Finished swap..No spark, No fuel, No start

[highoutput]

OK...I give up and I'm asking for help. I just basicly finished swaping my M50 V into my '84 318i.
Today I tried to start it for the first time....and as the title states, I have no spark and no fuel from the injectors. I'm not very confident in my wiring harness splicing, but I've checked it multiple times.
Anyway, I've searched and tried a few things, so Ill just list what I know and what I've tried, and hopefully someone has some advice.

The motor is supposedly from an 93 325is , red lable ecu...my car is an "84 318i
The engine turns over, and the fuel pump is on (pressure at the rail) but no spark, and nothing from the injectors.
I've got power to the ECU, but im not sure if its where it needs to be.
I tried switching the crank and cam sensors
Checked power across the connectors, good. Checked fuses.
The three relays that are part of the engine harness dont have any power...I'll post a pic of them below. I'm fairly certain they all need to power up, but they have nothing on any of the terminals. It looks to me like they get power from the ECU??
I DO have one wire to all the ign coils with a constant 12V.
I've got 2 connectors on the harness that arnt plugged in. Both are 2 pin. One is off the MAF sensor harness, and the other is off and near the O2 sensor harness. Not sure if they matter anymore??

I'm not sure whats useful there and whats not, but I'm just trying to give as much info as I can. I'll post up my wiring harness connections below. I used the info from an AKG motorsports post. However, its really meant for the 325, and i have the 318. So some of it was a little confusing, but I think its right.
I'm using the connector from the M10, so I just kept the old connector, and took the wires I needed to use from the new one. But its still attached.
20 pin c101
pin 1............25
pin 4.............empty my only empty wire on the old connector
pin 6............13
pin 7............13 put them both to this one, seemed to work?
pin 8............18
pin 10...........21 - big green ecu power
pin 16...........23
pin 17...........19
I obviously left out the slots with no pins or wires in them.



Thanks for any help

[Matt-B]

E30 FE4R, he is near you, and helped me

[trackjunkie21]

red label? you're supposed to have a white label ecu.... and how do you have fuel at the rail if your fuel pump relay isn't getting power? nor is the main relay.

[highoutput]

I have pressure cause of the way I wired up the fuel pump ,I believe. Its powerd from the same wire as the O2.
Why am I supposed to have a white label ECU?, Just wondering what your basing that on, cause I'd like to double check it.

[YeOldeBuggy]

I can tell you, from my obd 1 swapped m52, that the plug coming from the maf harness is your air intake temp sensor plug, (it is threaded into the bottom of your intake mani towards the firewall). Other than that, not enough info, tell us what you have the wires ran to (on the x20 to c101 harness)

Thad.

[highoutput]

OK, thanks....i looked at a wiring diagram and saw that one of those connectors was for the intake temp. But i figured it was part of the original air intake box, and i didnt have it anymore. I'll look for it tonight. Still, I doubt thats keeping if from starting.

I tried to list out my wiring connection in my OP, but ill copy them here and add some info to clear it up......my chart sucks, i know.

C101-----------X20
-pin 1............25 (Blue) alternator wire

-pin 4.............empty my only empty wire on the old connector, I think its for the cluster temp gauge....so its just not hooked up yet(brown and violet)

-pin 6............13 O2 sensor relay (Green+yellow)

-pin 7............13 Fuel pump (Red+violet) Put them both to this one, cause they both run off #13 on the C101.....seemed to work

-pin 8............18 Starter (black +yellow)

-pin 10...........21 - big (green) ecu power

-pin 16...........23 Oil pressure (Brown+green) connected to (brown and purple) i think

-pin 17...........19 service reset (white+blue)


It seems strange to me that the main power relay (which is part of the engine harness, and pictured) gets its power switching wire AND its power supply wire both from the ECU power. Is that right?

While Im spilling out things I dont understand......... The wiring "crossover from X20 to C101" charts i used lists pin#9(X20) connected to pin#20(C101). Pin 20 on the C101 is for "engine speed" , but pin 9 on the X20 has nothing there- no wire. So what the hell are you supposed to connect it to?

[highoutput]

red label? you're supposed to have a white label ecu.... and how do you have fuel at the rail if your fuel pump relay isn't getting power? nor is the main relay.

I was wrong, its actually from a 93 325is , if that makes any difference. I changed it in the original post

[YeOldeBuggy]

http://www.r3vlimited.com/board/showthread.php?t=163088

This was the resource I used to double check my m52 swapped 325is, it should help some.

Thad.

[highoutput]

Thanks again, I'll check it out.
Im looking at a wiring diagram now, and it says the main power relay should be hot all the time, and its not. So I obviously did something wrong, I'll have to look again when I get home.
When i was looking at the actual wires, it looked to me like the ecu got power from the green wire(pin#21), and the main power relay got power from the DME.
But looking at the diagram, thats wrong. I'll give it another shot this afternoon.

[blackhawkimpact]

Your first mistake is that your using the AKG wiring chart. That chart is not very accurate plus that's from/for a 325 I believe, yours is a 318i, wiring is way different if I recall.

[highoutput]

Yeah , your right, but it was the only "chart" made for this swap I could find. Most of the wiring for the 325 seems to be the same in terms of the X20 connector.....at least for the '84 and '85s.
Ive had some time to take a better look at some wiring diagrams today, so hopfully I'll figure something out tonight.

I'm really curious about the fuel pump relay wiring though. I know someone out there has swaped out a 318, and had a pic of how they did the wiring, or an explanation.

[325islovE]

make a pin out for your x20 and c101 with wire colors, go here> http://www.wedophones.com/BMWManualsLead.htm , find your car and engine and get to work...

I bought a wire harness adaptor and i still had to do my home work on the wiring because it was done wrong, would have just been 10x easier to do it this way in the first place.

[YeOldeBuggy]

I was wrong on the 2 pin connector that shares the maf harness, it plugs into some kind of emissions sensor that hooks onto the vacuum port of my throttle body. Good luck.

Thad.

[highoutput]

Thanks!

make a pin out for your x20 and c101 with wire colors, go here> http://www.wedophones.com/BMWManualsLead.htm , find your car and engine and get to work...

I bought a wire harness adaptor and i still had to do my home work on the wiring because it was done wrong, would have just been 10x easier to do it this way in the first place.

And yeah, beat you to it. I already printed them all out;) but thanks. I'll come up with something!

[blackhawkimpact]

make a pin out for your x20 and c101 with wire colors, go here> http://www.wedophones.com/BMWManualsLead.htm , find your car and engine and get to work...

I bought a wire harness adaptor and i still had to do my home work on the wiring because it was done wrong, would have just been 10x easier to do it this way in the first place.

+1 This

I was wrong on the 2 pin connector that shares the maf harness, it plugs into some kind of emissions sensor that hooks onto the vacuum port of my throttle body. Good luck.

Thad.

The 2 pin connector that's with the MAF connector is for the charcoal canister I believe.