E30 S50 no start - no spark/no fuel

[dewme5]

Have you tried a different computer?

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[e30austin]

Bumping this up again one last time before I give up...

I've changed the engine harness with one off another known good '93 325is manual car. I built an adapter for it. It's all still doing exactly the same thing it was before I changed the engine harness.

[Ekisto]

Well, that's a no go. Fuck....

10000 kilometers of distance and we have exact the same problem!

[e30austin]

Well, that's a no go. Fuck....

[Ekisto]

Had a friend come over and help diagnose this. Here's what we found:

-all C101 wiring is correct and getting power
-all grounds/hot leads in correct places and doing what they are supposed to
-relays not grounding out (ie, the load is not unloading, and ground wires at the relays are getting power)
-DME not getting power at pin 15 of DME connector

Which leads me to the ground at the front of the cylinder head (the main DME ground), that comes out of the fuel injector harness. I remembered there was a resistor, so I removed the cover off, and sure as shit, that was completely disintegrated. Sourcing a new resistor and perhaps will have this fixed tomorrow...if that is, in fact, the issue. If not, I am replacing this engine harness.

FWIW, I called the dealer. The resistor is a EU only part, costs $25 retail (no discount), and takes 3-10 business weeks to get here from the dealer...or can be found on ebay for 1/3 the price and here in 3 days. LOL

Tell us if it works! Can you give me the part number?

[Poeman446]

Nice work. Hopefully that fixes it!

[e30austin]

Had a friend come over and help diagnose this. Here's what we found:

-all C101 wiring is correct and getting power
-all grounds/hot leads in correct places and doing what they are supposed to
-relays not grounding out (ie, the load is not unloading, and ground wires at the relays are getting power)
-DME not getting power at pin 15 of DME connector

Which leads me to the ground at the front of the cylinder head (the main DME ground), that comes out of the fuel injector harness. I remembered there was a resistor, so I removed the cover off, and sure as shit, that was completely disintegrated. Sourcing a new resistor and perhaps will have this fixed tomorrow...if that is, in fact, the issue. If not, I am replacing this engine harness.

FWIW, I called the dealer. The resistor is a EU only part, costs $25 retail (no discount), and takes 3-10 business weeks to get here from the dealer...or can be found on ebay for 1/3 the price and here in 3 days. LOL

[Poeman446]

I had the same problem for a while, and I used an E36 power block. I realized that the wire to power my ECU fuel and other relays was not connected. Check to see if you have power at the relays.

[Ekisto]

Did it start? im in the same place as you. Everything seems to be conected correctly.

[delamaize]

Time to rip and tear out that stupid alarm, and kill it with fire.

[Slovik]

Maybe something simple like a main relay?

[e30austin]

Yup, done all this. Swapped DME and various relays from my car to no avail.

The car has some bullshit alarm system in it. The unloader relays are all turning on, but I wonder if that alarm is doing something funny and causing it not to start (since it taps into the ignition switch...)

[Nick_S]

My CPS tested well within spec but the car wouldn't start. Replaced it with a brand new one and it fired right up....but you're saying the sensors are all new so I doubt this would be your problem. Tried a different DME? Double check your grounds?

[justin_l_]

Power and grounds good? Cut back the covering to double check?

[e30austin]

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