Exhaust Gas Recirculation (EGR) System Components

1. Remove the EGR valve and check it for sticking and excess carbon deposits.
2. Connect a manual vacuum pump to the EGR valve, Fig. 39.
3. Apply a vacuum of 67 kPa (20 in. Hg) and verify that that the diaphragm chamber is air tight.
4. Apply 7 kPa (2 in. Hg) of vacuum to the EGR valve and verify that air will not pass through the valve.
5. Increase the vacuum applied to 23 kPa (7 in. Hg) and verify that air will pass through the EGR valve.
6. After testing or replacing the EGR valve replace the gasket and tighten the mounting bolts to 19-28 Nm (14-20 ft. lbs.).