Are you interested in doing a 24v swap? Read this!

[iamsam]

OP, the image in the first post is broken.

[tonytony]

i have done it to my own swap, I figured it out when i bought a e34 pump and noticed that the parts were close, if not, identical for both pumps. So i saved my self the unnecessary hassle and just switched over the oil pick up and sold the pump from the e34. I've have my swap for 4 years now and my motor hasn't siezed up yet so it's safe to say it works

here are the part numbers:
e36 11411740154
e34 11411740155

[JRKOUPE]

oops

[JRKOUPE]

pump

just do add: You dont need to replace the 36 oil pump with the e34 oil pump if you're doing an m50 swap, the pumps are the same part, you just need the oil pickup tube. It makes life a whole lot easier and saves you money

are you EXCLUDING S50s? I had NEVER heard this....can we get confirmation on this?....

[JGood]

this only pertains to 89+ production years where the abs power runs through the c101 rather than the body harness.

Good point. This is why it's so important to trace out wires based on model year. I burnt up an 89 m20 harness when swapping it into an 87 chassis because of this exact wire. +12v and ground don't mix very well...

[Dominic49]

To the DIYers:
If you are going to mod your own engine harness, it would be wise to map your x20 pins with the wire colours for each, and trace each wire to it's termination.
Put this info on a table, because depending on the harness you use, the wire colours may be different to the ETM.

Learn how to read the ETM. Not all wires at the C101 plug on the E30 are going to be the same colour for their entire length.

It is best that you know the function of each wire instead of blindly using other peoples posted x20/c101 tables.
Learn how the stuff works so that you can diagnose and fix potential problems/errors.

I would also recommend that you pull back the boot of each harness plug and record the wire colours and number of used terminals. It helps narrow the search once most but not all of the harness has been connected to the engine sensors, ancillaries, etc.


Regarding anti lock brakes:
The E34/36 harnesses have no power provision for the ABS. This requires you to splice in switched 12v to power the ABS pump. Tap into the thick wire coming off T87 of the E34/6 Main relay.

m

this only pertains to 89+ production years where the abs power runs through the c101 rather than the body harness.

[tonytony]

just do add: You dont need to replace the 36 oil pump with the e34 oil pump if you're doing an m50 swap, the pumps are the same part, you just need the oil pickup tube. It makes life a whole lot easier and saves you money

[7pilot]

To the DIYers:
If you are going to mod your own engine harness, it would be wise to map your x20 pins with the wire colours for each, and trace each wire to it's termination.
Put this info on a table, because depending on the harness you use, the wire colours may be different to the ETM.

Learn how to read the ETM. Not all wires at the C101 plug on the E30 are going to be the same colour for their entire length.

It is best that you know the function of each wire instead of blindly using other peoples posted x20/c101 tables.
Learn how the stuff works so that you can diagnose and fix potential problems/errors.

I would also recommend that you pull back the boot of each harness plug and record the wire colours and number of used terminals. It helps narrow the search once most but not all of the harness has been connected to the engine sensors, ancillaries, etc.


Regarding anti lock brakes:
The E34/36 harnesses have no power provision for the ABS. This requires you to splice in switched 12v to power the ABS pump. Tap into the thick wire coming off T87 of the E34/6 Main relay.

m

[Spaz]

I'm still trying to find out who admin's the wiki page so i can help clean it up.

If you know who does let me know so we can get it all sorted out.

-Cam

[JGood]

reserved post

[JGood]

Alright, I'll start coming up with some stuff.

[z31maniac]

I think all the basics/combo's/etc procedures could be covered, tips/tricks/hints and such. The DOHC Wiki page is getting worse and worse with the spam bots. Stuff like this

OIL PRESSURE SENSOR -- BRN/GRN OR BRN/GRY
FRONT COOLANT TEMPERATURE SENSOR -- (ECU) BRN/RED BRN
REAR COOLANT TEMPERATURE SENSOR -- (GAUGE SENSOR) BRN/YEL BRN/VIO
CRANK POSITION SENSOR -- YEL
CAM POSITION SENSOR -- YEL RED/WHT BRN/ORG
VANOS SOLENOID -- RED/WHT GRN/BLU
KNOCK SENSOR, -- 1-3 BLK NCA DME PIN 70
KNOCK SENSOR, -- 4-6 BLK NCA DME PIN 69
THROTTLE POSITION SENSOR -- (TPS) BRN BRN/BLK RED/YEL
INTAKE AIR TEMPERATURE -- (IAT) SENSOR BRN GRY
IDLE CONTROL VALVE -- (ICV) WHT/YEL RED/WHT WHT/GRN
EVAPORATIVE EMISSIONS VALVE -- BRN RED/WHT

[JGood]

Maybe we could turn this thread in a concise no-BS version of the stickied thread in this section by adding all the relevant info with pictures and such?

I think it's too much info for a message board thread. The DOHC wiki is perfect for fiorst timers to read through, although it could use expanded upon.

There are just way too many variables and what-if's for an all-inclusive message board style write-up. Yeah, you can get the basics out there, but you'll have straggling questions leading a 77 page clusterfuck thread of discussions.

[z31maniac]

Maybe we could turn this thread in a concise no-BS version of the stickied thread in this section by adding all the relevant info with pictures and such?

[apexhead]

I agree.

Read the damn wiring manuals people! You might even learn something along the way.