How to Determine if the EGR Valve is Faulty?
1 Answers
Methods to determine if the EGR valve is faulty: The exhaust gas recirculation valve does not close tightly, and the fault light flashes; when a cylinder is cut off, the engine speed does not decrease but instead increases. The reason for this phenomenon: When the cylinder connected to the exhaust gas recirculation pipeline in the exhaust manifold is working, the exhaust gas entering the intake manifold through the EGR valve is the combustion exhaust gas from that cylinder. These exhaust gases dilute the air-fuel mixture under idle conditions, causing the engine to operate abnormally. The working principle of the EGR valve: The high-pressure gas from the compressor enters the EGR valve and then the guide vanes of the valve, flowing in a spiral pattern along the vanes. The lubricating oil is separated from the working gas by centrifugal force and gravity, flowing down along the inner wall of the cylinder, while the working gas is discharged from the center pipe of the EGR valve through the multi-baffle plate.