EGR Valve Stem Does Not Move On System Test
- Check for correct hose connections. Leak check to confirm all hoses are in good condition.
- Check EGR valve for ruptured diaphragm or frozen valve stem. Connect external vacuum source of 10 in. Hg or greater to valve diaphragm. If no valve movement occurs, replace valve.
- If valve opens 1/8" (3 mm), pinch off supply hose to check for diaphragm leakage. Valve should remain open 30 seconds or longer. If leakage occurs, replace valve.