Ok guy I buy a si harness with out know that was 88 and I but the harnees in my 90 crx dx with a b18b1 swap and I found that the distributor plug In the 88 have less wire so my car is obd1 and they have code 4 and don't let me pass 3500 rpm and I read is for the code 4 that is the cranshaft position sensor my ? Is can I put a 89-90 si engine harness or I have to change the under dash again for a 89-90 under dash harness 2 thank u guy and sorry for my English ll

 

You have to keep the harness that pertains to the car and find the break in the system if any.

 

The harness that come in the cx was all cut and stuff so I take out and I don't have now what can I do