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Thread: Rpm surging at idle

  1. 05-05-2004, 01:32 AM #1
    polvoson
    polvoson is offline New Member
    Join Date
    May 2004
    Location
    BC Canada
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    My Cars
    1987 325i, 1961 MB Unimog 404

    Rpm surging at idle

    Hi Guys
    Well i bought that rebuilt 96 318i. So far so good. Handles well, and is pretty quick. One issue that I noticed that was not there during the test drive: while sitting at idle just after coming to a stop, the motor surges from about 900rpm to 1300 , and back. It does this almost every time i come to a stop, then it stops after maybe 10 surges. The surges are quick almost as if I was blipping the throttle.
    Any ideas?

    Paul
    87 325i
    96 318i
    61 MB Unimog
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  2. 05-05-2004, 02:42 PM #2
    XOC's Avatar
    XOC
    XOC is offline Existentially Confounded
    Join Date
    May 2001
    Location
    San Diego
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    Ninety-Nine SuperCharged TechnoViolet Em Three
    This may sound weird, but how is the brake fluid level?
    Lee
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  3. 05-06-2004, 01:42 AM #3
    polvoson
    polvoson is offline New Member
    Join Date
    May 2004
    Location
    BC Canada
    Posts
    6
    My Cars
    1987 325i, 1961 MB Unimog 404
    Well after reading some other boards I fixed the problem today.
    I took apart the throttle body, and cleaned it, and also cleaned all the contacts on the two electrical connections on the throttle body.
    Then I adjusted the idle.
    She is happy as a clam now, no more surging idles nicely at about 800 rpm.
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