Standard Ignition AC543 Idle Air Control Valve

Idle Air Control Valve for Stable Engine Idle

Standard Ignition AC543 is an idle air control valve built for precise idle-speed management in fuel-injected engines. It works with the vehicle sensors and engine computer to respond quickly when idle conditions change, helping maintain steady operation at stoplights, in traffic, and during cold starts.

Fits 1999-2004 Jeep Grand Cherokee, N/A; Fits 2002-2003 Dodge Ram 1500, N/A; Fits 2002-2003 Jeep Liberty, N/A; Fits 2000-2002 Dodge Dakota, N/A; Fits 2002 Dodge Durango, N/A; Fits 2000-2001 Dodge Durango, N/A.

Key Features

• Standard Ignition AC543 idle air control valve
• Gaskets included for the installation interface
• Hardware included
• 1-port, 4-terminal design
• Uses a polymer-blended, injection-molded neodymium-iron-boron magnet assembly
• Controls pintle movement in very small increments for accurate throttle bypass airflow adjustment
• Built with materials selected for long service life and consistent operation

Detailed Description

The Standard Ignition AC543 idle air control valve regulates bypass airflow at the throttle body so the engine computer can maintain the target idle speed. Its magnet design uses alternating pole sections to move the pintle with fine control, which supports smooth idle correction when engine load changes from accessories, temperature, or shifting into gear. This part cross-references Delphi CV10153 for the same application.

For Jeep Grand Cherokee, Dodge Ram 1500, Jeep Liberty, Dodge Dakota, and Dodge Durango applications, AC543 is a direct replacement option for restoring idle control performance on the listed model years.

Common Problems It Can Help Address

• Unstable or fluctuating idle speed
• Stalling when coming to a stop
• High or low idle after startup
• Idle speed that changes when accessories turn on
• Rough idle caused by worn throttle bypass control

Installation Notes

• Verify the connector style, 4-terminal layout, and 1-port configuration before installation.
• Inspect the throttle body and mating surfaces before fitting the included gasket.
• Clear any stored idle-related fault codes after installation and perform the required idle relearn procedure if the vehicle calls for one.
• Confirm vehicle-specific fitment for the listed Jeep and Dodge applications before ordering.

Quality Assurance

Standard Ignition manufactures this idle air control valve with high-grade materials and a magnet design intended for precise pintle control and durable operation. The AC543 is built to support consistent idle regulation across the listed Jeep and Dodge applications.