Intake Manifold Runner Control (IMRC)

The air induction system improves engine performance by using the IMRC assemblies as follows:

1. The lower intake manifold has two runners per cylinder, feeding each of the intake ports in the cylinder heads.
2. The IMRC assemblies are located between the upper intake manifold and cylinder heads, providing two air passages for each cylinder.
3. One air passage is always open and the other passage switches from closed to open by means of a valve plate.
   • Below 2450 rpm, this valve plate is closed to improve fuel economy and emissions.
   • Above 2450 rpm, this valve plate opens to improve high speed engine performance.

The valve plates are opened and closed by the IMRC electric actuator, which is controlled by the PCM.