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Thread: E66 Intermittent Starting Problem

  1. #1
    Join Date
    Sep 2018
    Location
    Ohio
    Posts
    6
    My Cars
    2008 760Li

    E66 Intermittent Starting Problem

    Hi all, new to the forum and new to BMW ownership.

    I have a question regarding my 760 sometimes not wanting to start. Usually after driving it just a short distance, maybe a couple miles for a beer run.. the car will not crank. When this happens, I can try to start it 5 or 6 more times and it will finally get going. I have noticed that on a couple of occasions it will crank for a fraction of a second but most times nothing.

    I did some research and I am thinking possibly a bad ISM module or crank position sensor, but I am no expert by any means. Any ideas/info would be greatly appreciated

  2. #2
    Join Date
    Sep 2018
    Location
    Ohio
    Posts
    6
    My Cars
    2008 760Li
    Well, I ordered a new ISM module.. cheap enough, super easy to replace, may as well try it. Any other suggestions are very welcome if I am on the wrong track, but I will keep updating the thread as I know more in case anyone else can use this as a reference

  3. #3
    Join Date
    Sep 2018
    Location
    Ohio
    Posts
    6
    My Cars
    2008 760Li
    The problem finally happened in my garage where I could troubleshoot. Battery voltage was 12.06 on the terminals, diagnostic screen read 11.12 ish V. I reseated the battery connections and diagnostic registered 11.7 and the car started. Shut off and tried again, nothing.. diagnostic reading back down 11.3.V. Any suggestions on what product to use to improve connection on the battery terminals?

    - - - Updated - - -

    Also, anyone know what kind of craziness it going to show me on the dash after I remove the battery?

    (Moderators, can this thread be moved to general mechanical forum for more visibility and hopefully more advice?)
    Last edited by ZeroCool419; 09-04-2018 at 08:40 PM.

  4. #4
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    How old is the battery

  5. #5
    Join Date
    Sep 2018
    Location
    Ohio
    Posts
    6
    My Cars
    2008 760Li
    I do not know have owned the car less than a month. It is a OEM battery complete with the BMW branding on it so last it was changed must have been at a dealership. Battery tested good at the auto part store.

  6. #6
    Join Date
    Sep 2018
    Location
    Ohio
    Posts
    6
    My Cars
    2008 760Li
    New ISM arrived today. The voltage discrepancy is gone and seems to be starting just fine ��

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