So i dont know to much about anything when it comes to wiring swaps.I happen to come across a cheap ls long block,Its a 91 so its obd-0 .What do i have to do as far as wiring when droping into a 90 civic hatch.i have no idea what the model is..It has crank windows no sunroof and had drums in the back so im guessing its a econo version which is dx??? lx???? which means its obd-0? which means i can use the d15's fuse's and main relays??

 

a 90` hatch is obd-0 which you can use the same harness in the hatch with the LS. your best bet is to get a p28 ecu, chip it with a LS base. And purchase an obd0-obd1 conversion harness. you want to run wires off the obd0-obd1 conv harness for a o2 sensor as well (wires are supplied), if you dont plan on using a stand alone o2.

 

if you get a chipped ecu, most of the time, the o2 is disabled.

 

true, on all my cars, i allways disable the o2, and run my data off the aem wideband. just seems to work easier than running that 5v o2 data wire under the dash to the ecu.

 

could you use any obd-1 pr4?? instead of the p28,i just happen to have a obd-1 pr4