Standard Ignition AC55 Idle Air Control Valve

Idle Air Control Valve for Ford and Mercury Applications

Standard Ignition AC55 is an idle air control valve built for precise airflow management at idle. It uses 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 1993-1997 Ford F-350, N/A. Fits 1993-1996 Ford E-350 Econoline, N/A. Fits 1993-1996 Ford E-350 Econoline Club Wagon, N/A. Fits 1993-1996 Ford F-250, N/A. Fits 1987 Mercury Topaz, N/A.

Key Features

• Idle air control valve for fuel injection system applications
• Polymer-blended magnet helps maintain accurate pintle and airflow control
• High-strength stepping motor provides strong actuator output torque
• Shielded ball bearing resists environmental contaminants
• Load-tested for force output greater than actual load demand
• 1 hose connector, 2 blade terminals

Detailed Product Overview

Standard Ignition AC55 is engineered to regulate bypass air at idle so the engine can maintain stable speed under changing load conditions. The actuator design focuses on consistent pintle movement, durable motor output, and contamination resistance for dependable operation in Ford truck and van platforms, including the F-250, F-350, and E-350 Econoline, as well as the Mercury Topaz.

This part cross-references Dorman - HELP 31004 for the same application.

Common Issues This Part Can Address

• Unstable or fluctuating idle speed
• Stalling when coming to a stop
• Idle speed that is too high or too low
• Poor idle recovery after accessory load changes
• Airflow control problems related to a worn IAC valve

Installation Notes and Tips

Verify connector style, hose connection, and vehicle application before installation. Inspect the throttle body and related intake passages for carbon buildup, vacuum leaks, or damaged seals that can affect idle quality after replacement. Confirm the blade terminal connection is clean and secure for proper electrical contact.

Quality Assurance

Manufactured with high-grade materials and load-tested for durability, Standard Ignition AC55 is built to deliver consistent idle control performance in service. The design emphasizes accurate actuator response and extended service life in demanding underhood conditions.