What is the method to judge the damage of waste gas valve?

The methods to judge the damage of waste gas valve are: 1, open the oil filler and check whether there is slight inhalation with paper; 2. Unscrew the screw of the clamp at the throttle valve door, and wipe the caliper with a paper towel for later use; 3. Press the throttle valve and open the throttle valve; 4. Use the dipstick to probe into the hole below, and observe whether there is oil on the dipstick after taking it out. If there is oil, it is damaged. Waste gas valve, also known as oil-gas separator and pressure control valve, is installed between compressor outlet and condenser inlet. By separating oil and gas, the heat transfer effect in condenser and evaporator is improved. Its function is to make the automobile exhaust gas circulate into the cylinder for combustion again, so that a small amount of exhaust gas can reduce the temperature of the cylinder and the NOX content in the exhaust gas during combustion.