Cold Engine System Test
COLD ENGINENOTE: Engine coolant temperature must be below thermovalve A set temperature (55°C, 131°F).
1. Disconnect the #19 vacuum hose at purge control diaphragm valve and connect vacuum pump/gauge to the hose.
2. Start the engine and allow to idle.
Vacuum should not be available.
- If there is no vacuum, disconnect the vacuum gauge and reconnect hose.
- If there is vacuum, replace thermovalve A and re-test.
Carburetor Thermovalve
NOTE: Carburetor temperature must be below the carburetor thermovalve set temperature (30°C, 86°F).
1. Disconnect the hose at the carburetor thermovalve and connect a vacuum pump to the thermovalve.
2. Apply 200 mmHg (7.8 in Hg) vacuum to the thermovalve.
Vacuum should remain steady.
- If vacuum remains steady, the carburetor thermovalve is working properly. Remove the vacuum pump and reconnect the hose; test is complete.
- If vacuum does not remain steady, replace the carburetor thermovalve and re-test.