Dorman 977-858 Fuel Injection Throttle Body

Overview of Dorman Fuel Injection Throttle Body 977-858

The Dorman 977-858 fuel injection throttle body is designed for reliable performance in Chevrolet Express 2500, Express 3500, GMC Savana 2500, and Savana 3500 models. Crafted from aluminum with a silver finish, this throttle body supports diesel fuel systems and features a 60mm bore diameter for optimal airflow.

• Compatible with Chevrolet Express 2500, Express 3500, GMC Savana 2500, and Savana 3500
• Constructed from durable aluminum with a silver finish
• 60mm inlet and outlet diameter with non-flanged connections
• Designed for diesel fuel system applications
• Airflow rate of 96 CFM for efficient engine performance
• Single outlet hose assembly included
• Does not include mounting hardware, gaskets, fuel injectors, or idle air control motor

Detailed Product Description

The Dorman 977-858 throttle body is engineered to meet the specific requirements of diesel-powered Chevrolet and GMC vans, including the Express and Savana series. Its aluminum construction ensures durability and resistance to corrosion, while the silver finish provides a clean, professional appearance. The throttle body features a 60mm bore diameter and matching inlet and outlet diameters, both non-flanged, facilitating straightforward integration with existing fuel injection systems. With an airflow rate of 96 cubic feet per minute, it supports efficient air and fuel delivery, contributing to consistent engine performance.

Applications and Problem Resolution

This throttle body is intended for use in the fuel injection system of diesel engines in select Chevrolet and GMC vans. It addresses several common issues, including:

• Throttle body wear causing poor throttle response
• Airflow restrictions leading to reduced engine efficiency
• Corrosion or damage to the original throttle body assembly
• Fuel delivery inconsistencies affecting engine idle and acceleration
• Replacement of faulty or malfunctioning throttle body components

Installation Notes and Tips

When installing the Dorman 977-858 throttle body, ensure the throttle body mounting surface is clean and free of debris. Since mounting hardware and gaskets are not included, use OEM or compatible parts to secure the assembly and maintain proper sealing. Verify all hose connections match the 60mm non-flanged inlet and outlet diameters. It is recommended to inspect related components such as fuel injectors and the idle air control motor during installation, as these are not included with this part.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM specifications, providing reliable performance for your vehicle. While specific warranty details for part number 977-858 are not provided here, Dorman typically offers limited warranties covering defects in material and workmanship. Consult the product packaging or Dorman’s official resources for exact warranty terms.