EGR Valve: Testing and Inspection

INSPECTION
1. With engine at normal operating temperature (cooling fan comes on) and at normal idle speed, disconnect vacuum hose from the Exhaust Gas Recirculation (EGR) valve and connect a vacuum pump/gauge to measure vacuum at the hose. There should be no vacuum.
2. Disconnect vacuum pump/gauge from vacuum hose and connect it to the EGR Valve. Apply 8 in. hg. of vacuum to the EGR Valve.
3. The engine should stall or run rough. The valve should hold vacuum. If not:
^ Remove EGR Valve and inspect EGR port for blockage.
^ Replace EGR Valve if ports are clear.