that's an interesting thought. i believe your camry has a firing order of 1-4-3-2, with 1 and 4 firing at the same time, and 3 and 2 firing at the same time.
so my thought is mechanically, you could remove 2 of the pistons and rods, say 1 and 3. this would open the combustion chamber in to the crankcase now, so you would need to disable the valvetrain of the same two cylinders. the easiest way i can think to do this would be to grind the cam lobes so they are not opening the valves.
the question i have is would a twin cylinder have enough power to push the car down the road. maybe maybe not, but unless you have a lot of time and even more money, i wouldn't go to the trouble of trying.
all of this is mechanical i am not sure what would have to be done with the ecm to make it work, but i am sure it would not be easy.
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