EGR Valve

Disconnect hose from EGR valve and connect vacuum pump to valve. Apply 3.3-4.9 in. Hg, the diaphragm should start to move. Apply vacuum until 15.7-17.3 in. Hg is reached. Diaphragm should move smoothly until it reaches its end of travel. If EGR valve is seized, remove it and clean. If diaphragm is punctured, replace EGR valve.