ECU ?'s, injector wiring ?

[ethirdy]

First question: I have a stack of ECU's from old cars, not sure what belongs to what, need an ecu for my 87 325is. Here's what I have:
175
154
153
382
525

What will fit, what are they from, etc?

Also, I replaced the wiring harness in the engine bay, and the numbers labelling the injector plugs came off #3 and #4 fell off - now I don't know which plug goes on which injector. How can I tell, or does it not matter? (I'm assuming it does, as the injectors wouldn't be firing at the right time?)

[jlevie]

The injectors are organized as two banks of three. Bank 1 is cylinders 1,3&5 and bank 2 is cylinders 2,4&6. With all injectors disconnected and the DME disconnected, use an ohmmeter to probe one of the unknown connectors and the connector for cylinder 1 and cylinder 6 to determine whether it is the #3 or #4 injector. Then mark both as appropriate. Note that one pin of each connector is common to all injectors (power), but the other pin goes to the bank 1 or bank 2 splice point.

The 153 DME would be OE equipment for an 87 325is. I think the 525 might also work. Dunno about the others.