Exhaust Gas Recirculation: Testing and Inspection

Fig. 4 EGR Troubleshooting Chart (Part 1 Of 2):

Fig. 4 EGR Troubleshooting Chart (Part 2 Of 2):

Refer to Fig. 4, for troubleshooting charts.

1. With engine running and coolant temperature below 131°F (55°C), ensure EGR valve is not open by feeling diaphragm with finger.
2. Allow engine to reach normal operating temperature. Race engine and check that diaphragm moves toward 1, during acceleration and toward 2 during deceleration.