Carburetor Thermovalve Test

Carburetor Thermovalve
COLD Engine Test

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/gauge 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 retest.


Carburetor Thermovalve
HOT Engine Test

NOTE:
- Carburetor temperature must be above the carburetor thermovalve set temperature (40°C, 104°F).





1. Disconnect the hose at the carburetor thermovalve and connect a vacuum pump/gauge to the thermovalve.
2. Apply vacuum to the thermovalve.

The valve should not hold vacuum.

- If vacuum does not hold, the thermovalve is OK. Reconnect the hose to the valve.
- If vacuum is held, replace the thermovalve and retest.