Ok im getting well bored with this noise now! Im just worried its going to destroy the new lump ive put in.
Im going to have a punt on putting a ECU in it (im clutching a straws to be honest because i have NOTHING to go on).

Is there many different ECU types for 2003 1.6 Focus or will any work ok? I might have to get mine out first to be on the safe side, just not looking forward to removing the shear bolt....