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EGR Valve Stem Does Not Move On System Test

  1. Check for correct hose connections. Leak check to confirm all hoses are in good condition.
  2. Check EGR valve for ruptured diaphragm or frozen valve stem. Connect an external vacuum source of 10 in. Hg or greater to valve diaphragm. If no valve movement occurs, replace valve.
  3. 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.
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