Valve Inspection

Caution: If the EGR valve is hot, wear gloves in order to prevent personal injury.

Tools Required
J 23738-A Hand Vacuum Pump
1. Start the engine.
2. Run the engine to normal operating temperature.
3. Place one finger on the exhaust gas recirculation (EGR) valve diaphragm and accelerate the engine. The diaphragm (2) should move.
4. Disconnect the vacuum hose from the EGR valve.
5. Using a hand vacuum pump, apply 27 kPa (8 in. Hg) of vacuum to the EGR valve with one finger on the diaphragm. The diaphragm should move and the engine should run rough and the engine may stall.
6. Check for carbon deposits in the valve which may cause a restriction in flow. The restriction may be small enough so that the engine may not stall during step 5, yet large enough to cause a DTC to set. Check the EGR pressure transducer if the valve passes the above test. Replace the EGR valve if it fails the above test.