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Idle below specification (500 rpm ) 700

posted by  someone claiming to be Swedish Babe on  Thu Sep 2 19:03 CST 2004 [RELATED]

My 1989 740 has a rough idle, it is around 500/600 rpm. I just cleaned the throttle body but I haven't noticed any change. is it possible that my IAC valve is bad? or is it a bad ECT? Thanks for any reply.








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    Idle below specification (500 rpm ) 700

    posted by  someone claiming to be JimL on  Fri Sep 3 02:26 CST 2004 [RELATED]

    There should be an idle air bypass screw with a knurled knob on the throttle body. Unscrew it a couple of turns to increase the base idle speed up to where you want it.








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      Idle below specification (500 rpm ) 700

      uid 55's pic
      posted by  john sargent on  Fri Sep 3 05:18 CST 2004
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      last visit: Wed Oct 22 09:07 CST 2014
      [RELATED]

      1989 model year NA cars have LH 2.4, and no Idle Adjustment Knob. The IAC is probably tired. Some people have had success by carefully adjusting the throttle valve idle stop screw to open the throttle valve slightly and bring the hot idle RPM up to 700/750 RPM.
      --
      john








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      Idle below specification (500 rpm ) 700

      posted by  someone claiming to be j on  Fri Sep 3 04:24 CST 2004 [RELATED]

      that is not how you adjust bypass knob!

      You must ground IAC pigtail located near battery first then set to about 650 rpm,remove ground connection and computer will activate IAC to bring up to 750.

      PS: make sure A/C,defrost is not on when setting.








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        Idle below specification (500 rpm ) 700

        posted by  someone claiming to be JimL on  Fri Sep 3 04:42 CST 2004 [RELATED]

        Yes I know about grounding out the pigtail, but since her idle is just 500 rpm that indicates to me that the IAC is not working and won't make any difference anyway!








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    Idle below specification (500 rpm ) 700

    posted by  faze on  Thu Sep 2 21:05 CST 2004
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    There are several areas to look at. Assuming you've gone thru the ignition already and the injectors are clean I'd start looking for vacuum leaks.







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