i have a 89 si crx with a b20b with a b16 head (i bought the crx with the b20 swapped already). and i want to swap the b20 into my Dx 91civic hatchback but the wiring harness that connects to the intake manifold in the crx is diffrent then in the civic. why are these diffrent? wht would i do to make the wiring the same in the civic as the crx?

 

They're different because the CRX is an Si model with multipoint fuel injection(4 injectors) and the Civic is a DX model which has dual point injection(2 injectors). The easiest way is to go to HASport.com and pick up their harness conversions.

 

checkout http://www.rywire.com - Much better pricing than hasport and we have a much faster turn-around time. We offer the best technical support out there.
This swap requires the DX harness be sent to us at rywire, and we can rewire the whole thing to MPFI with the correct plugs for your swap.
Talk to you soon, you're welcome to call the # on weekends.