Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Intake Manifold Runner Control (IMRC)
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 |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.