z31 maf swap and FCM questions.

[username]

i am swapping in a 84 z31 eccs in to my 81 zxt.

i am using a 83 harness.

 

questions, the 81 does not have a fuel control modulator, the 83 harness does.

i do not have a FCM.

how do i by pass the FCM?

should i just run a 12v switched source to the relay lead?

at that point i may as well run new 10ga to teh pump and use a newer,larger relay.

 

 

thoughts please. i am putting in the harness today. actually i did and noticed the fcm not there.lol.

 

thanks

tony

[Kash]

You do not need the FCM, either of your two options should work just fine. Isn't there a fuel pump relay on the '83 harness...don't remember, its been a few years since I did the swap.

[username]

got it figured out i think. worst case, new wiring all round.

[KnightoftheRound]

The swap seems to call for removing the dropping resistor pack for the injectors. My car is an 82' with an 81' L28ET swap, and it would not run once warmed up until I decided to try it with the resistor pack plugged in.

 

Runs perfect now.

 

EDIT: I see your using and 83 harness, what I said was just an FYI, so good luck! Hope your swap goes smoother than mine.

[jeffp]

I don't recommend the 84 box, but rather the 88-89 ox for your conversion. The 84 box doesn't have the features the newer unit does, and the 88-89 box uses the same connectors as the turbo harness.