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 System
Intake Manifold Runner Control (IMRC) system uses a series of valves inside intake manifold to control length of intake air path. Intake air path has 2 lengths; short and long. Increased engine torque or power over a broad operating range is achieved by using valves to switch between paths. This results in high torque at low engine speed and high power at high engine speed.
High torque at low speed is achieved when IMRC valve(s) are closed. High power at high engine speed is achieved when IMRC valve(s) are open.
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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.