EGR Valve Check
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 Mitsubishi Montero Sport, 2002 Mitsubishi Montero, 2002 Mitsubishi Mirage, 2002 Mitsubishi Lancer, and 2002 Mitsubishi Galant. However, it is still accessible from the selected car via links, so may be relevant.
Remove EGR valve and check for sticking, carbon deposits or other debris. Clean with suitable solvent as necessary and ensure valve seats properly. Using a vacuum pump, apply 20 in. Hg (67 kPa) vacuum to EGR valve. Vacuum should hold. Apply 1.6 in. Hg (5 kPa) vacuum or less and blow into one EGR port. Air should not blow out of other port. Apply 8.7 in. Hg (29 kPa) vacuum or more and blow into one EGR port. Air should blow out of other port. If EGR valve does not test as specified, replace EGR valve.