How to Determine if the Exhaust Gas Recirculation (EGR) Valve is Faulty?

[VanGrace]

Methods to determine if the EGR valve is faulty are as follows: When the EGR valve is damaged, it cannot control the amount of exhaust gas recirculation: Excessive exhaust gas participating in recirculation will affect the ignition and performance of the air-fuel mixture, thereby impacting the engine's power output. Especially during engine idling, low-speed operation, small load conditions, and when the engine is cold, the recirculated exhaust gas will significantly affect engine performance, leading to engine warning alerts. Oil burning: A damaged EGR valve can cause the car to burn oil, resulting in severe blue smoke from the exhaust. The reason is that the EGR valve also functions as an oil-gas separator. When working properly, it only draws in exhaust gas and not oil. If the EGR valve is damaged and loses its oil-gas separation function, it will draw in oil along with the air, allowing oil to enter the intake manifold and combustion chamber, causing oil burning and severe blue smoke from the exhaust.