Intake Manifold Runner Control (IMRC) actuator (6.8L [3V] only)
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The air induction system improves engine performance by using the IMRC as follows:
- The intake manifold has 2 runners per cylinder, feeding each of the intake ports in the cylinder heads.
- The IMRC assemblies are located between the upper intake manifold and cylinder heads, providing 2 air passages for each cylinder.
- The valve plates are opened and closed by the IMRC electric actuator, which is controlled by the PCM.
- One air passage is always open and the other passage switches from closed to open by means of a valve plate.
- Below 1, 500 RPM, this valve plate is closed to improve fuel economy and emissions.