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rough idle on '90 740 gl 700 1990

posted by  someone claiming to be dan on  Tue Dec 31 05:59 CST 2002 [RELATED]

i have a '90 740 gl wagon with 172k, and about 500 miles ago it began to idle roughly. It seems as if it is going to die, and then it givies itself too much throttle, bringing the idle rpm birifely upto about 1200rpm, versus the "normal" ~750rpm, then back down to 750rpm. It then continues to fluctuate like this until throttle is applied. i have checked all of the vacuum leaks, cleaned the distributor, and replaced the intake manifold gasket already. any suggestions?
thanks
dan








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    rough idle on '90 740 gl 700 1990

    posted by  Matt L on  Tue Dec 31 12:20 CST 2002
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    last visit: Mon Aug 23 08:46 CST 2010
    [RELATED]

    Have you checked for trouble codes? Like Steve said it really sounds like a classic case of dirty idle control motor and/or throttle body.

    --
    Matt L. -- Cary, NC -- '91 740 wagon








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    rough idle on '90 740 gl 700 1990

    posted by  Steve on  Tue Dec 31 10:21 CST 2002
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    last visit: Fri Oct 24 07:16 CST 2014
    [RELATED]

    I presume you have also cleaned the throttle body. It sounds as thought the idle air control valve is not functioning correctly.








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      rough idle on '90 740 gl 700 1990

      posted by  dan90 on  Wed Jan 1 05:55 CST 2003
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      where is the idle air control valve? can it be cleaned or must it be replaced?
      thanks
      dan








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        rough idle on '90 740 gl 700 1990

        posted by  nanolund on  Wed Jan 1 22:39 CST 2003
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        the IAC is just below the 1st intake manifold. It has 2 vacumn hoses and an electrical connection (optional). It is a murder to take of. I had to remove the intake manifold to unscrew it. But before you take it off, check you can buy one first. Mine cost about £70 in the UK. Good luck







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