EGR Valve

Start and run engine at 2000-2500 RPM. Valve stem should move upward. As engine returns to idle, valve should return to closed position. Detach vacuum hose from EGR valve. Connect a hand-held vacuum pump to valve and apply 8 in. Hg of vacuum. Vacuum should not leak down. While applying vacuum, observe movement of valve stem. At 8 in. Hg, stem should move to full open position. If valve does not respond as indicated, it must be replaced.