What are the symptoms of a faulty Wuling B12 check valve?

[StGraham]

The symptoms of a faulty Wuling B12 check valve are: excessive white or blue smoke from the exhaust pipe, accompanied by engine shaking and unstable idle. The maintenance methods for car engines are: 1. Regularly change the oil and oil filter; 2. Use lubricating oil of appropriate quality grade; 3. Regularly clean the radiator; 4. Regularly service the air filter, oil filter, and fuel filter; 5. Maintain good crankcase ventilation and clean it regularly; 6. Regularly clean the fuel system. The principles of engine operation are: 1. Mixing air and gasoline in a certain proportion to form a combustible mixture; 2. The intake stroke draws the mixture into the cylinder, where it is compressed, ignited, and burned to produce thermal energy; 3. The high-temperature and high-pressure gas acts on the top of the piston, driving the piston to perform reciprocating linear motion, which then outputs mechanical energy through the connecting rod, crankshaft, and flywheel mechanism.