k i just got done with this wiring job in a ef hatch. Did a dx harness converted up to mpfi in a si car. Got everything figured out but there is a solid blue wire on the driver side shock tower that im not 100% sure were it goes. On the dx side there is no blue wire and it isnt the injector wire (light blue). I was thinking tach lead but tach still works and i was thinking eacv but it is not kicking a code for the eacv. The car doesnt have a single code so i am kind of lost.

 

if it runs with no codes leave it. what plug is it on?

 

it was on the round 8 pin on the si driver side but since i had to repin those wires plus 4 more i had to get the dx 14 pin

 

the dark blue wire in the Si 8-pin connector is for the Fast Idle Control Valve found on the back of the intake manifold on the 89-91 Si

 

thats what i was thinking but i wasnt sure.