Standard Ignition AC503 Idle Air Control Valve

Idle Air Control Valve for Ford Applications

The Standard Ignition AC503 idle air control valve helps regulate bypass air at idle for stable engine speed and smoother throttle response. It is built with a polymer-blended, isotropic neodymium/iron/boron magnet, a high-strength stepping motor, and a shielded ball bearing to support accurate pintle movement and long service life.

Fits 2004 Ford E-150, N/A. Fits 2004 Ford E-150 Club Wagon, N/A. Fits 2004 Ford E-250, N/A. Fits 2004 Ford Expedition, N/A. Fits 2002-2004 Ford F-250, N/A. This part cross-references Eastern Catalytic 50617 for the same application.

Key Features

• Standard Ignition AC503 idle air control valve for fuel injection systems
• Polymer-blended neodymium/iron/boron magnet for precise pintle control
• High-strength stepping motor for consistent airflow regulation
• Shielded ball bearing helps resist environmental contaminants
• Load-tested actuator for added durability and performance consistency
• 2-terminal electrical connection
• No gasket included
• No hardware included

Detailed Description

The AC503 is an idle air control valve engineered to manage idle airflow on select Ford trucks and SUVs, including the 2004 Ford E-150, 2004 Ford Expedition, and 2002-2004 Ford F-250. By controlling the amount of air that bypasses the throttle plate, the valve helps the engine maintain a steady idle under changing load conditions such as accessory use, cold starts, or stop-and-go driving. Standard Ignition builds this unit with durable internal components and tests the actuator under load to verify output force beyond actual operating demand.

What It Helps Solve

• Unstable or fluctuating idle speed
• Stalling when coming to a stop
• Idle speed that is too high or too low
• Rough idle after startup or when accessories are turned on
• Airflow control issues related to a worn idle air control valve

Installation Notes and Tips

Verify connector style and mounting location before installation. This valve uses a 2-terminal connection and does not include a gasket or hardware, so reuse or replace related sealing components as needed. Clean the throttle body and idle air passages during service to help restore proper airflow control. Confirm vehicle fitment by year, make, and model before ordering.

Quality Assurance

Standard Ignition manufactures this idle air control valve with high-grade materials and component testing focused on durability, airflow accuracy, and long-term operation.