Intake Manifold Runner Control (IMRC) System

Engine power is achieved by closing and opening the intake manifold runner control (IMRC) valve. When the valve is closed, there is high torque at low engine speed. When the valve is open, there is high torque at high engine speed.

Fig 1: Identifying Intake Manifold Runner Control System Diagram

Courtesy of AMERICAN HONDA MOTOR CO., INC.