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Car Forum / BMW Cars / October 20051998 E36 M3 convertible - after the battery is re-connected
I am planning to do some work on the car, (replace speaker, adjust conv top, replace microfilter), before which, everywhere I read, it seems advisable to disconnect the battery. After re-connecting the battery, a friend with another M3 said the engine did not run very well, but got better after a good drive through all gears, all speeds etc. has anyone had a similar experience? Sounds like the engine management system does not like to be without power. I have the original radio code card, inc. the serial number, so no worries there. Other than the radio code, what other electrics need attention after re-connecting the battery? Ta > I am planning to do some work on the car, (replace speaker, adjust conv > top, replace microfilter), before which, everywhere I read, it seems > advisable to disconnect the battery. Doesn't look like you're doing anything that actually needs the battery disconnected. Unless working near the battery where there is a chance of shorting the terminals (through dropped tools, etc) or on anything not protected by fuses. > After re-connecting the battery, a friend with another M3 said the > engine did not run very well, but got better after a good drive through > all gears, all speeds etc. has anyone had a similar experience? Sounds > like the engine management system does not like to be without power. Dunno about the M3. It might have gone back to a low octane petrol default, but should have changed back pretty quickly. > I have the original radio code card, inc. the serial number, so no > worries there. Other than the radio code, what other electrics need > attention after re-connecting the battery? On my 528 of a similar age, nothing. Not even the radio code as it doesn't have one. Just had to re-set the clock and radio station memory.  Signature*I don't work here. I'm a consultant Dave Plowman dave@davenoise.co.uk London SW To e-mail, change noise into sound. >> I am planning to do some work on the car, (replace speaker, adjust conv >> top, replace microfilter), before which, everywhere I read, it seems [quoted text clipped - 4 lines] > shorting the terminals (through dropped tools, etc) or on anything not > protected by fuses. The microfilter is pretty close to the airbag, and the book recommends disconnecting the battery to prevent the airbag from going off in your face. Thank you Jeff. > The microfilter is pretty close to the airbag, and the book recommends > disconnecting the battery to prevent the airbag from going off in your > face. The microfilter is below and behind the dashboard and behind the heater.. The airbag is above the glovebox. If you could set off the airbag while replacing the microfilter you're a magician. Well, the glove box is immediately below the airbag, and is in the way of other stuff that has to come out/off to get to the filter. So, tripping the airbag doesn't take a magician, it only takes a bafoon. And since the factory doesn't know if you're a bafoon or not, then everybody is recommended to disconnect the battery. >> The microfilter is pretty close to the airbag, and the book recommends >> disconnecting the battery to prevent the airbag from going off in your [quoted text clipped - 3 lines] > The airbag is above the glovebox. If you could set off the airbag while > replacing the microfilter you're a magician. > I am planning to do some work on the car, (replace speaker, adjust conv > top, replace microfilter), before which, everywhere I read, it seems > advisable to disconnect the battery. Perhaps - but I see nothing you've mentioned that I would disconnect the battery for. > After re-connecting the battery, a friend with another M3 said the > engine did not run very well, but got better after a good drive through > all gears, all speeds etc. has anyone had a similar experience? Sounds > like the engine management system does not like to be without power. I think your friend was imagining things. On later models the "adaptation memory" is not volatile.. to reset it you have to use a code reader capable of reading BMW codes. > I have the original radio code card, inc. the serial number, so no > worries there. Other than the radio code, what other electrics need > attention after re-connecting the battery? You'll have to reset the OBC-MID - clock, speed reminders, whatever.. Thanks. What is "OBC-MID"? BTW the Bentley service manual does recommend disconnecting the battery before working on anything near airbags (in my case, glovebox, door speaker). That is what I plan on doing. Also, it's never a bad idea to disconnect the battery when working near electrical wiring - cutting a live wire can cause a short. Best case blown fuse, worst case small fire, either case best avoided. Safety first. > Thanks. What is "OBC-MID"? On-Board-Computer, Multi-Instrument-Display. The thing below your heater controls.. where the clock lives. Well, you have the windows to re-initialize, but this is a matter of running them to the top while holding the button the whole way. Then, there's the radio, but you have that covered. As for the ECU, it resets itself very quickly just by going for a short drive. I've never experienced a problem with the ECU after disconnecting the battery, but I've heard the complaint before. It's a non-issue. Oh, you have to reset the clock. >I am planning to do some work on the car, (replace speaker, adjust conv > top, replace microfilter), before which, everywhere I read, it seems [quoted text clipped - 10 lines] > > Ta |
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