Dorman 911-644 Secondary Air Injection Control Valve

Overview of Dorman Secondary Air Injection Control Valve 911-644

The Dorman 911-644 Secondary Air Injection Control Valve is designed to support emission control systems in select Lexus and Toyota vehicles. This valve helps regulate air injection to reduce harmful emissions, ensuring compliance with environmental standards.

• Compatible with Lexus 4Runner, GX470, Land Cruiser, LX470 and Toyota Sequoia, Tundra models
• Constructed from durable aluminum and plastic materials
• Measures 6 inches in length with a maximum diameter of 0.76 inches
• Features two hose connectors and two electrical connectors with male blade terminals
• Includes two mounting holes with a diameter of 0.34 inches each

Technical Specifications and Features

The Dorman 911-644 valve features a compact design with a length of 6 inches and a maximum diameter of 0.76 inches, making it suitable for tight engine compartments. It has two ports, each with an inside diameter of 0.6 inches, facilitating efficient air flow. The valve includes two hose connectors and two male blade terminals for secure electrical connections. Mounting is supported by two holes, each 0.34 inches in diameter, though mounting hardware is not included. The combination of aluminum and plastic materials ensures a balance of strength and corrosion resistance.

Function and Application

This secondary air injection control valve is essential for managing the air injection system in emission control setups. It helps introduce fresh air into the exhaust stream during cold starts to reduce emissions and improve catalytic converter efficiency.

• Reduces cold start emissions by controlling air injection
• Prevents check engine light triggers related to air injection faults
• Helps maintain proper engine performance and fuel efficiency
• Addresses issues with rough idling caused by faulty air injection valves
• Supports compliance with emission regulations for Lexus and Toyota vehicles

Installation Notes and Tips

Installation of the Dorman 911-644 valve requires basic mechanical skills and appropriate tools. Ensure the vehicle is cool and the engine is off before beginning. Verify the valve’s fitment with your Lexus or Toyota model, specifically 4Runner, GX470, Land Cruiser, LX470, Sequoia, or Tundra. Since mounting hardware is not included, retain original fasteners or acquire suitable replacements. Check all hose and electrical connections for secure fitment to prevent leaks or electrical faults.

Quality Assurance and Warranty

Dorman manufactures this secondary air injection control valve to meet or exceed OEM standards. The use of aluminum and plastic materials provides durability and resistance to corrosion. While mounting hardware is not included, the valve is designed for reliable long-term operation. Please refer to Dorman’s warranty policy for specific coverage details related to part number 911-644.