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Thread: Desperate need of '85 E23 745i ECU/DME

  1. #1
    Join Date
    Nov 2007
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    SoCal, Hell
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    My Cars
    '91 325iA, '91 318iS

    Exclamation Desperate need of '85 E23 745i ECU/DME

    IMG_7866.jpg
    In desperate search of a complete replacement ECU for my new to me '85 745i, or information on how to repair my original DME.


    The original ECU in my car will not fire the coil or injectors, despite verifying the function of the wire harness itself, fuses, main DME relay, ignition coil, ignition switch, battery grounds and 12v leads, crank position sensors, and the double checking the timing tab on the torque converter.

    When I first began testing the engine electronics, I installed an injector noid test light on one of the fuel injector wire connectors, and I also installed a calibrated spark tester on the main ignition coil lead.
    Upon turning the key on, and without cranking the engine, the injector noid light lit up continuously without pulsing, and the ignition coil fired for less than a second, and did not fire again.
    Despite the engine cranking, +12v DC to both sides of coil, and properly functioning crank position sensors, there was no signs of life, no pulse from the noid light, and no further spark from the coil.
    Repeated attempts to start the car made no difference, and eventually the injector noid light stopped illuminating completely, and the coil ceased to fire on any other key off/key on attempts.

    Any advice would be greatly appreciated, I'll even entertain aftermarket ECU solutions if anyone is aware of one!


    BMW part #12 14 1 286 050
    Bosch part #0 261 200 013
    Last edited by E30 FTW; 12-30-2017 at 04:26 AM.

    •2000 X5 4.4i •1991 325i •1991 318iS •1984 318i •1985 745i •1988 635CSi •1972 2002 •1972 Datsun 510 Wagon •1978 Datsun 280z SCCA racecar •1978 Mercedes-Benz 450SEL •1978 Silver Streak Continental •1963 Jeep Gladiator J300 •1994 Ford Ranger

  2. #2
    Join Date
    Sep 2009
    Location
    Denver, Colorado
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    2,876
    My Cars
    1985 535i, 1980 635CSi
    Are you sure you can't just do an ECU solder repair to an inside transistor?

    http://e28-535i.com/technical/e28-ECU_Repair.php

  3. #3
    Join Date
    Nov 2007
    Location
    SoCal, Hell
    Posts
    123
    My Cars
    '91 325iA, '91 318iS
    Quote Originally Posted by tschultz View Post
    Are you sure you can't just do an ECU solder repair to an inside transistor?

    http://e28-535i.com/technical/e28-ECU_Repair.php
    Already cracked the DME cover open and reflowed a few obviously cracked solder joints on the large silver darlington driver transistors. Didn't make a difference...

    •2000 X5 4.4i •1991 325i •1991 318iS •1984 318i •1985 745i •1988 635CSi •1972 2002 •1972 Datsun 510 Wagon •1978 Datsun 280z SCCA racecar •1978 Mercedes-Benz 450SEL •1978 Silver Streak Continental •1963 Jeep Gladiator J300 •1994 Ford Ranger

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