Chevrolet 96068663 Valve,EGR Vacuum Regulator Valve Check

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The Exhaust Gas Recirculation (EGR) system reduces nitrogen oxides by recirculating exhaust gas into the intake manifold. The EGR valve, controlled by a modulator, adjusts based on load conditions. California fuel-injected vehicles also have a sub-EGR valve managed by a PCM-controlled Vacuum Switching Valve (VSV). To inspect the system, ensure the EGR valve diaphragm moves when the engine is cold and warm. Use a vacuum pump to test the valve if unresponsive. Examine hoses for damage and replace if needed. Test the EGR modulator and BVSV for vacuum retention. Check the TWSV or VSV for airflow. For 1999+ models, verify the EGR valve's resistance. To replace, disconnect and remove the old component, clean surfaces, and install the new part.

On earlier models, you can check the operation of the EGR valve by pushing on the diaphragm with moderate pressure. It should move smoothly within the housing.