Cold Engine System Test

Fig. 70 Checking Vacuum To The Purge Control Valve:

NOTE: The engine coolant temperature must be below 63°C (145°F).
1. Disconnect the #19 vacuum hose at the purge control valve, Fig. 70, and connect a vacuum gauge to the hose.
2. With the engine running at idle, there should be no vacuum.
3. If vacuum is available:
a. Check the routing of vacuum hose #19, and correct as necessary.
b. If the vacuum hose routing is correct, check the purge cut-off solenoid valve.
4. If no vacuum is available, perform the HOT ENGINE test.