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1989 740 Turbo wagon/ revs from 900 to 1200 during idle!? 700 1989

posted by  lvshust on  Wed Jul 10 07:35 CST 2002
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Greetings-

I have recently purchased my first brick, turbo at that. I love the car 1989 230FT (133k)but, it does not want to stop reving at idle. I have tried to adjust the idle but, no success longer than 3 or 4 hours. I would appreciate any advice!

Thanks-








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    1989 740 Turbo wagon/ revs from 900 to 1200 during idle!? 700 1989

    posted by  Matt L on  Wed Jul 10 07:57 CST 2002
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    last visit: Mon Aug 23 08:46 CST 2010
    [RELATED]

    This seems to me like a classic case of a sticky IAC (idle air control) valve. I've had this problem before. When the IAC is sticky, the small signals that usually control small adjustments to the idle speed don't work, so the computer applies a larger signal until eventually the sticky IAC breaks free, and the idle speed is adjusted TOO much, then the computer slows things down again, repeat. It's a viscious cycle.

    If you just bought this car, the PVC (positive crankcase ventilation) and IAC systems need to be cleaned out anyway. The FAQ and archives have lots of details on this subject. If you can't find them, post back for more help.

    --
    Matt L. -- Cary, NC -- '89 740 sedan -- '91 740 wagon








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      1989 740 Turbo wagon/ revs from 900 to 1200 during idle!? 700 1989

      posted by  ChrisRoss on  Wed Jul 10 13:57 CST 2002
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      Hi, I have similar problem, except the idle drops from around 900, and occasionally will buck like I hit the gas. Should I consider looikng in the same direction? It holds idle pretty well, but occasionally acts up. This is happening mostly while in gear. Thanks








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      1989 740 Turbo wagon/ revs from 900 to 1200 during idle!? 700 1989

      posted by  lvshust on  Wed Jul 10 08:56 CST 2002
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      That sounds like the exact problem! I have looked thru the FAQ but could not locate the info for cleaning these systems. Is this something I could do myself or take to the dealership?

      Thanks!-








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        1989 740 Turbo wagon/ revs from 900 to 1200 during idle!? 700 1989

        posted by  Matt L on  Wed Jul 10 09:15 CST 2002
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        last visit: Mon Aug 23 08:46 CST 2010
        [RELATED]

        If you take the car to a dealership, they will immediately want to replace the IAC for big bucks! It *might* need replacement (probably not), but cleaning and testing should be the first step before replacing.

        First remove the IAC and shoot carb cleaner through it until clean fluid comes out the other side clean. Then, bench test it by applying 12 volts to the terminals (one terminal is + and one is -... it only works one way... if you reverse the terminals no damage will be done... just try again until the thing works). After it is clean and you are convinced that the thing is clean and working, put a few drops of highly-refined oil (i.e transmission fluid) on the valve and then bench-test some more to try to work the oil into the motor bearings. Re-install and see if problem persists.


        --
        Matt L. -- Cary, NC -- '89 740 sedan -- '91 740 wagon








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    1989 740 Turbo wagon/ revs from 900 to 1200 during idle!? 700 1989

    posted by  someone claiming to be squiggy on  Wed Jul 10 07:36 CST 2002 [RELATED]

    I had a similar problem, it turned out to be the fuel pressure regulator valve.








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      1989 740 Turbo wagon/ revs from 900 to 1200 during idle!? 700 1989

      posted by  lvshust on  Wed Jul 10 07:47 CST 2002
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      was everything fine after you replaced it?/cleaned it? I see the part is not that expensive.

      thanks for the quick response!








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        1989 740 Turbo wagon/ revs from 900 to 1200 during idle!? 700 1989

        posted by  someone claiming to be motorcycletek@aol.com on  Wed Jul 10 17:04 CST 2002 [RELATED]

        My brothers 240 dl had the same herky-jerky syndrome up and down idle,we cleaned the old one first but then replaced it with a used one from the junk yard and it ildes like a dream now.







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