Look into an HPTuners device. It'll cost you some $$$ ($500 new - a little less used), but then you have complete control over the cars ECM/TCM - you can change whatever you want. I'd be willing to bet that you can disable AFM with HPTuners. Plus, you can use it to tune other things on the vehicle (shift points, fueling, fan control, you name it and it can change it).Unfortunately I just bought this one and I am in it for the long haul. The car has been immaculately cared for its entire life. There is not one spec of rust on it, not even a scuff in the paint. Just has high miles.
I make my living breathing new life into other peoples outcasts so an engine swap on an impala is not really even what I would consider a project. I just want to be sure I can swap in a non AFM engine before I lay down the cash and put forth the effort only to haul it to the dealer and they cant reprogram the computer.
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