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Rough idle, sometimes fatal S70 1999

posted by  posixPilot on  Wed Oct 8 12:44 CST 2003
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Hi all,

I have a '99 S70 which has a peculiar problem with idling. Under any road condition, the engine frequently idles roughly after I take my foot off of the accelerator. I have a manaual transmission, and, invariably, the clutch is on the floor. Approximately 3 - 4 times a week, the engine will actually die.

Ususally, this just gives the guys at the office fodder for hurling insults about my car :), but recently it nearly put me into the ditch as the power steering snapped my wheel straight and the road continued to curve!

I assumed that a belt device (A/C, power steering, power brakes) might be causing the intermittent rough idle, but I cannot find a correlation. The rough idle condition has been apparent for a few years, but has only recently caused the engine to stall.

Has anyone seen this before? Any ideas how I might diagnose the problem?

Thanks!
Mike








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    Rough idle, sometimes fatal S70 1999

    posted by  rpscdn on  Thu Oct 9 13:07 CST 2003
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    Hello Mike,
    I have had problems with a mass air flow controller failing (at 48K and again at 62K) causing idle issues, and near-stall when I take foot off accelerator. Worse in park than in idle (I have automatic). Much worse in hot weather....almost fine in cold weather.

    Check the OBDII codes (check posts especially from vos) and/or disconnect MAF and see whether it gets any worse. If it does not....you probably have your culprit.

    FYI....I had a dealer tell me that my PVC system was plugged and my throttle assembly was dirty ($450+). Replacing the MAF solved my problem.

    See other posts re: MAFs.
    Good luck,
    rpscdn








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    Rough idle, sometimes fatal S70 1999

    posted by  someone claiming to be ermik on  Wed Oct 8 19:30 CST 2003 [RELATED]

    the electronic trottle module on the ´99 is known to have issues..

    maybe thats your gremlin?

    could also be a bad maf sensor

    // ermik







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