Standard Ignition AC12 Idle Air Control Valve

Idle Air Control Valve for Jeep Applications

Restore stable idle control with the Standard Ignition AC12 idle air control valve. This OE-style replacement is built for Jeep Cherokee, Comanche, Wagoneer, and Wrangler applications from 1986-1990, with fitment coverage for the specific models listed below.

• Polymer-blended, isotropic neodymium/iron/boron magnet for accurate pintle and airflow control
• High-strength stepping motor for strong actuator output
• Shielded ball bearing helps resist environmental contaminants
• Load-tested actuator for added durability and consistent performance
• Includes gasket and hardware
• 1-port, 4-terminal design

Detailed Product Overview

The Standard Ignition AC12 idle air control valve regulates bypass air around the throttle plate to help maintain proper idle speed under changing engine loads. It is built with high-grade materials and a stepping motor assembly engineered for precise movement, while the shielded bearing supports longer service life in demanding underhood conditions. This part cross-references Gates 21771 for the same application.

Fits 1986-1990 Jeep Cherokee, N/A. Fits 1986-1990 Jeep Comanche, N/A. Fits 1986-1990 Jeep Wagoneer, N/A. Fits 1987-1988 Jeep Wrangler, N/A.

Common Issues This Part May Resolve

• Unstable or fluctuating idle speed
• Engine stalling when coming to a stop
• Idle speed that is too high or too low
• Poor idle recovery after accessory load changes
• Idle control faults related to a worn actuator or contaminated valve

Installation Notes and Tips

Before installation, inspect the throttle body and air passages for carbon buildup and clean as needed. Replace the gasket during service, verify the connector terminals are clean and secure, and confirm the valve seats properly before clearing any stored idle control codes.

Quality Assurance

Standard Ignition manufactures this AC12 idle air control valve with load testing and durable materials to support consistent actuator force and long service life. The design uses a shielded bearing and precision motor components to help maintain accurate idle air control in Jeep Cherokee, Comanche, Wagoneer, and Wrangler applications.