Standard Ignition AC478 Idle Air Control Valve

Reliable Idle Air Control Valve for Toyota Avalon and Sienna

The Standard Ignition AC478 Idle Air Control Valve is designed to maintain proper engine idle speed in Toyota Avalon and Sienna models. This component ensures smooth engine performance by regulating airflow during idle conditions.

• Compatible with Toyota Avalon and Sienna vehicles
• Part number AC478 for precise identification
• Controls engine idle speed by managing airflow
• Direct replacement for factory idle air control valves
• Durable construction for consistent operation

Product Overview and Functionality

The Standard Ignition AC478 Idle Air Control Valve plays a critical role in the fuel injection system by regulating the amount of air entering the engine when the throttle is closed. This helps maintain a stable idle speed, preventing stalling and rough idling. Designed specifically for Toyota Avalon and Sienna models, this valve meets OEM specifications to ensure proper fit and function.

Common Issues Addressed by the AC478 Idle Air Control Valve

• Engine stalling or rough idle
• Unstable or fluctuating idle speed
• Difficulty starting the engine
• Check engine light related to idle control
• Reduced fuel efficiency due to improper air regulation

Installation Notes and Tips

Installation of the Standard Ignition AC478 Idle Air Control Valve should be performed with the engine off and cooled down. Ensure the mounting surface is clean before installation to prevent air leaks. It is recommended to check the electrical connector and wiring for damage prior to installation. After replacement, allow the engine control module to recalibrate idle settings by running the engine through a warm-up cycle.

Quality Assurance and Warranty Information

Standard Ignition parts are manufactured to meet or exceed OEM standards, providing reliable performance for Toyota Avalon and Sienna vehicles. The AC478 Idle Air Control Valve undergoes rigorous quality control testing to ensure durability and proper operation. Warranty coverage details are available through Standard Ignition and typically include protection against defects in materials and workmanship.