Examination
1. If the engine does not work or runs unsteadily at idle, it is possible that due to a leak in the diaphragm, the economizer valve is completely or partially blocking the fuel supply. To check the vacuum supply hose (from the inlet pipe to the solenoid valve) connect to the economizer nipple. Start the engine. If the engine starts to work steadily, the economizer valve is working properly. If not, its diaphragm is damaged (or the hose itself is not sealed).
2. The economizer valve may get stuck in the open position and not shut off the fuel supply (in this case, increased fuel consumption is observed). In this case, the engine runs steadily at idle speed. To check the valve, we start the engine and in idle mode, disconnect one of the wires from the terminals of the electromagnetic valve (see "Electro-pneumatic valve - check and replacement"). If the engine continues to run, the economizer diaphragm may not be sealed (or the solenoid valve is faulty). To check, remove (see below) and inspect the diaphragm; if there are any breaks or cracks, replace it.
Replacement
The economizer diaphragm can be replaced without removing the carburetor. For clarity, we show the work on a removed carburetor.
1. Disconnect the hose connecting the economizer to the solenoid valve and the wire blocks from the microswitch terminals (see "Carburetor - removal and installation").
2. Using a Phillips screwdriver, unscrew the two screws securing the microswitch and economizer bracket.
Information taken from the website VazBook.ru
3. Remove the microswitch bracket and extract the economizer from the throttle body.
4. Remove the gasket installed between the economizer and the housing and check its condition. If the gasket is damaged, replace it.
5. Using a Phillips screwdriver, unscrew the two screws securing the economizer cover.
6. Remove the economizer cover.
7. Check the condition of the diaphragm. If there are any breaks or cracks, replace the diaphragm. If the connection between the diaphragm and the needle is not separable, replace the economizer as a whole.
Installation
1. Installation of all removed parts is carried out in reverse order.
2. After installing the economizer, adjust the idle speed (see "Idle speed - adjustment").