2001 Volvo S60 2.0T - 90k Miles

Discussion in 'Volvo S60' started by mcbrien410, Aug 9, 2009.

  1. mcbrien410

    mcbrien410 Guest

    My S60 is surging/hunting at idle between 700rpm and 1000rpm. It is
    more pronounced when the a/c is switched on. I'm thinking Mass Flow
    sensor.

    I changed the plugs today with no change in performance.

    I have an OBDII reader. There are no faults appearing on the message
    display on the dashboard.

    The car runs just fine, I can pull 6000rpm through the gears no
    problem.

    Any suggestions?

    Regards Chris.
     
    mcbrien410, Aug 9, 2009
    #1
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  2. mcbrien410

    James Sweet Guest


    I would start by cleaning the throttle body and if it has one, idle air
    valve. This stuff tends to get gummed up from oil vapors out of the
    crankcase vent system, mileage is about right for that.

    Air mass meter normally causes much more pronounced problems when it
    acts up.
     
    James Sweet, Aug 9, 2009
    #2
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  3. mcbrien410

    Tim.. Guest

    No, more likely to be the ETM, very very very very common on the early
    Marelli units. There is a dealer software update and clean which helps, but
    the unit is on its last legs and will need changing to the much more
    reliable Bosch ones. This again requires new software in the ecu.

    If the idle isnt too bad with the a/c off, but worse with it on, then
    definately the etm.

    Google Volvo ETM.

    Tim.
     
    Tim.., Aug 11, 2009
    #3
  4. mcbrien410

    GlennK Guest

    It sounds like the ETM is acting up return to your local Volvo dealer &
    have them perform Recall # 155 ETM Software Upgrade if this was already
    performed the ETM may be very dirty which is caused by the breather box
    being clogged partially or totally the dealer will be able to correctly
    diagnose this for you as for no codes the obd reader will not read the
    ETM for some reason if the ETM is faulty it is under the 10 Year 200K
    Extended Warranty but the ETM cleaning is not part of the extended
    warranty & is the breather box if it is determined that these are the
    problems almost always it is an internal fault in the throttle unit but
    Volvo requires that the ETM be cleaned first before replacement
    G Klein
    Volvo Certified Technician 2008
    ASE Certified Technician 2008
     
    GlennK, Aug 11, 2009
    #4
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