Intake Manifold Runner Control (IMRC) Solenoid

Intake Manifold Runner Control (IMRC) Solenoid:

Each (one per bank) variable intake manifold runner is a shaft with three flaps located inside the intake manifold, which is controlled by an externally located vacuum operated diaphragm. As the diaphragm moves above a certain engine speed/load range, the flaps cover intake ports, which change induction airflow characteristics. The ECM controls the intake manifold runner diaphragms by controlling their vacuum supply via the Intake Manifold Runner Control (IMRC) solenoid. The IMRC solenoid is located on the left side of the engine between the intake manifold runner diaphragms. The IMRC solenoid is supplied continuous manifold vacuum, which is transferred to the intake manifold runner diaphragms whenever the solenoid is energized. The ECM controls the solenoid by supplying the circuit ground during higher engine speed/load ranges.