wiring 89 M20 into 87 chassis

[Funkmasta]

Alright, about to tackle this again...

We installed an 89 M20 into my cabrio, and tried to retain the 89 engine harness. This has proven to be a nightmare, so we are going to revert back to an 87 harness.

has anyone wired a late M20 with an early harness?

thanks in advance.

[James Crivellone]

any exact details? the only biggy is bringing C104 on the 87 into C101, I recommend taking an 88+ C101 connector and modding in that into the car.. I did this and its been problem free, and accepts any late model engine harness.

[Jand3rson]

I did this and its been problem free, and accepts any late model engine harness.

Yeah, it's a slut. :D

James is right, it does work just fine.

[Funkmasta]

any exact details? the only biggy is bringing C104 on the 87 into C101, I recommend taking an 88+ C101 connector and modding in that into the car.. I did this and its been problem free, and accepts any late model engine harness.

The cabrio is an 87. I parted out a 220k 89 325is that had been immaculately taken care of, and decided that the engine would be a good donor for the cabrio, since it was a great motor, and few people would be willing to buy a 200+ motor.

SO,

we tried to install the 89 M20 into the 87 cabrio, using the 89 engine harness.
No worky.

Would it be easier to swap back to an 87 harness? Or should I mod the plug?

At this point, obviously the easiest fastest fix would be best, but also I need something reliable.

Thanks!

Joe

[James Crivellone]

The cabrio is an 87. I parted out a 220k 89 325is that had been immaculately taken care of, and decided that the engine would be a good donor for the cabrio, since it was a great motor, and few people would be willing to buy a 200+ motor.

SO,

we tried to install the 89 M20 into the 87 cabrio, using the 89 engine harness.
No worky.

Would it be easier to swap back to an 87 harness? Or should I mod the plug?

At this point, obviously the easiest fastest fix would be best, but also I need something reliable.

Thanks!

Joe

Least hassle, 87 Harness...otherwise you gotta pull 3 wires deep inside the dash, to run them over to C101 (correctly anyway)

[Funkmasta]

Least hassle, 87 Harness...otherwise you gotta pull 3 wires deep inside the dash, to run them over to C101 (correctly anyway)

Cool, 87 harness it is.
Any difference in plugs on the motor? Do I have to mod the harness to work on the 89 block?

[James Crivellone]

Cool, 87 harness it is.
Any difference in plugs on the motor? Do I have to mod the harness to work on the 89 block?

88+ use a fuel rail harness for the injectors, instead of individual plugs like the 84 - 87 models..

Just rip that fuel rail harness off and use the individual plugs.