On my '02 Jeep Liberty (3.7), I have a constant "open circuit" on #2 injector. This started when the #2 cyl. dropped the valve seat. I put on a new head and new pistons. Everything worked well, except the open circuit,(dead injector). I replaced all injectors and coils but no change. Anybody have any Ideas of what to check for this problem? It has a tan and orange wires, the orange is 12v, and the tan has no ground pulse.