hello its me again with my misfiring au, I put in another E.C.U to see if that
would change things but ofcourse the the engine systoms dont seem to recognise the new E.C.U and the car wont start, does anyone know what needs to be done to fix this situation.

iaian

Same ecu code as your old one?

if its a series 2 or 3 you will need an auto electrician with scan tools or take it to ford to get the ecu,bcm and key re coded to each other.

which key ?
note different key ring section - if smartlock leave ignition reds on for 60 min,if smartshield as per troyman to program (needs 2 keys)