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One issue with only shutting down the injector is that air will continue to be pumped through the cylinder. This will result in the oxygen sensor in the exhaust reading lean. The engine management will then richen up all the cylinders in an attempt to achieve a stoichiometric air fuel ratio, resulting in poor fuel economy.
One method that might work would be to have a throttle for the intake runner of the deactivated cylinder. This throttle could be closed when in deactivation mode.
The automotive companies actually use valve deactivation.
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