Dorman 977-851 Fuel Injection Throttle Body

Overview of Dorman Fuel Injection Throttle Body 977-851

The Dorman 977-851 Fuel Injection Throttle Body is designed for precise airflow control in Audi and Volkswagen vehicles, including the A4, A4 Quattro, and Passat models. Engineered with durable aluminum and a silver finish, this throttle body supports gas fuel systems and includes an integrated idle air control motor for optimized engine performance.

• Compatible with Audi A4, A4 Quattro, and Volkswagen Passat
• Constructed from aluminum with a silver finish for durability
• Includes idle air control motor for stable idle operation
• Features a 65mm inlet diameter with flanged inlet type
• Single outlet with 56mm bore diameter and non-flanged outlet
• Gasket or seal included for proper installation
• Designed for gas fuel injection systems with 12 airflow rate

Detailed Product Description

The Dorman 977-851 throttle body is a critical component in the fuel injection system, regulating the amount of air entering the engine to ensure efficient combustion. Made from high-quality aluminum, it offers corrosion resistance and long service life. The silver finish provides additional protection and a clean appearance. This throttle body features a 65mm flanged inlet and a 56mm non-flanged outlet, designed to match the specific airflow requirements of compatible Audi and Volkswagen models. The included idle air control motor helps maintain consistent engine idle speed under varying conditions. A gasket or seal is included to ensure a secure and leak-free installation.

Common Applications and Problem Resolution

• Restores proper throttle response and engine acceleration
• Resolves rough or unstable idle issues caused by faulty throttle bodies
• Eliminates air leaks that can lead to poor fuel economy
• Addresses check engine light codes related to throttle position sensor or idle air control
• Improves overall engine performance in Audi A4, A4 Quattro, and Volkswagen Passat

Installation Notes and Tips

Installation of the Dorman 977-851 throttle body requires removal of the existing throttle body and careful alignment of the gasket or seal included. Ensure all electrical connections to the idle air control motor are securely attached. Since mounting hardware is not included, reuse the original fasteners or acquire appropriate replacements. It is recommended to clean the throttle body mounting surface before installation to prevent air leaks. After installation, perform a throttle body relearn procedure if required by the vehicle’s ECU.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM specifications, ensuring reliable performance and fitment. The 977-851 throttle body undergoes rigorous quality control testing to maintain consistent airflow and idle control. This part is backed by Dorman’s limited warranty, providing coverage against defects in material and workmanship for a specified period. Refer to Dorman’s warranty documentation for detailed terms and conditions.