Project FD RX7 Restomod: Part 9 – Air Pump Removal and FFE Idler Pulley - Page 4 of 5

13B REW FD RX7 Air Control Valve (ACV) We then turned our attention to removing the Air Control Valve (ACV) mounted on the lower intake manifold.

FD RX7 Air Control Valve ACV The ACV is a solenoid that regulates air from the Air Pump to the exhaust ports, the catalytic converter, or a dump to atmosphere depending on conditions determined by the ECU. Air is diverted to the cat only when cruising in 5^th gear to lower emissions.

Here’s the OEM diagram for how the ACV system works. For more information on how this system and the rest of the emissions systems work, read here.

FD RX7 ACV Removed With the ACV removed, we can install the block-off plates.

FD RX7 Full Function Engineering ACV Blockoff Plate We installed the Full Function Engineering 6061 T6 Anodized Aluminum ACV Block-off Plate and stainless hardware for a much cleaner and simpler configuration.

Full Function Engineering FD RX7 Split Air Pipe and ACV Tube Blockoff Plates On the back of the lower intake manifold towards the firewall, we installed the block-off plates for the Split Air Pipe and ACV Tube.

Full Function Engineering FFE EGR Blockoff Plate On the turbo-side of the lower intake manifold, we installed the Exhaust Gas Recirculation (EGR) block-off plate.