latinrotor

has any body done this before the wires of the ecu are not alike what can i do i have all the 91 set up and i cant return it please help

idsigloo

You need to get an s5 ecu and wiring harness. The s4 won't work because there is alot more stuff the s5 ecu controls. Ex: The Oil Metering Pump (OMP) on the s4 is mechanically controlled where on the s5 it is controlled by the computer.

latinrotor

i have a 91 mazda rx7 that i use for parts so i have to swap the wireing that goes under the dash board

RETed

You need to get your hands on both the 1986 - 1988 and 1989 - 1991 FSM's so you know what the wire colors are on the both sides of the plugs.
It's a matter of connecting the matching wires.


-Ted