e30 m50 swap problems

[Earl]

That swap ran and drove without any issues when it was pulled so I would bet it is something ground related or not connected properly.

[B C]

With the megasquirted m10 it was losing signal every revolution, which looked to be a trigger wheel issue but this "new" problem that exists with the ecu/fuel pump power wiring may be the same problem the car had with the previous setup.

[SamHolzmann]

Still being stumped any chance someone who knows the wiring of an m50 swap could send me a full description of what needs to go where and to what? Would like to make it scooters this year. Thanks

[GunMetalGrey]

It puzzles me that you say it fires on starting fluid. If it is sending signal for spark I don't know why it wouldn't send injector pulse as well.
That makes me think ground, double check your grounds, make sure they are clean. You should have one wire grounded at the passenger side strut tower and one on the frame horn near the PS motor mount arm.

[SamHolzmann]

Took the injector wiring harness apart checked everything, using a noid light shows no injector pulse. Also came to the conclusion it's sending 12 volts to both positive and ground on every injector plug.

[B C]

+ on injector should have 12v any time the key is switched on, - on injector should not have continuity with ground except while firing the injector

Sounds like a power and ground are still mixed up

[GunMetalGrey]

^ This is a place to look
Does your ICV hum when they key is in the on position?

[Earl]

He said no the first time you asked lol

[GunMetalGrey]

Hey good call!
I have been helping two people with non running m5x/s5x and am getting the two mixed up!

[Earl]

^Just like he mixed up the grounds here?