Emission Hose Routing Diagram

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Exhaust Gas Recirculation (EGR) Vacuum Control System

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
1	EGR Vacuum Sensor
2	EGR Throttle Valve Vacuum Control Solenoid
3	EGR Throttle Valve Diaphragm
4	EGR Valve Vacuum Control Solenoid
5	EGR Vacuum Vent Solenoid
6	EGR Valve Diaphragm
7	Vacuum Pump