My E30 M50 Swap with pictures

[nholm325e]

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[nholm325e]

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[nholm325e]

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[nholm325e]

Just ordered the 88+ coolant expansion tank and a new interior door handle housing(old one shattered)

[nholm325e]

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[nholm325e]

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[nholm325e]

So i been busy with college and i finally got the exhaust fabricated in my garage. Came out fairly well for never being on a lift thanks to my dad. I will hopefully be able to post some pics soon. After fixing a vacumm leak near the IAC, i actually got the motor running but i have an obvious idling problem.

The idle seems to hunt around then the idle will start racing high. Ran it for 30 seconds (felt like 10 mins!) but still has the same symptoms.

Now that im outta school i got time to look into the problem more...

[matt]

It's good to know m50 and s50 wiring harnesses are the same. (at least according to realoem.)

That means they're the same.

[87-325ic]

It's good to know m50 and s50 wiring harnesses are the same. (at least according to realoem.)

[etxxz]

So i turned it over for the first time ever in the E30 and she RUNS!!! (i shut if off after about 1.5 seconds, very loud without exhaust). Very surprised i got most of the wiring correct on the first try (even though i know the wiring is not 100% right or complete, still needs some tweaking im sure of that). Now im off to go get the custom 2.5 inch exhaust made by my buddy. I still need to get is an eletric fan though.

i noticed that there was at least a few wires changed color from one side of the c101 connector to the other side of the connctor.

Function E30 325e Build Date 11/86 - E36 92 325is n/v

Oil Pressure Blue/brown Brown/white
Fuel Pump Violet/Red Green/violet
Starter Black/yellow Black/yellow
Alternator charging Blue Blue
Temp Guage Brown/violet Brown/violet
02 Heater Sen. Relay Green/yellow Green/white
Oil Level Sensor Static Blue/yellow White/yellow
Oil Level Sensor Dynamic Blue Blue/yellow
Diagnostic Connector White/black White/green
Ignition Switch Green Green

Ill take get back with some more pics after the exhaust is made

great stinking information. is this following the AKG c101 chart? i wonder how similar this is with the S52 i'm droping in very soon.. thank keep us updated!

[MikeD]

A is the O2 sensor wire, or what's left of it. Check out the thread from Mr. Swiss for a complete explanation.

[Mr.SWISS]

B is your reverse light switch. I posted a wiring schem for a 92 non vanos in another thread that tells you what wire is what for the O2.

Way to go! It feels good when it runs.
O2 thread

http://www.r3vlimited.com/board/showthread.php?t=94469

[nholm325e]

So i turned it over for the first time ever in the E30 and she RUNS!!! (i shut if off after about 1.5 seconds, very loud without exhaust). Very surprised i got most of the wiring correct on the first try (even though i know the wiring is not 100% right or complete, still needs some tweaking im sure of that). Now im off to go get the custom 2.5 inch exhaust made by my buddy. I still need to get is an eletric fan though.

i noticed that there was at least a few wires changed color from one side of the c101 connector to the other side of the connctor.

Function E30 325e Build Date 11/86 - E36 92 325is n/v

Oil Pressure Blue/brown Brown/white
Fuel Pump Violet/Red Green/violet
Starter Black/yellow Black/yellow
Alternator charging Blue Blue
Temp Guage Brown/violet Brown/violet
02 Heater Sen. Relay Green/yellow Green/white
Oil Level Sensor Static Blue/yellow White/yellow
Oil Level Sensor Dynamic Blue Blue/yellow
Diagnostic Connector White/black White/green
Ignition Switch Green Green

Ill take get back with some more pics after the exhaust is made

[Mr.SWISS]

I hope yours works right, I fucked with that thing for 3 days and I still get a O2 sensor code and check engine light. GL

[FredK]

I'm pretty sure C goes to the charcoal canister check valve.