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Intake Manifold Runner Control (IMRC) Electric Actuated System

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WARNING: SUBSTANTIAL OPENING AND CLOSING TORQUE IS APPLIED BY THIS SYSTEM. TO PREVENT INJURY, BE CAREFUL TO KEEP FINGERS AWAY FROM LEVER MECHANISMS WHEN ACTUATED.

The IMRC electric actuated system consists of a remote mounted motorized actuator with an attaching linkage for each housing on each bank. The linkage attaches to the housing butterfly plate levers. Some variations can have either 2 intake air passages for each cylinder with one passageway that is always open and the other is opened and closed with a butterfly valve plate. The other type has a butterfly valve with a small passageway that opens up into a larger size orifice when the butterfly plates are opened. The butterfly valve plates are opened and closed by an electric motor and the motorized actuator houses an internal switch or switches, depending on the application, to provide feedback to PCM indicating the butterfly valve plate position. If the IMRC system is not working correctly then a DTC will be set.

Below approximately 3,000 RPM, the motorized actuator will not be energized. This will allow the linkage to fully extend and the butterfly valve plates to remain closed. Above approximately 3,000 RPM the motorized actuator will be energized. The attaching linkage will pull the butterfly valve plates into the open position. Some vehicles will activate the IMRC near 1,500 RPM.

  1. The PCM uses the throttle position (TP) sensor and crankshaft position (CKP) signals to determine activation of the IMRC system. There must be a positive change in voltage from the TP sensor along with the increase in RPM to open the valve plates.
  2. The PCM uses the information from the input signals to control the IMRC motorized actuator based upon RPM and changes in the throttle position.
  3. The PCM energizes the actuator to open the butterfly plates.
  4. The IMRC housing contains butterfly plates to allow increased air flow.
    Fig 1: Intake Manifold Runner Control (IMRC) Overview
    G03877945Courtesy of FORD MOTOR CO.
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