84 318i m10 in an 82 e21 320i

[Gabbahey74]

So I just dropped an m10 from an 84 e30 318i into my 82 e21 320i. I need help connecting the e30 harness to the e21 fuse box, and any other details needed with the "swap". Any help is greatly appreciated. Thanks!

[KI4UJO]

If you can PM me your email, I can get you the 1984 electrical troubleshooting manual for a 318/325, it should have all of the diagrams that you are looking for, at least on the e30 side.

[Gabbahey74]

Bicarvallo@hotmail.com thanks.

[TobyB]

umm, that's not going to work. You'll need to use the E21 engine harness and intake, or the E30 body
harness and computer and fuel pump and stuff.

The E21 is CIS- essentially, mechanical fuel injection.
The E30 is L-Jet EFI.

The two just won't mate... don't you remember that song by Loverboy?

http://www.youtube.com/watch?v=RztfjHdM-pg

[Gabbahey74]

I have the e30 motor all complete in the e21. Intake,computer, head, fuel, ignition, everything. so my plan is to wire the e30 harness to the e21 fuse box. I would be taking apart a great motor if I changed out the fuel and computer, etc. back to the e21.

[TobyB]

Ah- then you want the E30 fuse box and body harness as well. It'll be SOOOOOOO much
easier in the long run.

t

[Gabbahey74]

Yeah. The e30 that I got the m10 from was my friends that he put an m20 in and kept the box and body harness.

So I need to rip the e21 body harness and fuse box out?

Install the e30 box and harness?

But will it all hook up to my dash, etc.?

[TobyB]

Well, you'll have to splice somewhere, I guess. If you get the E30 ETM,
and the E21 factory manual, you can decode the
engine harness connector and do your splicing there.

The E21 uses a mechanical speedo, so that will work...

After that, it gets tricky, because the E30 integrates the ignition into the ECU, and
the E21 kept it separate. I suppose you could ditch the E21 ignition and run the E30's,
because the E21 curves are probably different for the CIS.

The EFI only wants about a dozen signals from the body- mostly power, and it returns
just a few (CEL, Alt, etc).

This is going to take some research... and I don't remember enough specifics
from the E21/early E30.

t

[KI4UJO]

http://wedophones.com/BMWManualsLead.htm

The etm for the 318 is available here. My email account wouldn't let me send it.