The solenoid valve of the carburettor is an integral part of an economizer of forced idling. The electromagnetic valve is the executive element of the economizer. The locking needle of the electromagnetic valve (usually made of plastic) blocks the fuel feed through the idle carburettor, helping to save fuel. The operation of the electromagnetic valve is in charge of a simple electronic control unit.
Following the replacement of the electromagnetic valve of the carburetor, many encounter an errant idling. The most likely cause is a weak or strained valve. A weak shut-off valve results in a threaded air pump, and a outstretched valve could cause damage to the carburettor and the valve itself, which would also result in an air pump. The valve needs to be tightened up to 4 Nm at a time. In order to adjust the idle speed, a valve may have a slight twist, but not more than 120 degrees, on the valve engine.
Also, the instability of idle speed may be caused by the appearance of bullies on the plastic needle of the electromagnetic valve. If the needle is in order, it's worth checking if the idle gidler is full.
