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High idle on 940 GLE 16V 900 1992

posted by  someone claiming to be RobertD on  Sun Nov 1 21:17 CST 2015 [RELATED]

Hello everybody,

Just got my hands on '92 940 16 valve with 110k km. The problem is that when I stop the car the RPM is about 1500. When I crank cold or hot engine it is running about 650, 700 RPM, when I drive it and come to stop, even when I shift to P and release the brake pedal the RPM goes high.

How to solve this problem?








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    High idle on 940 GLE 16V 900 1992

    posted by  spook on  Mon Nov 2 06:03 CST 2015
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 08:06 CST 2014
    [RELATED]

    Dear RobertD,

    Hope you're well. Are there any codes? If so, report them.

    If there are no codes, clean the idle air control valve (IACV, see FAQs for the "how to"). If a cleaning does not help, replace the IACV with a known-good used unit. If that cures the problem, put in a new IACV or simply get another used unit, test it, mark on it the test results/date, and put it in your spare parts inventory. If an IACV change does not help, so report and we'll go from there.

    Hope this helps.

    Yours faithfully,

    Spook








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      High idle on 940 GLE 16V 900 1992

      posted by  someone claiming to be RobertD on  Sun Nov 29 21:21 CST 2015 [RELATED]

      No codes, cleaned IACV - no improvement. What next?








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        High idle on 940 GLE 16V 900 1992

        posted by  spook on  Mon Nov 30 06:53 CST 2015
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Fri Oct 24 08:06 CST 2014
        [RELATED]

        Dear RobertD,

        Hope you're well. Replace the Idle Air Control Valve (IACV) with a new unit, or with a "known good" unit, i.e., an IACV that has been installed in a smooth-running car, that still ran smoothly after installation of that used IACV.

        If you don't have a spare "known good" IACV, get two (or three) used IACVs and install them, one after the other. If the car runs smoothly, mark the IACVs "OK" with a date and leave in place one of the used units, that causes the car to idle properly, i.e., about 700 revolutions/minute (RPM).

        If you can't find known good IACVs in a salvage yard in your locale, so report.

        Hope this helps.

        Yours faithfully,

        Spook








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          High idle on 940 GLE 16V 900 1992

          posted by  someone claiming to be RobertD on  Wed Jun 15 07:16 CST 2016 [RELATED]

          Turned out to be MAF.








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            Same motor, same issue 900 1992

            posted by  Andrew in AL on  Wed Jun 15 16:27 CST 2016
            Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
            last visit: Fri Oct 24 06:17 CST 2014
            [RELATED]

            Just bought a 90 740GLE ..same motor, same issue. The wholesaler had replaced the MAF prior to purchase, supposedly.

            Did you just swap the unit out ...or was it tested? How did you get to the conclusion it was the MAF?

            Thanks
            --
            "Do you think that's air you're breathing now'? (The Matrix 1999) '94 940T (463K+), 92 245 (300K+), 90 740 (148k)







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