91 525i DME

1991 BMW 525I
180 MILES • FWD • AUTOMATIC
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AMD
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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
Dec 16, 2010 at 7:13 PM
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DOCHAGERTY
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Look to where the power comes from, the main relay.
Dec 16, 2010 at 7:39 PM
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AMD
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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?
Dec 17, 2010 at 9:39 AM
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DOCHAGERTY
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send the last 7 of the VIN please
Dec 17, 2010 at 7:06 PM
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AMD
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Thank you Dr. Hagerty for your help
the vin# WBAHD531XMBF95698
Dec 20, 2010 at 9:25 AM
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DOCHAGERTY
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The DME may be at fault. There are several numbers on the DME, tell me those numbers please.
Dec 20, 2010 at 9:34 AM
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AMD
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We also exchanged DME with another vehicle's DME-(same year and model) and that didn't make a difference. Best way without spending $$.
Dec 20, 2010 at 10:06 AM
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DOCHAGERTY
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Monitor the fuel pressure, maybe it has a plugged fuel filter or a pump that's close to the brink.
Dec 20, 2010 at 10:24 AM
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AMD
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We did this also, actually early on. I'm telling you this car is frustrating!
Dec 20, 2010 at 12:09 PM
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DOCHAGERTY
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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.
Dec 20, 2010 at 2:33 PM
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AMD
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We had the Autologic Computer Diagnostic test 2 different times. It can not read fault codes!!
Dec 20, 2010 at 4:29 PM
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DOCHAGERTY
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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.
Dec 21, 2010 at 2:39 AM
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AMD
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We had the comm.bus checked / tested.
Dec 21, 2010 at 4:46 PM
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DOCHAGERTY
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Did you now. What did you find.
Dec 21, 2010 at 8:40 PM
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