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Old 12-07-2012, 11:05 PM   #1
andycai
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Question How to jumpstart 2002 M3

Hi Folks, I came back from vacation and found my M3 battery is discharged. I tried to jumpstart it using another car (2009 VW Routan) without success(lights are on but car won't start). Any thoughts? Thanks for the advice.

Ps. I did research before I post.
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Old 12-07-2012, 11:08 PM   #2
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Roll it down a hill and get in second..
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Old 12-07-2012, 11:09 PM   #3
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Battery is probably incredibly weak, and its possible it won't hold a charge. Either replace the battery, or let it charge for a while off of the VW while its running.
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Old 12-07-2012, 11:20 PM   #4
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Quote:
Originally Posted by 330ciandr6 View Post
Battery is probably incredibly weak, and its possible it won't hold a charge. Either replace the battery, or let it charge for a while off of the VW while its running.
Thanks
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Old 12-07-2012, 11:51 PM   #5
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When the batteries die in these cars they're typically dead.
I know when my battery died it was toast. I had to get a new one.
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Old 12-08-2012, 10:04 AM   #6
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Sounds like the battery needs to be replaced. Check it with a voltometer or multimeter though. Might be something else.
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Old 12-08-2012, 10:08 AM   #7
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Likely the original battery. Don't be fooled and throw your money away for a Bosch battery or something like that. Our cars take conventional batteries that are available all over the place. I'm not 100% sure about the M3, but for non-Ms a battery from almost any auto parts store with a good warranty/return policy will fit perfectly. There are only ~3 car battery manufacturing companies on earth. The only real difference between all the batteries on the market is the labeling and the price.
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Old 12-08-2012, 12:05 PM   #8
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If it's the original battery, then it''s likely it can't hold a charge anymore. Get a new battery. I'm not certain about M cars but I'd try to shop around for a battery instead of going to the dealer. The dealer battery is going to be expensive. Good luck.
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Old 12-08-2012, 12:13 PM   #9
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Might be time for a new battery. To prevent this from happening in the future get a battery tender.
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Old 12-08-2012, 12:30 PM   #10
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well even if your battery was dead the car should start off the donor car's battery/jump. make sure the cable connections under the hood are good and rev the donors car up. now even if it starts you should be aware like many have said to get your battery tested or plan to buy a new battery as its likely no good.

if you have time to hunt around you can get a non-dealer substitute battery for less. me I bought a Bosch battery from Pep Boys with 2 discounts so price was $118. it's an exact battery of the BMW one. it has a bit more CCA and better warranty.
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Old 12-08-2012, 12:32 PM   #11
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There could be nothing wrong with your battery, why people are immediately jumping to "it's your battery" is unnecessary.

Obviously, there are parasitic drains that over time take away from the battery, leave your car sitting long enough and you'll have a dead battery.

As far as jump starting, BMW recommends that it be jumped from the hood terminals (not directly at the battery due to a possibility of surges) and make sure you have good clean connections for the ground and power. Your connections could have enough resistance that it isn't providing a clean enough path for electricity so even though it can power on the lights, there's not enough voltage to power the starter, which needs a lot more current.
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Old 12-08-2012, 01:15 PM   #12
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Oops, I re-read you just came back from vacation and battery wouldn't start your M3. like I said, jump it as I posted or even push start it. drive it a while to charge the battery before shutting off. or charge it by a battery charger. unless the battery is old and weak you should be good to go.
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Old 12-08-2012, 01:47 PM   #13
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I had a dead car that would start. Got a jump and went for a cruise hoping it would recharge a tiny bit as it was Saturday evening and when I got home it didn't start. Tried a few times though.

I came on here and searched hoping it was just the battery and read after too many attempts the car locks out the key for theft prevention purposes. My other key started the car.

I would still get a battery and I hope that is all you need.

I have no explanation for why it wouldn't start almost immediately or for minutes later which initiated the theft prevention function and yet it did start two hours later.
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Old 12-09-2012, 09:14 AM   #14
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Hi my battery is dead now how to jumt start
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Old 12-09-2012, 09:15 AM   #15
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I have connected it with another car with the jump leads but still it's dead shall I wait
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Old 12-09-2012, 09:16 AM   #16
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My car is 318 2.0
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