S50 Crank no start

[Ian Bowers]

Hey guys, I've been searching (and will continue to do so) and I really didn't want to ask, but --

02/87 325e
03/95 S50B30 US
94 325i Manual Vanos Harness
AKG wiring adapter

Both grounds on the engine arms are hooked up
distribution block is correct
Fuel rail is grounded
engine was timed with the correct factory tools

The car cranks, but the fuel pump isn't turning on and I don't have spark.
CPS checks out according to bentley
ICV doesn't hum
I can jumper the fuel pump relay and it works, but still doesn't start. I just spliced pin 7(body) to pin 21(harness) because the AKG adapter doesn't have it.

few questions: I plugged everything up, but all of the information I found said that the IAT under the manifold used a 2-hole plug with 1-wire to it, I thought that would go to the E30 temp sensor I installed in the head?

am I looking at this harness adapter just not working for my car, or am I missing something simple?

[meanEG]

i am having the same issues, so free bump instead of starting a new thread. I am running a obd1 m52

[36brua]

below is a copy paste from a post I saved i don't have the thrd but probably from here.
I've read the AKG may have some mystery to it.


>>Okay, the fuel pump problem is easy. AKG have got the pins wrong on their chart.
They have got E30 pin 6 going to E36 pin 13. You should have E30 pin 13 going to E36 pin 13.
E36 pin 13 is a 12v signal coming from the E36 fuel pump relay. This passes through pin 13, and needs to go to E30 fuse 11, and then off down to the pump
.
AKG have got a 12v signal coming from the E36 fuel pump relay and connecting to E30 pin 6. This is a 12v signal from fuse 9 that would normally drive the O2 sensor relay. They basically have 12v connecting to 12v coming the other way.




I also noticed they don't have any connection for the Rev counter. You need to have E30 pin 9 connected to E36 pin 20.

If you want the Unloader relay circuit to operate correctly, you also need to connect E30 pin 15 to E36 pin 15.

[Neil1138]

Do you have +12V at terminal block?

Do you have +12V at main relay?

I was having similar issues, turned out to be fusible link.

[Mr Mpower]

Both grounds on the engine arms are hooked up??
my e36 only have one in one arm and mi e30 with the old engine and with the new engine ..the same..only one ground in one arm.
how you check de CPS?.

[Ian Bowers]

Do you have +12V at terminal block?

Do you have +12V at main relay?

I was having similar issues, turned out to be fusible link.

Yes to +12v at terminal/main relay, I checked the fusible link and it was blown, so I fixed that and I now have power to 7/21, but still no fuel pump when cranking.

Both grounds on the engine arms are hooked up??
my e36 only have one in one arm and mi e30 with the old engine and with the new engine ..the same..only one ground in one arm.
how you check de CPS?.

I added additional grounds. I checked the CPS with a multimeter, as well as putting it on an M50 E36 to cross-check.

I ended up wiring the engine harness to a c101 to the body, still working on it but I ditched the AKG adapter.

[Ian Bowers]

Anyone mind checking this over for me?
02/87 11/93 325i harness
C101 | X20
1 ------25
2
4 -----12
5------23
6------22
7------21
10
11------19
12------8
13-------13
8-------18

[Ian Bowers]

So I've spent a bunch of hours with a multimeter and a test light making my back hurt, but...

Main relay has 12v
Dist block has 12v
fuel pump relay has 12v
02 relay has 12v
ICV hums
car cranks wonderfully
all coils have 12v

Still doesn't fire, but I am going to throw some more injectors/another CPS at it tomorrow and clean up all of the grounds again.

[Ian Bowers]

S50 Crank no start

So I tried new injectors, no bueno. Tried another used junkyard cps, no change. I clipped the wire from pin 66 on the DME, again--no change. It will start on Starting fluid, but the car refuses to turn the pump on when cranking, and when I jump it, the injectors don't flow anything.

I hate to throw money at it, but I feel like all signs seem to point to my CPS, or some sort of ews I'm missing. Any comments?


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[gkurey]

Do you get a CEL when you key up power on?

[gkurey]

I had an issue sorta like this, I thought I had good power coming from the big green ignition wire, cant remember the pin; multimeter showed 12v, but it actually wasn't passing current. I used a test light to determine its signal was actually inadequate. You might look into that.

[Ian Bowers]

Do you get a CEL when you key up power on?

Early model, I don't have one on the cluster.

I had an issue sorta like this, I thought I had good power coming from the big green ignition wire, cant remember the pin; multimeter showed 12v, but it actually wasn't passing current. I used a test light to determine its signal was actually inadequate. You might look into that.

Test light shows it's all good. . I think it's an EWS feature that shouldn't be existent. It started momentarily on starting fluid last night, and I bench tested all of the injectors and they check out.

[golde30]

Fuel lines on backwards? What ECU are you running?

[Ian Bowers]

Fuel lines on backwards? What ECU are you running?

Nah, they're correct. 413 Silver label with a conforti EWS delete chip. I tested the DME in a 95 325i and it fired up immediately. Quick question:

If I ground pin #66 (found someone say that was their solution) from the DME and the ICV "buzzes" instead of humming, making me think my harness has the immob over pin 81, but the ETM says 66... any ideas?

Just a small update. So, the main relay was bad. It wasnt the normal bad where it doesnt work but the bad where it backfeeds voltage through the negative side. (I have never seen this in all my years of electical work)

To add to the problem. That ground was tied in with the wire that goes to pin 66 (the ews wire although it was black with silver) and fed it voltage causing the car not to start even though it was a non ews harness. The chip must still have ews in it. (it is a 413 red dme)

lol, crazy wiring issues.

this post confuses the shit out of me.

[e30rapidic]

I put an S50 in my 10/86 build date 325i, my pinouts are the same as yours. Are you sure the connectors are plugged in the right places? Also one of the heavy black wires is actually a power wire, you have to pull some sheathing back to see the red.

I'll see if I can dig out my wiring connectors colors to compare