What are the minimum requirements for the ecu to operate

[daveson]

Probably not your problem, I mention this only cause I had the same problem, it would idle for about one minute, then stop. Eventually I replaced the fuel injection computer and it was problem solved. But it was probably just dirty connections. Clean the motronic connections, and other connectors too. There was a thread about this somewhere.

[Laitch]

How about showing the Motronic pin numbers for each wire?

I'm not sure where I would get that information

You'd get that information from the drawings at the link frankenduck posted in Reply #1 of this thread.

[Jon72]

Alright there was a few problems and I'm getting much closer to a solution the fuel lines were backwards and injector 3 had a loose connection
What cycles the injectors on and off

[Laitch]

The Motronic Control Unit under the seat.

Click on the link at the bottom of this post to download an illustrated document to help you understand how your Brick's Motronic engine management system works. This and other BMW training documents are significant contributions to the knowledge base here made by member Volador, who is likely flying somewhere and using the opportunity to find fish to conquer.

[Jon72]

It's running good now

[Laitch]

Can you sum up what you did to make it start running good, Jon?

[Freekwillem]

Powerbrick posted their wirediagram a few days ago.