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Idle Woes 850 1995

posted by  someone claiming to be VolvoIRL on  Tue Jan 3 22:45 CST 2006 [RELATED]

On cold starts my 850 idles at about 600rpm and lopes a little down to 500 and back to 600. Once the car has fully warmed up it idles high at 1100 - 1200 rpm . Any ideas?








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    Idle Woes 850 1995

    posted by  BOJO on  Wed Jan 4 21:51 CST 2006
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    Check the idle control valve, it is a little electrical motor
    that opens and closes a little air channel inside the valve.
    It controls the idle rpm when the throttle is closed. It gets its signals from the engine control unit. I cleaned mine on my 96 850 and it solved the problem for me.








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    Idle Woes 850 1995

    posted by  someone claiming to be ksg on  Wed Jan 4 04:55 CST 2006 [RELATED]

    I would look for dirty throttle body and/or stuck throttle plate or linkage, and/or dirty idle air motor. If stuck open these parts would let in too much air - possibly causing overlean mixture and idle speed hunting when could and too fast idle when warm. I assume you don't show a trouble code?








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      Idle Woes 850 1995

      posted by  someone claiming to be VolvoIRL on  Wed Jan 4 05:31 CST 2006 [RELATED]

      Will check them out - No codes are showing








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    Idle Woes 850 1995

    posted by  someone claiming to be fixit 2003 on  Wed Jan 4 01:47 CST 2006 [RELATED]

    Maybe try replaceing the engine temp sensor. I understand it's pretty easy. Located under the engine top radiator hose.








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      Idle Woes 850 1995

      posted by  MadeInJapan on  Wed Jan 4 02:00 CST 2006
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      last visit: Sat Oct 2 06:34 CST 2010
      [RELATED]

      what does the temp sensor show on the dash when the car is warmed up...would agree here if the temp is under the 3:00 mark when warmed up...in that case, I would also change the thermostat.
      --
      1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.








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        Idle Woes 850 1995

        posted by  someone claiming to be VolvoIRL on  Wed Jan 4 04:01 CST 2006 [RELATED]

        Both the thermostat and temp sensor have been recently replaced.

        The temp guage shows 3:00, so I presume its ok

        I do have a slight radiator leak though







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