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The active fuel management is controled by oil pressure. It has a collapsible lifter that is two pieces, allowing half the lifter to move on the cam, but not activating the rocker arm and opening the valve. The GM training rep said that if it ever does malfunction, the cylinder won't deactivate, so you don't have to worry about the engine getting stuck running on only 4 cylinders.
Last edited by Sterling; 11-15-2007 at 01:20 AM.
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