Ill check for that relay in the fuse area. This van has the actual big relay integrated in the starter, not one on the side of the fenderwell like a lot of Fords have/had.

I don't have a security key, when I replaced the ignition cylinder the locksmith asked the same question. It ran fine was it came back from the shop the first time and this was after I already changed the lock cylinder. There isn't anything special about the key either. I don't have a check engine light on but I can check with a scanner.