EGR Valve: Testing and Inspection

1. Remove the Exhaust Gas Recirculation (EGR) valve and check it for sticking or carbon deposits. If found, clean with a suitable solvent so that the valve seats correctly.
2. Connect a hand vacuum pump to the EGR valve.
3. Apply 500mm Hg (20 in. Hg) vacuum, and check to be sure that vacuum is maintained.
4. Apply a vacuum and check the function of the valve by blowing air through one side of the EGR passage.

Vacuum Passage of air

40 mm Hg (1.6 in Hg) or less Air is not blown out
200 mm Hg (7.9 in. Hg) or more Air is blown out