Question about 1998 BMW Z3 Roadster

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1997 bmw z3 - battery compartment filled with water and car wouldn't even turn much less start. Cleaned out etc. and replaced battery and now can get the lights but it won't turn over to start. Any ideas? Thanks!

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  • kim69 Dec 10, 2009

    We checked into that and nothing else seemed to be affected. I've seen others with similar posts but no answers. The car was moved outside for 1 night and moved back in with no problem. Then when I started it again a couple weeks later it wouldn't even turn for the dash lights. When replaced the batter the dash lights come on again but won't actually start.

  • kim69 Dec 10, 2009

    I live in Florida - we got dumped with rain that night... I will check out those and see if something doesn't show itself as a problem.

  • kim69 Dec 10, 2009

    thank you - that is very helpful with some ideas on where to start and what to do. I will try them out this afternoon with my husband and see if we can't get anywhere. Thanks!



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From your description of the issue, I would troubleshoot by checking all connections. From what you have said, there was water involved, and cleaning...possibly the wet area and the moisture has aided in creating a short or a corroded connection..that is where I would start, simply because of events that lead up to the car not turning over. Ususally cleaning the battery area involves washing down some acid...this can corrode connections...check grounds. It sounds like your switch is working properly, I am assuming that when you switch it on, your accessories work. If this is the case, you should start your troubleshooting under the hood. Concentrate on the area where the moisture was and branch out from there. It is possible to have a good enough battery connection to get lights but not good enough to actuate the starter. Try this, switch on the lights then have a helper turn the switch to start, if the lights do not dim, you do not have power going to the starter. If this is the case, you can go to the starter connections and work backwards to the battery, paying attention to the starter selenoid and the ground.connections. Your problem will prove to be a simple patient and check these connections. Also check the starter relay and fuse. Good Luck! I hope you find this to be very helpful!

Posted on Dec 10, 2009

  • Hal Hallman Dec 10, 2009

    Good Luck...I believe it is something simple, but caused by the water...probably.

  • Hal Hallman Dec 10, 2009

    Yea...we need to hurry and get you folks mobile again in your Beemer!


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If the bat compartment filled with water then so did other things...I would think your motor has injested some water and has hydro lock (cylinders full of water) need to take it to the shop to confirm how much damage has been caused. You can also remove all the spark plugs then try cranking the motor which should spit the water out if in the cylinders (replace them too) and you may have other electrical components that have gotten wet and are malfuctioning (eventhe starter)

Posted on Dec 10, 2009

  • James Brooks
    James Brooks Dec 10, 2009

    How does the battery compartment get filled with water over night?? that's your million dollar question and definitely the answer to your problem. Check your electrical from the battery to the starter and make sure your geting power there, if not I would lean towards the igniton switch/module

  • James Brooks
    James Brooks Dec 10, 2009

    No problem, it sounds like the moisture may have shorted something and if it happens regurlarly at some point it's going to fail and not finding the problem is very critical.



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