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Check engine helium and helium by opening the cover of the oil port and slowly refueling. If helium is severe, it can be seen with the naked eye. If helium is not serious, you can use a blank sheet of paper about 5 cm away from the oil port, and then add oil. If helium and oyster sauce, there will be traces of oil on white paper, and the traces of oil will be severe. Check the exhaust color. The gas emitted by a normal gasoline engine during operation should be colorless. When the diesel engine is running with a load, the color of the exhaust gas is generally light gray, and when the load is slightly heavy, it may be dark gray. If the color of the exhaust gas is blue, it means that the engine oil enters the combustion chamber and the organic oil in the cylinder burns. If the oil surface is normal, it is a problem with the piston. The wear of the piston ring and the cylinder wall is too large. The clearance is too large or the air intake of the cylinder is not good, causing the oil to inhale into the combustion chamber. If the exhaust pipe is black smoke, the mixture is too rich and ignition occurs. Time out and other reasons.
The engine is called the heart of the car, especially the used car should pay more attention to checking the working condition of the engine.