Intake Manifold Runner Control (IMRC)
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. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
The IMRC is a vacuum actuated system with a PCM controlled electric solenoid and manifold mounted vacuum actuators for bank 1 and bank 2. The IMRC solenoid controls each vacuum actuator to activate a shutter device attached to the actuator shaft. There is an intake manifold runner control sensor for each bank to provide the shutter position to the PCM.
The IMRC shutters are in the closed position below 3, 000 RPM to create air flow turbulence for better charge mixing in the cylinder. The IMRC shutters are in the open position above 3, 000 RPM to reduce air flow restriction.
Typical IMRC With 1 Control Solenoid
| Intake Air System | Component |
|---|---|
| 1 | Vacuum Actuator Bank 2 |
| 2 | Manifold Vacuum Supply Line |
| 3 | Vacuum Lines From IMRC Solenoid To Vacuum Actuators |
| 4 | Intake Manifold Runner Control Bank 1 (IMRC1) Solenoid |
| 5 | Intake Manifold Runner Control Bank 1 (IMRC1) Sensor |
| 6 | Vacuum Actuator Bank 1 |
| 7 | Intake Manifold Runner Control Bank 2 (IMRC2) Sensor |
Typical IMRC With 2 Control Solenoids
| Intake Air System | Component |
|---|---|
| 1 | Vent Lines To The Intake Air Tube |
| 2 | Manifold Vacuum Supply Port |
| 3 | Intake Manifold Runner Control Bank 2 (IMRC2) Solenoid |
| 4 | Intake Manifold Runner Control Bank 1 (IMRC1) Solenoid |
| 5 | Vacuum Actuator Bank 1 |
| 6 | Manifold Vacuum Supply Lines |
| 7 | Intake Manifold Runner Control Bank 1 (IMRC1) Sensor |
| 8 | Vacuum Lines From IMRC Solenoid To Vacuum Actuator |
| 9 | Vacuum Actuator Bank 2 |
| 10 | Intake Manifold Runner Control Bank 2 (IMRC2) Sensor |