1989 325i engine going into 86 325e

[brickvolador]

ok guys i finally did my engine swap! the car is running perfect.. well almost lol i need help to make the rpm tach work, the 3 cables in the glovebox. help please!

[MR 325]

I can't even count how many times I tell people the answer to this problem...

USE AN 87 i/ic/is ENGINE HARNESS. Problem solved, no spliced wires, everything plugs in like it came that way from the factory.

[E30Gus]

Yeah, even I figured that shit out and I'm high all the time

[brickvolador]

I can't even count how many times I tell people the answer to this problem...

USE AN 87 i/ic/is ENGINE HARNESS. Problem solved, no spliced wires, everything plugs in like it came that way from the factory.

yeah man i know i just dont want to get the 89 harness out, is there any way to connect the cables without having to change the harness?. Greetings

Thanks.

[E30Gus]

Dude, down load the wiring schematics for the 2 years involved and look for the tach wire (one wire) that has to be spliced into the C101 I believe. That is pretty much it. Run that wire and you should be good to go. Best way I found was to print that crap out and grab a highlighter....and a beer.

[cavi]

does anyone have a 87 i harness they might want to sell?

[brickvolador]

Dude, down load the wiring schematics for the 2 years involved and look for the tach wire (one wire) that has to be spliced into the C101 I believe. That is pretty much it. Run that wire and you should be good to go. Best way I found was to print that crap out and grab a highlighter....and a beer.

LoL THANKS man !! im totally agree about the beer! umm so i just run the rpm tach cable to the c101 connector, do you know what number?? :) i honestly cant read those wiring schematics man!!! too much for my brain i just see lines and more lines! LOL

[brickvolador]

Update pics

[E30Gus]

It is one of those 3 wires Black, yellow, or green.
I'll check when I get home after work. I still have all that stuff in a folder.
One of them is the tach and one is the fuel economy gauge which I never ended up hooking up.

[jlevie]

The easiest solution to this is to scavenge the C104 connector from the old harness and graft it into the later harness. The wiring diagrams available at http://wedophones.com/BMWManualsLead.htm will be helpful.

[ÜberslowETA]

Google "strictly eta". Thats Fred Kim's site. He details the steps needed to resolve your issue under modifications, in the 2.8I article.

[brickvolador]

Google "strictly eta". Thats Fred Kim's site. He details the steps needed to resolve your issue under modifications, in the 2.8I article.

thanks man!! i just did it lol its working now but i have some questions my rpm tach is like lazy at idle it reads like 200 rpm it should be 900 rpm and when i rev the car the rev limiter is at 6000 ummmm ???? any ideas

[brickvolador]

what can it be>??? http://www.youtube.com/watch?v=AwmponuLxFw

[brickvolador]

Please help again!! Thanks!! :)

[ÜberslowETA]

Did you change your cluster as a whole or just the tach? If just the tach, did you change your coding plug?