I swaped out my 93 mustang 2.3 to a 93 5.0 ho and used a 93 engine harness with a 89 speed desity ecm , my fuel pump isnt comming on . any ideas ?
could it be that this brain isn't compatible, here is the numbers on the ecm
E4LB-14A459-B SMB-2C

 

I'd say that a Mass air motor and harness probably won't jive with a speed density computer too well (as in, 'at all'). Compare the pinouts for the computers and you'll probably see why. You probably could get the pump to come on, but I expect you'd still be a ways from having it run how you want.

 

Thanks for the info fellas .
im just going to buy the correct ecm a9p