Disconnect the hose going to the auxiliary air supply valve from the intake manifold.
Connect the tachometer according to the instruction manual.
Start the engine and leave it to idle.
Close the opening of the hose leading to the auxiliary air supply valve. The engine speed should then decrease.
Connect the hose to the intake manifold, connect the block to the auxiliary air supply valve and warm up the engine.
Disconnect the hose leading to the additional air supply valve from the inlet pipe again and close its opening. In this case, the engine speed should not change. If the engine mode changes, replace the auxiliary air valve.
The principle of operation of the valve for additional air supply: 1 - block; 2 - thermal winding; 3 - bimetallic spring; 4 - rotary damper.
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