GM 3031520 Valve Asm

The EGA valve is located in the intake manifold beside the carburetor. Most times, a jammed or rusted EGA valve will be the cause of emissions system failure. To verify if it's functional, put your hand below EGA valve when the engine is cold to avoid burns and manually press down on diaphragm. The diaphragm should allow you to perform some modestly exerted up and down movement in its case. If it doesn't move at all or moves with great difficulty replace it with another one of EGA.

To check the EGA valve, reach under it with the engine cold and manually push on the diaphragm.

Maintenance primarily involves inspecting vacuum hoses and the EGR valve, with a Thermal Vacuum Switch (TVS) regulating vacuum signals based on engine temperature.

The most common cause of faults in the emissions system related to the EGA valve is a stuck or corroded valve.

Common problems associated with the EGR system include rough idling, stalling, and poor engine performance.

The EGR system operates based on throttle position and engine temperature, preventing recirculation during idle, deceleration, or cold starts to maintain the necessary air-fuel mixture.