EGR Valve: Testing and Inspection

EGR Control Valve Testing:

1. Run engine at idle.
2. Connect vacuum pump to valve and apply vacuum of 1.6 - 3.5 in Hg (40 - 90 mm Hg).
3. Verify that engine runs rough or stalls. If not as specified, replace valve if no other problems (such as clogged passages) are detected.