1990 2.3 mustang with 1991 2.3 engine,engine harness and computer wiring problem

capriman · 11-04-2007

I have installed a 1991 2.3 engine,engine harness and computer into a 1990 mustang. the problem iam having is the engine harness to car harness is pinned differently.i have the car where it will start and run everything works except the tach.also i forgot to mention the 1990 mustang was speed density the 1991 engine and harness are maf. any help would be greatly appreciated thank

BIG G · 11-15-2007

you need to run the 90 engine harness in the 90 car, if you run the 91 engine harness you need to swap the entire harness for the 91, big G

capriman · 12-27-2008

finally found the problem crossed 2 pins at ecm same color wires.