Not a ficht expert, but from what I understand about the OMC DFI,The ECU has a start circuit that increases the pulsewidth of the injectors to "choke" it if you will. Mercury EFI does this as well by tripling the normal pulsewidth for start up when the engine is below a certain tempature. You may want to call DFI Technologies at (866) 298-1510. They may be able to tell you over the phone what you need to do. They are the ones who made it!!!!! Hope this helps!