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Old 06-11-2013, 02:26 AM   #1
Darkestchoda
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first E30,first thread

Hi max. Bought the car like a year ago moved it to a underground ,now trying to fix the car so I can drive the car and restart it without a boost. I just got a new battery but I dont really know what I'm doing lol. Any help would be great
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Old 06-11-2013, 02:29 AM   #2
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Little bit about the car it's engine is a m42 all the hoses look like crap the battery is the back which I thought was cool
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Old 06-11-2013, 07:30 AM   #3
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Welcome!

These cars are fun and easy to work with. Tons of info about your motor on m42club.com.

This should help for the hoses and vac lines...
http://www.m42club.com/forum/index.php?topic=2742.315
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Old 06-11-2013, 09:34 AM   #4
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if you don't know what the heck you're doing trying to install a battery? then I would suggest giving it to someone who does. Seriously. Installing a battery without a reverse polarity will damage your car. notice in the trunk you don't have a red cable to indicate positive like on the battery? well the wire closest to the front of the car is positive. wire attached to the body is negative. if you can't see the battery their might be a cover over it on the right side.
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Old 06-11-2013, 12:43 PM   #5
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I already installed the battery I figured that the cable going to the body was the negative so the other one had to be the positive it's this loss of power that's puzzling me. When I go to start it there is no power when I get a boost it starts no problem and runs nice but if I turn it off I can't start it again any thoughts as to why that is?
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Old 06-11-2013, 12:44 PM   #6
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Thanks BMe30 that link helped alot
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Old 06-11-2013, 02:08 PM   #7
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If the battery is new you may want to look into alternator issues... Or you just got a bad new battery. Or the cranking amps are too low. Just guessing here
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Old 06-11-2013, 02:32 PM   #8
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My buddy tested the battery with a volt meter and when the car is running it was sitting at 13 v but when I turn it off the battery drops to 7v and slowly goes lower by like 0.01 v per second so I may need a new battery
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Old 06-15-2013, 08:47 AM   #9
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But didn't you just say you replaced the battery? Check the ground connections for corrosion but it doesn't seem likely that would cause your symptoms.

Go to Princess Auto or Napa and get a cheap test light. With the key off try seeing if there is power to anything there shouldn't be. That would explain a power drain.

Another thing that is concerning is that on a 4 cylinder car the battery should be up front between the pass. side strut tower and the firewall. Seems as though the previous owner may have put it in the trunk themselves and could have botched it. Can you post some pictures of the cables going to the battery in the trunk as well as the power distribution block on the firewall above the battery tray?
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Old 06-15-2013, 09:29 AM   #10
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this thread is civil
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Old 06-15-2013, 10:58 AM   #11
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My 91 m42 batt is in the trunk. If im not mistaken they all are.
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Old 06-15-2013, 12:55 PM   #12
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Originally Posted by Roysneon View Post
But didn't you just say you replaced the battery? Check the ground connections for corrosion but it doesn't seem likely that would cause your symptoms.

Go to Princess Auto or Napa and get a cheap test light. With the key off try seeing if there is power to anything there shouldn't be. That would explain a power drain.

Another thing that is concerning is that on a 4 cylinder car the battery should be up front between the pass. side strut tower and the firewall. Seems as though the previous owner may have put it in the trunk themselves and could have botched it. Can you post some pictures of the cables going to the battery in the trunk as well as the power distribution block on the firewall above the battery tray?
Batteries are only up front on the convertible models.
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I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 06-15-2013, 01:00 PM   #13
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the voltage should be around 12v or slightly higher when there is no current draw. when the car is running the voltage should spike due to the charging of the alternator. A new battery shouldn't die or drain that rapidly if there is a charging issue. You may just have a poorly charged battery or bad one. Put the battery on a charger and trickle charge the battery overnight. the lower the amperage and longer the charge the better. since it is not completely dead you won't need to use high amp. charging. after that, install it again and see what your results are. Then if you still have problems move to the charging system. Test at the alternator for proper voltage. check engine light usually flickers or comes on when the alt is going or gone. wouldn't hurt as suggested to check the ground strap from the body to the oil pan on the left had side engine bay. This is the main ground.

Lastly, make sure your battery cables are securely attached to the terminals.
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I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 06-17-2013, 02:49 PM   #14
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Thanks for input everyone I have to check all this out ill post my finds
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Old 06-17-2013, 05:33 PM   #15
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Darkestchoda hehehe
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