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Thread: E23 miss at 4k and aux fan replacement

  1. #1
    Join Date
    Sep 2021
    Location
    New Zealand
    Posts
    6
    My Cars
    1986 BMW 728IA (E23)

    E23 miss at 4k and aux fan replacement

    Hi all. My recent ourchase 86 NZ New 728i has a hesitation at around 4k rpm every time. I don't normally rev it that high but now I know of this hesitation I've been doing it a bit too ee what happens. Car pulls smooth through to about 3900rpm then falls flat on its face, jerks a bit then starts to pull through again until redline. Anyone have any ideas where to start with diagnostics?

    Next question is u have to replace the factory electric fan on the front of the radiator. Wondering if there's there's write up on this or if someone can suggest the easiest way to get to it. I'm sure I can work it out if need be, but the joy of the internet is you can normally do it right straight away as someone has done a write up on how to do it.

    Thanks.

  2. #2
    Join Date
    Jun 2010
    Location
    TX
    Posts
    4,487
    My Cars
    1983/84/85 745i

    Thumbs up

    VDO has a nice replacement auxiliary fan for these - FA70745 I have only been able to remove it by removing the bumper. While there is a great time to clean the A/C condenser as it will be very dirty.

    For the ignition, I do not have too much experience with non turbo Ljets but guessing it is similar. How is the power from 4000-6000? Correct spark plugs? How is the cap and rotor? Timing? Does it use a distributor with advance and retard?
    I make E23 parts.
    09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
    10/1984 745i
    11/1984 745i
    11/1984 735i (10:1-265/6)
    Ford, MB, and GM round out the pack.



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