EGR Valve Stem Does Not Move On System Test
- Check for cracked, leaking, disconnected or plugged vacuum. Replace any defective hoses.
- Connect an external vacuum source to EGR valve diaphragm. Apply at least 10 in. Hg to valve. If no valve movement occurs, Diaphragm is ruptured or stem is frozen. Replace EGR valve.
- If valve opens 1/8" (3 mm), pinch off supply hose to check for diaphragm leakage. Valve should remain open for at least 30 seconds. If leakage occurs, replace EGR valve.