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Old 06-13-2018, 06:57 PM   #1
Marle30
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Question No start ‘89 325i

Recently inherited my daughter’s ‘89 convertible.
With no warning, it will not start. New main relay, new fuel pump relay, new fuel pump. Been diagnosing the problem - no 12volt at coil +15, checked ignition switch, now have jumped green wires at ecu relay, and have 12 volts at coil. I believe it is a failed ecu relay. Question for those who have dealt with this relay, does it also control the injectors and fuel pump? Fuel pump works when relay is jumped, but still will not start. Thanks!
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Old 06-13-2018, 07:16 PM   #2
ButtJuice
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Check fuses? 🤷
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Old 06-13-2018, 07:36 PM   #3
Marle30
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All fuses have been checked. Thanks!
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Old 06-17-2018, 12:00 AM   #4
RobDog
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Does the replacement main relay have 2 pin 87’s and not an 87/87a configuration? The main relay is unique and turns on power to 2 pins (87/87) at the same time, where as a standard relay switches power between 2 pins (87/87a). If you have the wrong relay the car will not start because only one pin will be getting power, so only half the engine electronics will be getting power.
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Old 06-17-2018, 03:06 AM   #5
george graves
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^good post.
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