels very unsafe. I have gone to the Volvo dealer
    > >about it and the mechanic says he has the latest computer updates loaded
    > >and has no idea where to start. It has 106,000 miles and has always
    > >received scheduled dealer service. This has the low pressure turbo 5
    > >cylinder engine.

    >
    > I found that as my AC Compressor was starting to seize its clutch
    > would put a dragging load on the engine and then disengage, causing
    > the engine to race a bit as it adjusted to the freed load.
    >
    > I don't know how best to test this except to listen for the compressor
    > engaging/disengaging while watching the tach.


    Thanks for the info. I will see if I can coordinate the surge with the
    AC switching. Shutting off the AC does seem to prevent it. Your
    explanation lets me know why it is much more pronounced than normal.
    --
    Cheers, Steve Henning in Reading, PA, USA
    Owned '67,'68,'71,'74,'79,'81,'87,'93,'95 & '01 Volvos.
    The '67,'74,'79,'87,'95 and '01 through European Delivery.
    http://rhodyman.net/homevo.html
     
    Stephen Henning, Jul 17, 2008
    #3
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