EGR Valve

EGR valve should be checked at 12, 000 mile intervals. With engine at normal operating temperature, connect a tachometer and note idle RPM. Disconnect vacuum hose at intake manifold that goes to air cleaner. Disconnect vacuum hose for EGR valve and connect it to intake manifold where air cleaner vacuum hose was connected. Engine speed should now decrease between 100-240 RPM from previously noted RPM. If RPM decrease is less than 100 RPM, remove EGR valve and fitting on intake manifold. Clean as described in Maintenance. Reconnect both vacuum hoses to their proper places.