4.6is 4.4i engine swap

[The German]

Anybody know for Sure if I can just swap the two engines and replace the 4.6is computer with the 4.4's?

[JCL]

Originally Posted by The German

Anybody know for Sure if I can just swap the two engines and replace the 4.6is computer with the 4.4's?

No, because the only way to find out is to do it, and nobody has tried. However, we do know that the various modules communicate with each other, that they expect certain modules to exist on the bus with them, and that the combination you are proposing was never built by BMW, so it is reasonable to expect that some custom programming may be required if it is even possible. You should also expect error messages and faults.

These aren't '57 Chevs that you can simply bolt in any power you like. It is more akin to putting a different Intel processor in a computer that was never offered with that processor, and not knowing what would happen until you fully debugged it.