Question about 1990 BMW 7 Series

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1990 750il bmw

I have a 1990 750il. I traded my other car for it,anyway it has been siting for about 3 years with a dead battery.The car starts fine but you step on the gas and rpm only go to about 1700 , and i got the pedal to the floor.

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You may need to have a throttle body adaptation done at the dealership please rate -jeff

Posted on Sep 01, 2008

  • anthonyeasto Jul 17, 2011

    if you eml light stays on, more then likely your electronic throttle bodies need rebuilding. if it doesn't come on at all, then your guage cluster need to be either replaced, or fixed. It's a common problem on the e32 v12's

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The jumper cable connection point under the hood is directly connected to the battery. If you are not familiar with charging batteries, it is much better that you connect your charger under the hood.
Leave the ignition turned off. Connect the positive (red) clamp to the jumper cable connector under the hood. Connect the negative (black) clamp to a bare metal ground point such as a bolt or lifting lug on the engine. Then plug in and turn on the charger. Let it charge for several hours before trying to start the car.
If this is the original battery, it likely won't ever really work well again. Maintenance free batteries do not respond well to being completely discharged, and at 7+ years of age, it is due for replacement anyway. I had to replace the battery in my wife's 2004 BMW 330 about four months ago, and it had never been allowed to go dead,

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The battery for your car is located in the trunk. There are jumper terminals located under the hood in the front of your car. There is a Red (+) terminal that is under a little black cover on the passenger side of the engine bay near the firewall. Right near that is a silver/gray bolt that is bolted to the frame of the car. This is the negative terminal.

Make sure both cars are and all accessories are off:
1) Connect the Postive cable to the dead battery
2) Connect the Positive cable to the good (BMW) terminal
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Several years in storage without being started would be a problem on the battery, even disconnected. I'm sure a jump would start the car but I doubt the battery would hold a charge. How old is the battery? If it were 2-3 years old already it's probably at the end of it's life anyways.

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My battery is running dead every two days! I jump it and starts up, after several minutes with the jumper pack cables! This has happened 4 to 5 times since I purchased the vehicle just 2 weeks ago...Am I...


If the key is in off position it won't drain battery.
You may have battery draw in that vehicle , or the battery itself is going out.(BMW batteries are good for 4-5 years)
Both cases needs to be checked by workshop , cause BMW very sensetive to the voltage drop. When you disconnect battery you may need to perform some settings adaptation after you replace it or connect it back.
New BMW requared to reset computer even after brake job and battery replacement.

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2000 BMW 740i starting/battery problem. Battery


I am having the same problem same car & year

did you ever find a solution?

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Battery dead, or starter problem? My 1992 381i won't start. The battery has at least some juice in it (I can turn the headlights and interior lights on). But the digital clock has re-set to 0:00,...


It is most likely a flat or dead battery but first check the battery terminals are clean and firmly attached.
If all above checks ok replace the battery.

There are several reasons why an attempted jump start may not have worked, such as :-
1) the jump cables used are poor quality,
or
2) the battery used as a power source may not have sufficient capacity.

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Take your battery to the parts store and have them test it. If its an original replace it anyways batteries only have a 5 to 7 year life span. on another note when your window walked off they may have damaged a switch in the door. this may be causing your display issues.

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Pc board


This solution may be too late but will help others with same problem.
The E30 series have 2 rechargeable batteries on the (Service Indicator) SI board WHEN FITTED. located within the dash unit ( tacho/speedo/temp/fuel Unit) they have a life span of 6 years however mine lasted 17years not bad for a rechargeable batt
anyway back to the point the effects of a buggered batts are
  • Inconsistent taco and temp guages
  • background radio noise (old model radios)
  • and THE INABILITY TO TURN SERVICE LIGHTS OFF !
The batts can be found in CONRAD (germany) MAPLIN (uk)
the cos of the batts are approx £3
the new board costs direct from BMW with trade discount approx £200 in 2007
have fun (soldering required to replace batts) :-]

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