I'm helping a friend swap a 91 b18 ls engine on his 91 Si hatch. I know what we need to do as far as swapping the engines in and out. I've been searching for the past 2 hours more info about the wiring changes, if any, required.
Can someone just let me know if there are any major witing changes that have to be made. Will the b18 ecu plug right in and what about all the sensor plugs will they work fine.
Thanks

 

from the top of my head...
the ecu should be fine. 91 pr4 is a white plug obd0. but only white plugs will fit. the wiring should be all plug and play. but let me know if something is wrong. good luck

 

Thanks, that helps a lot, then it should be pretty easy to do. I'll let you guys know how it comes out with pictures of course.