Cold Engine Test

Fig. 51 Checking For Vacuum To The EGR Valve:

NOTE: Coolant temperature must be below 63°C (145°F)

1. Disconnect the #16 vacuum hose from the EGR valve and connect a vacuum gauge to the hose, Fig. 51.
2. Start the engine and raise the speed above 3000 rpm. No vacuum should be available.
a. If vacuum is availble, check the purge cut-off solenoid valve [SEE TESTING PROCEDURES (PURGE CUT-OFF SOLENOID VALVE)].
b. If no vacuum is available, continue on with the HOT ENGINE test.