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erratic idle/stalling after unplugging battery..

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    erratic idle/stalling after unplugging battery..

    After reading some posts, I unplugged my battery for 10 min. to restart my CPU. The reason why I did this, was because when I bought my 89 325i a couple days ago, the idle was too high. It wasn't TOO high, it was at 1k RPM.. but only after the car was warmed up AND in park. when I drive, the idle sits right above 500 RPM. Its only when I put it in park that the idle got high.

    Now.. I was doing a lot of research on these problems, and one of the "at home" possible fixes, I guys you can call it, was to unplug the battery for 10 minutes to restart the CPU. Well, this made it 10x worse.

    Now that I plugged the battery back in and started the car, the idle is extremely erratic along with my gauges. The very first time I started the car the, the car stalled about 10 sec. after starting.. 'red flag.' after that I tried starting the car again, and i feathered the gas a little so the car wouldnt die. The car really wanted to die and the throttle response was VERY poor! When I would hit the gas, it would take it a couple seconds to register, and even then it was very poor. So it was late at night, and I decided to take it out of the lot, and to get on it a little to see if it could, snap out of it or something. After it warmed up, it did get better, but regardless it was still poor! It's really bizarre, I can't figure it out. It really reminded me of a problem that I had with my old E30 with the intake manifold gasket.. but I don't know how unplugging a battery can all of the sudden destroy the gasket.

    I don't know if you guys have any insight on this, but if you do, I would GREATLY appreciate any tips/information! If you need anymore information, just let me know.

    Thanks friends!
    Metal & E30's

    #2
    That sounds most like the result of intake leaks and/or a sticky ICV and/or a bad Throttle Position Switch. Remove the ICV and clean it with carb cleaner until the vane moves freeely. Use an Ohmmeter or test light to see if the idle switch in the TPS is good. If the O2 sensor has 100k on it, replace it. Then have a shop run a smoke test on the intake and repair the leaks found.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

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      #3
      Thank you for all the advise!! Yeah it seems like a leak to me at this point. I appreciate you taking the time to help me.
      Metal & E30's

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