Air Control Valve
Used on 3R-C engine with manual transmission, K-C and 3K-C engines. Valve is located between air pump and anti-afterburn valve. This valve eliminates rough idle on starts. Under certain conditions intake manifold vacuum causes anti-afterburn valve to open, allowing air to enter intake manifold causing a lean air/fuel mixture. Air control valve remains closed until air pump discharge pressure reaches approximately 1.6" Hg. This prevents air flow through anti-afterburn valve.