Can I use the engine harness in a si on a civic DX. Why or Why Not.

 

No because the main plugs that go to the ECU etc... on the engine side of the firewall are different. Unless you want to rewire or replace plugs.

 

you can but you have to convert the dx intake manifold to the si intake manifold because the dx is dual point fuel injection (2 fuel injectors), si is multi fuel injection (4 injectors) and you will also need the si ecu.

 

NO!!! GOD NO!!!! DO NOT USE OTHER VEHICULES WIRING HARNESS!

MPFI swap is seriously like 4 or 6 wires, I forget. Get a spare plug for the pins and soder and pin your wiring harness to the new ecu. Your car will thank you by not having random plugs hanging out and the wrong plugs in wrong places! Trust me. A now ex-friend put an 91 Si harness in his 88. The engine light would not come off and he had major issues with it running. Not to mention he is a complete retard with swaps.

Do like I did, get the proper pin out and wiring info, and grab some wiring, some soder and some redbull and give er! It was my first wiring job by myself and she started up no problem.

 

You may want to leave the Red Bull out though. That can get a bit scary.

 

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HEHE, couldnt have said it better myself. If you want the rundown, give me a call at rywire. Ill explain why, and ill offer you our services if you need them.