Dorman 977-809 Fuel Injection Throttle Body

Dorman 977-809 Electronic Throttle Body

Dorman 977-809 is an electronic fuel injection throttle body built for gas-powered applications that need precise airflow control and reliable throttle response. It includes the throttle position sensor and uses Dorman Sensor Shield technology to help protect the internal electronics from moisture and oil intrusion.

Key Features

• Electronic throttle body for fuel injection systems
• Throttle position sensor included
• Aluminum throttle body construction with natural finish
• Flanged inlet design with 90.02 mm inlet diameter
• 76.13 mm bore and outlet diameter
• 8-terminal male blade electrical connection
• Proprietary butterfly shaft seal helps reduce contamination-related failures
• Direct replacement for select Chevrolet and GMC applications

Detailed Description

This Dorman throttle body is engineered as an OE FIX replacement for vehicles where the original throttle body can fail after moisture and oil contamination affects the internal electronics. The sealed butterfly shaft design is intended to address that common failure point while maintaining electronic throttle control. It is a direct-fit option for select Chevrolet Avalanche 2500, Express 3500, Silverado 2500 HD, Silverado 3500, Suburban 2500, and GMC Savana 3500, Sierra 2500 HD, Sierra 3500, and Yukon XL 2500 applications, along with Chevrolet P30 and GMC P3500 models.

This part number 977-809 also cross-references 67-3017 and 17113565 for the same application. Use it when replacing a worn or malfunctioning electronic throttle body on compatible Chevrolet Silverado 2500 HD throttle body and GMC Sierra 3500 throttle body applications.

What It Helps Address

• Throttle response problems caused by a failing electronic throttle body
• Rough or unstable idle related to throttle plate control issues
• Reduced engine performance from contaminated throttle body electronics
• Check engine light conditions tied to throttle position or airflow faults
• Driveability concerns on select Chevrolet and GMC fuel injection systems

Installation Notes and Tips

Verify the inlet and outlet dimensions, connector style, and electronic throttle body type before installation. This unit does not include mounting hardware or a gasket/seal, so reuse or replace related service parts as needed during the repair. Confirm fitment by year, make, and model before ordering, especially on 2001-2002 Chevrolet and GMC truck and van applications.

Quality Assurance

Dorman OE FIX parts are built to address known failure points in original equipment designs. Part number 977-809 uses Sensor Shield technology and a proprietary shaft seal to help reduce repeat contamination-related throttle body failures.