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low idle on deceleration S70 1998

posted by  red98S70T5SE on  Tue Jan 15 14:00 CST 2008
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last visit: Fri Jan 18 13:31 CST 2008
[RELATED]

My engine idles down to 450 rpm when the engine temp gauge hasn't been at full temp for a few minutes while slowing to stop. Only when outside temp is around 0 and colder. I've replaced the coolant temp sensor and thermostat/coolant as well as new rotor, cap, wires and plugs.
It does it in neutral too, so, should I think it is the O2 sensors not heating up, MAF is clean,

What do you think I should do next? more likley? MAF, O2(s), or throttle position sensor?








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    low idle on deceleration S70 1998

    posted by  KlausC on  Wed Jan 16 08:37 CST 2008
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    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    Because it goes away when it gets relatively warmer, could it be that the tranny fluid is still cold and the tranny is slow to release the torque converter????? Perhaps a check on the tranny fluid and a flush?

    Klaus
    --
    The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)








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      low idle on deceleration S70 1998

      posted by  red98S70T5SE on  Thu Jan 17 01:07 CST 2008
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      last visit: Fri Jan 18 13:31 CST 2008
      [RELATED]

      Tranny fluid is nice and clean, the car still does it if I put in neutral while rolling to top. 450 rpm is too low more like 600rpm (reading my memory wrong).

      I'm not sure how I can test any of the components one at a time.
      Any suggestions for testing Idle valve, and MAF?








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    low idle on deceleration S70 1998

    posted by  KlausC on  Wed Jan 16 04:22 CST 2008
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    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    KSG said it corrrectly, your idle control valve is probably full of dirt. At 0F it is cold enough to cause a dirty valve to stick. Cleaning the throttle body is always a good thing to do. If you take off the TB, make sure you have a new gasket (OEM).

    Klaus
    --
    The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)








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    low idle on deceleration S70 1998

    posted by  someone claiming to be ksg on  Wed Jan 16 02:10 CST 2008 [RELATED]

    Are the throttle body and idle air control motor (or drive-by-wire equivalent if that is what you have on your car) scrupulously clean?







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