91 525i DME

Tiny
AMD
  • MEMBER
  • 1991 BMW 525I
  • FWD
  • AUTOMATIC
  • 180 MILES
This BMW looses power at the DME. What should I look for?
It will drive for about 10 mins. And then cutout or loose power. Help
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Friday, December 17th, 2010 AT 3:13 AM

13 Replies

Tiny
DR. HAGERTY
  • MEMBER
Look to where the power comes from, the main relay.
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Friday, December 17th, 2010 AT 3:39 AM
Tiny
AMD
  • MEMBER
I have replaced air mass, main relay, checked fuses, sensors, checked all lines, tested electrical-traced wiring even replaced the engine harness! I am ready to light the car on fire! Any suggestions?
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Friday, December 17th, 2010 AT 5:39 PM
Tiny
DR. HAGERTY
  • MEMBER
Send the last 7 of the VIN please
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Saturday, December 18th, 2010 AT 3:06 AM
Tiny
AMD
  • MEMBER
Thank you Dr. Hagerty for your help
the vin# WBAHD531XMBF95698
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Monday, December 20th, 2010 AT 5:25 PM
Tiny
DR. HAGERTY
  • MEMBER
The DME may be at fault. There are several numbers on the DME, tell me those numbers please.
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Monday, December 20th, 2010 AT 5:34 PM
Tiny
AMD
  • MEMBER
We also exchanged DME with another vehicle's DME-(same year and model) and that didn't make a difference. Best way without spending $$.
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Monday, December 20th, 2010 AT 6:06 PM
Tiny
DR. HAGERTY
  • MEMBER
Monitor the fuel pressure, maybe it has a plugged fuel filter or a pump that's close to the brink.
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Monday, December 20th, 2010 AT 6:24 PM
Tiny
AMD
  • MEMBER
We did this also, actually early on. I'm telling you this car is frustrating!
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Monday, December 20th, 2010 AT 8:09 PM
Tiny
DR. HAGERTY
  • MEMBER
So you have a car that seems to be cutting out or dying at about 10 minutes into the drive cycle, you have done everything you can reasonably do, and you are at your wits end. The DME power is mysteriously going somewhere, but you dont where. You have thrown the kitchen sink at it. I would say that the thing to do is to find someone who has, or has access to the proprietary scan tool for the BMW cars of that era. It is called a GT-1 and it can monitor the live data stream, and display stored faults.
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Monday, December 20th, 2010 AT 10:33 PM
Tiny
AMD
  • MEMBER
We had the Autologic Computer Diagnostic test 2 different times. It can not read fault codes!
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Tuesday, December 21st, 2010 AT 12:29 AM
Tiny
DR. HAGERTY
  • MEMBER
There is a good place to start. If the codes can't be read then the issue might be the communication bus is shorted or otherwise inoperative.
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Tuesday, December 21st, 2010 AT 10:39 AM
Tiny
AMD
  • MEMBER
We had the comm. Bus checked / tested.
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Wednesday, December 22nd, 2010 AT 12:46 AM
Tiny
DR. HAGERTY
  • MEMBER
Did you now. What did you find.
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Wednesday, December 22nd, 2010 AT 4:40 AM

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