Execution order
1. Connect to the pneumatic drive (see Fig. Carburetor parts 2E2) vacuum gauge and vacuum pump and create a vacuum of 50 mbar in the pneumatic drive. If it does not drop within 2 minutes, the pneumatic drive is sealed.
2. Fully open the throttle valve of the first chamber, maintaining a vacuum of 50 mbar in the pneumatic drive of the throttle valve of the second chamber. The throttle valve of the second chamber should open fully. If the throttle valve of the second chamber does not open or does not open fully, then the pneumatic drive of the valve is faulty and must be replaced.
[This publication is borrowed from the resource audimanual.ru]