Ok, recently my father and I acquired a 91 318is that was in the progress of getting an m50 swap. everything is there and hooked up and it just needs a few things.
We are having some weird fueling issue however. We have no fuel pressure.
We have traced the wires from the bus into the fuse box and and back to the relay but when the car cranks the fuel pump does not prime. When we bridge the relay, power to the fuel pump is restored. Simple relay problem right? But, then we replaced the relay with another one that has the same part number we still get nothing. There are two wires left that we need to trace and I'm not quite sure where they lead to. One is a small gauge green and brown and the other is a small gauge red and white. I see on the wiring diagram that the green and brown wire leads to the ECM as the fuel pump relay wire.
The other one I'm not too sure about. Could it be possible that the green and brown wire is not pinned connected to the ECU and the relay is not getting signal?
Or, is that bastard red and white wire to blame? If anyone knows where that goes to or has any helpful insight feel free to contact me or post up.
Were in a bit of a hurry, the races are starting soon and we still need to get the car prepped for the track.
Also,
Ok, it seems like this guy had a mish mash of parts in this thing. Its an automatic e34 harness for the vanos m50tu (which we have on an engine stand), the 402 DME and a nv m50 from a 3series. I pulled all the wiring almost entirely out of the car and I've found a total of 5 unhooked and until yesterday, unidentified connectors.
We have them all figured out I think
2 knock sensors
1 vanos solenoid connector
1 cam position sensor (even it's already hooked up)
(after much searching) I found out the vanos harness and the non vanos ecu pinouts being different, along with the differences in signals in the the MAF, the cam position sensor, and the crank position sensor. Which I think might lead to our no spark no fuel condition. right?
The other possibility is an immobilizer wire. But I've heard thats for pre 88 cars. Ours is a 91, could this also be the problem?
Thanks
Dave
We are having some weird fueling issue however. We have no fuel pressure.
We have traced the wires from the bus into the fuse box and and back to the relay but when the car cranks the fuel pump does not prime. When we bridge the relay, power to the fuel pump is restored. Simple relay problem right? But, then we replaced the relay with another one that has the same part number we still get nothing. There are two wires left that we need to trace and I'm not quite sure where they lead to. One is a small gauge green and brown and the other is a small gauge red and white. I see on the wiring diagram that the green and brown wire leads to the ECM as the fuel pump relay wire.
The other one I'm not too sure about. Could it be possible that the green and brown wire is not pinned connected to the ECU and the relay is not getting signal?
Or, is that bastard red and white wire to blame? If anyone knows where that goes to or has any helpful insight feel free to contact me or post up.
Were in a bit of a hurry, the races are starting soon and we still need to get the car prepped for the track.
Also,
Ok, it seems like this guy had a mish mash of parts in this thing. Its an automatic e34 harness for the vanos m50tu (which we have on an engine stand), the 402 DME and a nv m50 from a 3series. I pulled all the wiring almost entirely out of the car and I've found a total of 5 unhooked and until yesterday, unidentified connectors.
We have them all figured out I think
2 knock sensors
1 vanos solenoid connector
1 cam position sensor (even it's already hooked up)
(after much searching) I found out the vanos harness and the non vanos ecu pinouts being different, along with the differences in signals in the the MAF, the cam position sensor, and the crank position sensor. Which I think might lead to our no spark no fuel condition. right?
The other possibility is an immobilizer wire. But I've heard thats for pre 88 cars. Ours is a 91, could this also be the problem?
Thanks
Dave
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