All Models

The switch-over valves control vacuum flow to EGR valve. Two valves are used in EGR system (a third valve controls full-throttle downshifts on Non-Turbo models). One valve vents vacuum when engine is at idle, while other vents vacuum when engine is at full-throttle operation. Valves are located under a plastic cover on cylinder head cover and are actuated by a throttle linkage cam.