Dorman 977-689 Fuel Injection Throttle Body

Dorman 977-689 Electronic Throttle Body

This Dorman electronic throttle body is built for Porsche applications that need a direct replacement for throttle response and idle control issues. It uses a non-contact Hall effect sensor and a proprietary Sensor Shield butterfly shaft seal to help reduce the moisture and oil intrusion that can lead to internal electronic failure.

Compatible with select Porsche Boxster, Cayman, Cayenne, and 911 models, Dorman 977-689 is an OE FIX-style replacement for gas fuel systems with electronic throttle control.

Key Features

• Electronic throttle body for gas fuel systems
• Non-contact Hall effect sensor for reduced wear
• Proprietary Sensor Shield butterfly shaft seal
• Aluminum housing with natural finish
• 6-terminal male electrical connection
• Throttle position sensor included
• Gasket included
• Flanged inlet design with 74 mm bore diameter

Detailed Description

Dorman 977-689 is an electronic fuel injection throttle body engineered as a direct-fit replacement for vehicles that use electronic throttle control. The aluminum and PBT housing is designed for the demands of modern engine management, while the Hall effect sensor eliminates the contact-style wear points found in many original throttle bodies. The Sensor Shield shaft seal adds another layer of protection against contamination that can affect throttle operation over time. This part cross-references Bosch 0280750474 for the same application. It is a practical replacement choice for Porsche Boxster, Cayman, Cayenne, and 911 models where throttle body failure can trigger drivability concerns.

Common Issues This Part Can Address

• Throttle response problems caused by internal sensor wear
• Idle instability related to throttle body contamination
• Electronic throttle faults from moisture intrusion
• Oil-related buildup affecting throttle plate movement
• Check engine lights tied to throttle position signal errors

Installation Notes and Tips

Verify connector style, inlet diameter, and bore size before installation. This throttle body includes a gasket, but mounting hardware is not included. Clean the intake mating surface thoroughly and inspect the throttle body connector and wiring for corrosion or damage before fitting the replacement. After installation, follow the vehicle-specific throttle relearn or adaptation procedure if required by the engine control system.

Quality Assurance

Dorman OE FIX components are built to address common failure points found in original equipment parts by updating the design where possible. Part number 977-689 follows that approach with a non-contact sensor and improved shaft sealing for long-term service in Porsche electronic throttle applications.