Quote Originally Posted by Six_Shooter View Post
7747 ECM? If so did you also swap the CALPAK for a V6 CALPAK? If you didn't you are likely seeing a cyl count mismatch. Soft codes won't be stored if you turn the key off, so you need to stall the engine if you want to pull a code set while running. Disconnecting power from the coil will stall the engine. However a cyl count mismatch should come up without the engine running.
I will pick up a V6 CALPAK and give that a try.
I was told by the person who burned my prom chip that the CALPAK did not matter if it was from a V6 or V8.
I have a 1228062 ECM on hand, any chance that the V6 CALPAK from an ECM 1228062 would work in my 1227747 ECM?