I have a 1991 crx base model with a DOHC ZC swap. I have searched and searched for all the info I can find to re-wire it. I read that to re-wire it I have to get the stock DPFI harness and swap it to MPFI. Is there a reason I couldn't get a HF or Si engine harness? I found someone with a wrecked 91 crx si for a good price and I'm hoping to use it as a parts car because I need more than just an engine harness.. but for now the wiring is my main concern. it runs but it doesn't run all that well..

 

You do have to modify the harness that came with the vehicle to make it MPFI. A harness from an HF or Si will not work, as it will not plug into the vehicle harness.

 

My ZC is a 3rd gen meaning it is OBD0. My crx is base, which i assume is the same as a crx dx? crx's confuse me a little as i am still learning about them so sorry if i get a little confused. But everything i can find says an OBD0 crx dx is DPFI and OBD1 is MPFI. Could I use a OBD1 harness on my OBD0 engine?

Edit: NVM Sorry lol misread your post. :/

 

There are no CRXs that are OBD1 from the factory in the States.
Your engine harness must match your chassis harness so if you are getting the Si CRX then you could use the chassis harness from it as well as the engine harness but it is quite a lot of work to change it all over.