GMC 19210662 Valve Kit,EGR

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1996 and later models use an electronically operated EGR valve. You must have these units checked by a dealer service department or other shop with the proper type scan tool that can operate the EGR valve electronically for testing. The EGR valve is usually located on the intake manifold, adjacent to the TBI unit. Most of the time when a problem develops in this emissions system, it's due to a stuck or corroded EGR valve. With the engine cold to prevent burns, push on the EGR valve diaphragm. Using moderate pressure, you should be able to press the diaphragm in-and-out within the housing. The EGA valve diaphragm should move easily with finger pressure. If the diaphragm doesn't move or moves only with much effort, replace the EGR valve with a new one. If in doubt about the condition of the valve, compare the free movement of your EGR valve with a new valve. Some vehicles are equipped with an electronic Vacuum Regulator Valve (VRV). The filter in this valve should be cleaned at regular intervals. The valve is located on a bracket near the EGR valve. Locate the valve and remove the old filter. Clean the filter with a soapy solution and reinstall it. For more information on the EGR system, look for more information.

In early models, the EGR system includes an EGR valve, an EGR solenoid valve, and the Electronic Control Module (ECM). The ECM signals the EGR solenoid valve to open under specific conditions, allowing intake manifold vacuum to reach the EGR valve, which then opens, permitting exhaust gas flow into the intake manifold.

The most common cause of problems in the EGR system is a stuck or corroded EGR valve.

If there are issues with the EGR system in early models, ECM inspection should be performed by a dealer service department due to its complexity and interconnectedness with other vehicle systems. Additionally, inspection of vacuum hoses is crucial, and damaged or misrouted hoses should be replaced.