This is what I have

1989 CRX
D15b vtec
dpfi -> mpfi wiring conversion
obd0 -> obd1 adapter
p28 ecu from d16 civic
newer injectors with no resistor box
4 wire o2 sensor

1989 CRX Si
b16 swap
obd0 pr3 ecu?
older injectors with resistor box
2 o2 sensors?
broken engine, needs distributor

I am looking at a couple different options to get the Si up and running

1) buy b16 for about $700 shipped from h-motors, maybe cheaper since I bought quite a bit and they shorted me a light on my front end coversion.

2) possibly rebuild this engine, but without taking the head off yet, I'm guessing it's not pretty, there was a smashed sparkplug and some oil in the cylinders.

3) take the d15 out of the other car and install it, but I'm not sure if the engine wiring harnesses and car wiring harnesses would match up, especially after the b16 changeover.

I'm not looking for a fast car, just a car that runs, the Si has a decent body, the other has some frame damage and needs some major body work I've found, but I could probably get it running fairly easily, everything is there short of some fuel lines and vacuum hoses and either a bad ignition switch or main relay. I really don't care which engine goes in the Si, just which would be the least expensive, least difficult change.

 

if the B16 swap is already complete and in the car, just fix the motor or get another B16 bottom end. Def keep the b.