I have a 1998 honda civic canadian si/american ex (d16y8 vtec obd2a). I recently purchased a fully dressed b18b1 engine swap from a 2001 integra (obd2b). I got the harness from the integra also. Ive been reading a lot of treads but haven't got a straight answer. I'm confused about wiring and would like to know everything i need to do before i pull my old engine out. I'm using my stock obd2a harness from my civic and i have the obd2b p75 ecu from the b18. im assuming id just need a obd2a to obd2b conversion harness correct? i know i have to swap the plug on my dizzy and extend the iacv plug to fit. is there anything else i need to know? would it be worth converting to obd1? whats needed to switch to obd1?

 

Ok, really simple. You use your current OBD-2A engine harness and modify/shorten/lengthen/change plugs as needed. You cannot use the OBD-2B P75 ECU because it has an immobilizer, so forget about purchasing an OBD-2A to 2B harness adapter... just find an OBD-2A P75 manual ECU and plug it straight in. Also, use a '96-99 LS distributor and it will plug right into your original engine harness.

 

thanks man! seems like everyone converts to obd1. but why is what I'm wondering

 

So that you can tune it. You can install a race-cat or test pipe and not get the secondary O2 sensor CEL. You can go that way by simply purchasing an OBD-2A to OBD-1 ECU harness adapter and a '94-95 P74/75 ECU. The OBD-2A distributor will work with the OBD-1 ECU.