EGR Valve
- Look through opening in EGR valve body. With engine at normal operating temperature, check that valve shaft moves when engine reaches 3000-3500 RPM under no-load condition.NOTE: On 2WD Federal models, engine must have been running 8 minutes or more before performing this test.
- If shaft does not move as specified, remove valve and manually check valve movement. If valve appears okay, check vacuum lines for leaks. If valve does not operate, clean or replace.