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So I was wondering if you could swap a 4 valve 5.4 and a 3 valve 5.4 engine without changing the ecu's
 

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I'm going to go out on a limb and say no. I tried crossing 5. with 3V ECM's to 5.4 4V and I couldn't get parts to match.
 

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Im assuming youre asking about swapping a 4v in place of a 3v. As CatSkinner said no, you will throw all sorts of codes and it will run like crap due to no charge motion plates, cam phasers, knock sensors, etc...


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