1992 BMW 320i (E30) auto Idle problem caused by faulty engine control unit

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  1. 1992 BMW 320i (E30) auto Idle problem caused by faulty engine control unit 
    #1
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    NewbieBMWuser's Car Details
    Model of Car:
    320i SE Auto
    Year of Manufacture:
    1992
    Transmission Type:
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    Hi, I've had an intermittent idle problem that's getting worse. Car starts fine, but after it's warmed up, it starts to rev too high in idle. This can sometimes be controlled by pumping brake hard (brings it down to normal level) though not always. Sometimes revs up to 2500 without touching the accelerator - other times it may stall in neutral. Some days it runs fine. Had the idle valve control cleaned, which seemed to help for a while, then replaced. But replacement valve hasn't solved problem. Took to BMW approved garage. They say that engine control unit is fried due to water getting in (design flaw of these earlier models - it has been raining a lot!) and will cost over £1000 to replace - but they can't guarantee this will fix the problem.

    Questions:
    1. Does ECU sound like it's the problem here?
    2. Is that a reasonable quote for replacing ECU?

    Any advice appreciated. Apologies if I've not phrased this well - I'm not mechanical and new to the forum.

    Thanks.
     
     

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    #2
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    OskiUK's Car Details
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    1999
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    1. Wouldn't be so sure
    2. No, it is not

    I'd check throttle position sensor first and get it diagnosed with some obd stuff.
     
     

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    #3
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    1. Throttle Position Sensor
    2. MAF hose split
    3. Crank Position Sensor

    With your model you can do what's called a 'flash or 'blink' test' ... You might be able to diagnose it yourself. Just Google more info for the info the dashboard gives you.

    Here's a YouTube video which should get you started:

    =Turn ignition on, then press gas pedal 5 times. this will initiate the flash codes for the OBDI system. Video shows code 1216. Throttle potentiometer=





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    #4
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    TheEnd's Car Details
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    ^ that needs some wiring to be done, it's a US thing.
     
     

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    #5
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    Quote Originally Posted by TheEnd View Post
    ^ that needs some wiring to be done, it's a US thing.
    ... Ah? - Thought it was just OBDII you couldn't do it with? .. Didn't know it was country specific.
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    #6
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    You can wire it in, and you might need to fit a bulb, but I bet there has collectively been days wasted with people stabbing the pedal hoping for a flash!

    The US had working check engine lights from the late 80's, early 90's, and then OBD2 from 1996.

    Europe had none of that until EOBD in 2001. In other words, there are no OBD2 cars in the UK, just cars that have some parts of that system.
     
     

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    #7
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    ^ Thanks for the info.
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