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IMRC stands for intake manifold runner controller. It is used for emission control and performance. your intake manifold has plates inside that are connected to a rod and tghe connected to the control motor. each bank of the engine can be opened and closed by the motor depending on engine load and other things.
The Intake Manifold Runner Control (IMRC_ system found in the Honda / Acura K series engines has to do with the intake manifold and the butterfly actuated runner system thatâs been used so often in small displacement motors.he Intake Manifold Runner Control (IMRC_ system found in the Honda / Acura K series engines has to do with the intake manifold and the butterfly actuated runner system thatâs been used so often in small displacement motors.