Quote:
Originally Posted by kevinmarathon
does any one think if you could put the switch on only two cylinders, you could have a button to run on 2 or 4 cylinders?
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The real problem is that this won't actually save any fuel unless the car is set up to know how to do this. If you turn off 2 cylinders, the car's O2 will see FAR to much oxygen in the exhaust stream. It will assume the car is running super lean, and will richen the mixture. This will dump twice as much fuel into the two running cylinders. All the extra fuel and air will then burn in the cat, and will probable reduce it to a puddle of molten metal under your car.
The GM pickups that do this shut off the valves on the side that isn't running, thereby reducing pumping losses for those cyclinders, and not messing with the O2 sensors.