Ok I'm in a jam. I bought a 1990 crx from a friend of mine with the d15b2 in it and when he had it, he decided to swap it to mpfi. All the parts are there, its just I cant figure out how to wire it all up. I have the massive stock harness that goes through the firewall from the ecu and fuse box and all the inside **** into the engine bay. And I have a crx si engine harness. The thing thats getting me confused is on the connector for the engine harness to the cabin harness on the drivers side theres like four extra wires. So does anybody have ecu pinouts so I can figure out what wires do what and what they should be connected to?

 

You need a dpfi to mpfi wiring conversion on the stock dx harness
here
http://effinmotorworks.com/Effin_MPFI_swap.htm

OR
you can send it to us, and we can do a like factory job for you
Thanks, Ryan

 

Yup, by all accounts, it's much easier to just modify the DX engine harness than it is to switch it out with a full Si engine harness. If you're comfortable with doing the wiring work, you should be able to get the electrical connectors you need either from an Si harness at a junkyard (or if you have one already, use that), OR I think you can still get those connectors through San Leandro Honda (slhondaparts.com) - but they cost around $5 each, if I remember right.

The Effin link that Ryan posted is the one we used on my '91 CRX DX, and it works perfectly. The car's been MPFI'd for almost two years now without a hitch or hiccup. If you're not comfortable with the wiring (I'm not, but I was lucky enough to have a wiring guru help me with the MPFI swap), get the harness adapter from RyWire. I've heard nothing but good things about his work and products.

Mike

 

Hey thanks a lot I really appreciate it. How much would it be for the adapters?