Idle Air Control (IAC) Valve Assembly

Precision Idle Stability for Mitsubishi 3.0L and 3.5L V6 Engines

Restore smooth engine operation and eliminate frustrating stalling with this premium Idle Air Control (IAC) Valve. Specifically engineered for Mitsubishi’s refined V6 platforms, this valve acts as the critical air bypass regulator for the throttle body. When the engine is at a standstill, the IAC valve precisely adjusts the volume of air entering the intake manifold to maintain a steady RPM. Over time, internal stepper motor failure or heavy carbon fouling leads to erratic idling, "hunting" RPMs, or engine stalling when the air conditioning is engaged or during cold starts.

This replacement unit features a high-grade internal motor and heat-resistant housing designed to withstand the thermal cycling of the engine bay. Built as a direct-fit solution, it ensures your vehicle’s Engine Control Unit (ECU) can accurately calibrate the idle speed, restoring the quiet and reliable performance your Mitsubishi was designed to provide.

Fitment Verification and Vehicle Applications

This valve is designed for the 3.0L and 3.5L V6 engines. Please verify your specific model and engine displacement:

• Mitsubishi Diamante: 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004.

• Mitsubishi Montero (V6 3.5L): 1994, 1995, 1996, 1997, 1998, 1999.

• Mitsubishi Montero (V6 3.0L): 1995, 1996.

• Mitsubishi Montero Sport (V6 3.0L): 1997, 1998, 1999, 2000, 2001, 2002, 2003.

• Fitment Note: Ensure your factory connector matches the pin configuration of this unit. This valve is intended for the V6 engine configurations listed above.

Technical Specifications and Attributes

• Component Type: Stepper Motor Idle Air Control Valve.

• Housing Material: High-Strength Composite and Aluminum.

• Connector Type: Direct-fit Multi-pin Female Plug.

• Operation: Regulates bypass air for consistent RPM management.

• Hardware: Includes a high-grade sealing O-ring for a vacuum-tight installation.

• Fitment Type: Direct Replacement.

What’s in the Box

• (1) Idle Air Control (IAC) Valve

• (1) Installation Sealing O-ring

Industry Cross-Reference Numbers

• Mitsubishi: MD614678, MD614751

• Standard Ignition: AC249

• TRQ: AIA93064

• Dorman: 605-103

• Walker Products: 215-1014

Installation and Technical Tips

• Clean the Bypass Port: Before installing the new valve, use a dedicated throttle body cleaner to remove carbon buildup from the idle air bypass port in the throttle body. A clogged port will prevent even a brand-new valve from regulating the idle speed correctly.

• Vacuum Leak Prevention: Always use the included new O-ring during installation. A tiny air leak at the base of the IAC valve will cause a "high idle" condition that the vehicle’s computer cannot correct.

• ECU Relearn Procedure: After installation, the vehicle may require an idle relearn. Start the engine and let it idle for 10 minutes without touching the accelerator. Then, turn on the A/C for 5 minutes. This allows the ECU to synchronize with the new stepper motor's range of motion.

• Connector Inspection: Inspect the wiring harness connector for brittleness or corrosion. A loose or damaged clip can cause intermittent signals, often leading to a P0505 diagnostic trouble code.