Looking for some help/ diagrams with E30-S50 swapped issue

[afterthought]

Hello need a bit of advice or direction regarding a problem I'm having.

I have a swapped car that I purchased, swap was very professional looking but the car will not fire on #4 cylinder. Only has a few miles on the conversion so I'm looking for loose plugs or anything I can think of but the nature of the problem leads me to suspect a loose ground or something similar. Again there is no rough running on any of the other cylinders, it simply only fires on 1,2,3,5 and 6.

First I did a compresion test, all was good.

Second I swapped out the plugs that came in it for NGK plugs.

Then let the car idle and can hear that the injector/solenoid for the #4 cylinder is not clicking like the rest.
*edit* For good measure I also tried swapping 3/4 injectors, and the misfire stayed with 4. Did the same with coil packs, and same result.

Looking for any diagrams or info about how to test the power to the injector and grounds as well.

Shot of the ECU I'm running

[M3PO]

Do a search for "ETM". That's what the wiring diagrams are called around these parts.

[afterthought]

Do a search for "ETM". That's what the wiring diagrams are called around these parts.

Ok thanks much for the help! I didn't know that :)

So, dug further into the issue as I had some time today.

I tested power to injectors with IGN on. all good. grounds all good too.
All the grounds tie in with each other so If I had an issue there with the main ground I would have more than just one dead cylinder. Seems to me like the ECU turns the ground on and off to fire each cylinder.

Tested with the car running and I'm not getting a signal to the injector to fire #4 . This is very tough to test as a multi meter cant see the quick pulse.. Don't know what i'd need to test that. (oscilloscope?)

Traced back the wire from #4, tested continuity on all ecu to injector signal wires and all were good.

So for some reason my ECU is sending a signal to all but #4 cylinder to pulse the injector.

So here comes the question. I searched and found different answers. The numbers on my block confirm that it is an S50, but the ECU I have ("Red label"?) 0 261 200 413 , is that correct for an S50? Looks like its from a 318

[arch4ngel]

Sounds like either bad wiring or bad ecu.
Have you tried the stomp test to see if there any codes?

[Coupelx]

A noid light is what you are looking for to check to see if the ecu is firing an injector.

413 is for an m50 bit it should run an s50 though performance will be lacking.

[afterthought]

Sounds like either bad wiring or bad ecu.
Have you tried the stomp test to see if there any codes?

Did not do the stomp test.
I'm almost certain the ECU is bad. Tested the wiring multiple times and carefully cleaned the contacts. It is certainly not telling the injector to open.

A noid light is what you are looking for to check to see if the ecu is firing an injector.

413 is for an m50 bit it should run an s50 though performance will be lacking.

Noid light doesn't look too expensive. be a good tool to have around.

I wonder why the shop that did the swap used a 413, as wondering if it had something to do with the swap. I don't see a reason why not to use a "506" unless I'm missing something. Honestly might do standalone some time in the near future.

[kronus]

413 will run an S50 totally fine, that's BS.

you might have burned an injector driver in the ECU though.

[afterthought]

413 will run an S50 totally fine, that's BS.

you might have burned an injector driver in the ECU though.

Its likely, I also popped open the ecu very carefully not to touch anything and could not see anything that looked burned, any bad solders, or anything obvious that stood out.

What I'm going to do for now is source another 413 ECU to try and see if it's the cause of my issue, I'm fairly certain it will fix the problem (although I've been certain before and wrong)

[M3PO]

They probably used a 413 DME because it doesn't have EWS (immobilizer). It will run the S50 just fine, I ran my S50 on one for quite a while. In fact I still do, but now I have a chip programmed for an S50 and not an M50. Honestly, my "butt dyno" couldn't tell the difference.

[afterthought]

They probably used a 413 DME because it doesn't have EWS (immobilizer). It will run the S50 just fine, I ran my S50 on one for quite a while. In fact I still do, but now I have a chip programmed for an S50 and not an M50. Honestly, my "butt dyno" couldn't tell the difference.

Thanks again for the reply. Im totally new to this (but I will say been enjoying working on BMW so far)

I did find a 413 DME ecu for $75 and it should be here in 2 days so with any luck I'll be on the road with it thursday.

[kronus]

that's also wrong, there are 413 ECUs with EWS. Red label ECUs don't have EWS, silver label ones do.

one thing that's weird and different is that you have a Programa ECU which is a Bosch reman. hopefully the good original one works out!

[M3PO]

Yes, make sure that the 413 is a RED label DME. Some people say that there are early 413 Silver DMEs with no EWS but if this is true they are unicorns so it's better to stay away from the silver 413 DMEs.

[kronus]

EWS is an important issue to discuss carefully, partially because a whole lot of info out there is wrong or not applicable because it's for E36's, not E30s.

Generally, the E30 EWS issue seems to be overblown. I have three 413 ECUs, two of which are silver label and one is red label. I have an S50 TRM chip, a M50 EWS delete SSSquid chip, and two stock M50 chips that came in the silver label 413s.

The car starts with all three ECUs and all 4 chips. I've done no harness modification (cutting green #66 wire, etc) and it's fine.