I have a 91 civic lx and i am about to install a d16y8 into it. I am converting it to obdI, i have the ecu jumper harness and a p28 ecu. I know i need a wiring harness from a 88-91 si. my question is can i use a wiring harness from a 91 prelude si? Thanks.

 

wrong, you need to use your LX engine harness, convert it to match the d16y8. You can't simply throw another engine harness in your car. Sorry.

Rywire has options for ya, checkout the website.

 

just use ur stock harness, and cut it and add wires when u need to. thats all i did i have a 89 hatchback with a d16y7 and a full turbo setup. runs perfect.

 

but the lx harness only uses 2 injectors

 

That's where a DPFI to MPFI conversion comes in.
Check it out: (same thing as y7 basically)
http://rywire.com/store/8891-c....html