EGR Valve

Fig. 130 Testing the EGR valve:

1. Remove the EGR valve and inspect it for sticking, carbon deposits, etc.
2. Connect a hand vacuum pump to the EGR valve, Fig. 130.
3. Apply a vacuum of 67 kPa (20 in. Hg) and verify that the EGR valve diaphragm chamber is air tight.
4. Decrease the vacuum applied to 23 kPa (7 in. Hg) and verify that air passes through the EGR valve.
5. Decrease the vacuum applied to the EGR valve to 8 kPa (3 in. Hg) and verify that air will not pass through the EGR valve.