i put a 95 sohc vtec in a 91 civic si with the si wiring and it starts with the si distributor but cant adjust timing and the vtec distributor doesnt plug in because its obd1 and the si wiring is obd1 i dont know what to do to make the vtec distributor plug in to the si wiring some body help

 

you have to convert your car to obd1.

search for obd0 to obd1 conversion.