Violations in the operation of the carburetor during the operation of the car are most often associated with clogging of its channels (calibrated holes of small diameter and fuel jets), as well as with the deposition of resins in them. We eliminate such a malfunction by washing the jets and internal cavities of the carburetor with acetone and blowing them with compressed air at a pressure of at least 4 kgf / cm2.
Violation of the tightness of the carburetor channels leads to incorrect operation or complete malfunction of the idle system, the second chamber damper drive and its other systems and devices. Causes of malfunction: damage to gaskets, sealing rubber rings; loosening of fasteners; deformation of the cover and the lower plane of the carburetor body (the result of tightening the nuts and screws of their fastening); damage to the diaphragms of the throttle valve drive of the second chamber, starting device and accelerator pump).
Part of the malfunctions can be caused by wear of individual elements of the carburetor, for example, a needle valve with a seat.
For example, the repair of the carburetor as a whole is shown here. In practice, it is enough to perform only a part of these operations in order to eliminate specific malfunctions. Some of them can be done by car (see Design Description).
Checking and replacing the idle system solenoid valve is described in the section Replacement of the electromagnetic valve of system of idling.