D16y8 into 89 honda civic ef. I know I have to go dpfi to mpfi first. Then can I just buy a jumper harness from obd 0 to obd 1, plug and play and then my y 8 harness should be able to plug into the ef right? Any help would be greatly appreciated, other motor is out and at a standstill with the d16y8 just sitting on the engine jack

 

Y8 is OBD2. add in another conversion harness if you're planning to run an OBD1 ECU.

OR- and I don't know how much your time is worth... but unless you really like electrical troubleshooting just buy this setup from Rywire. You tell them the chassis and engine setup and they send you what you need. instructions at the bottom of the page if you want to familiarize yourself with what's involved.

I've done similar conversions in the past doing all of the re-pinning and harness adaptation myself, but I have a background in engineering and R&D. If I were doing it again today I would probably still go with the commercially available solution since all of the connectors you'd be working with are now decades old and brittle.

 

I got p28 ecu, i got obd0 to obd 2 jumper for ecu, dizzy. Once those jumpers come in I plan on just using my dx stock harness and just using the jumpers so that the y8 plugs into the old harness so I don't have to splice or cut any connectors off. If this is wrong please tell me, spent the past week researching and reaching out to people and I can't get 1 straight answer. I was told to just go obd1 cause obd2 really sucks and overcomplicates ****.

 

P28 is far better than trying to work with the P2P for the Y8. probably works fine with the stock maps I would guess.

do you mind sharing the part numbers or source for what you have ordered? There may be a workable solution available, but I think you're still missing a puzzle piece or two.

From what I remember of the EF the engine harness terminates in the engine bay near the underhood fuse box. a stock Y8 engine harness terminates at the ECU under the dash (technically in the right hand kick panel.) there is also a connector on the left side- I think that goes to the fuse box under the dash... not sure but doesn't matter at the moment. So at a minimum you'll need something to adapt those to the engine harness too.

-So ECU adapter would let you connect an OBD2 ECU to the stock chassis harness. It sounds like you have this on order already.
-engine harness adapter(s) let you connect the engine harness to the stock chassis harness. this is probably the missing piece. A big problem I see is the terminals on the Y8 engine harness at the ECU are not weather tight since it's intended to be inside the passenger compartment, but a jumper harness would place these in the engine bay.

Is the distributor adapter to run an OBD1 distributor on the Y8?

Part of the reason I suggested going with a full Rywire harness for the engine is that it is built to order. You tell them what you have and then rely on their expertise to make it all work.