i got a 91 civic dx whit a 92 ls motor..... as most of u know those dx come dpfi and was resently done to mpfi... they had put an si harness on there .. the car does not run ..it cranks but it wont turn on... do u have to change the fuse box to si too or can u use the same dx one ... can some one please help me out .. i been at it whit this for like a month and still cant figure it out..

 

you can not just hook up a si engine harness. you have to use the factory dx harness and mpfi convert it. very easy to do 4 wires.

or you can swap out your main harness to a si harness to use the si engine harness. but more p.i.t.a work than 4 wires.

 

yeah ...the harness under the dash is from an si but im not sure if the dx fuse box makes a difference...