Originally Posted by
jaje
all 88-91 civics / crxs are fuel injected...there is just 2 types
dpfi (dual point) which only 2 injectors spray into the intake manifold itself (closer to the throttle body)
mpfi which 1 injector per cylinder (4 total) spray fuel immediately before the intake on the cylinder head)
mpfi > dpfi in power, efficiency
I second that.
Also, I don't believe 90 dx main harnesses will plug into 91 si engine harnesses(without some modification). You could try it, but chances are they are different and are gonna require modding to work.