What are the symptoms of a faulty EGR valve?

[Janice]

Here are the symptoms of a faulty EGR valve: 1. The vehicle emits black smoke and experiences weak acceleration; 2. Unstable idle speed; 3. Increased fuel consumption; 4. Insufficient power. The reasons for EGR valve failure are as follows: 1. Quality issues with the exhaust gas recirculation system itself; 2. Improper maintenance; 3. Aging of the exhaust valve; 4. Issues with fuel quality. Additional information: The EGR valve, or Exhaust Gas Recirculation valve, is a mechatronic product installed on gasoline engines to control the amount of exhaust gas recirculated back into the intake system. The function of the exhaust valve is to appropriately reduce fuel consumption, improve engine efficiency, lower exhaust temperature, and decrease the generation of nitrogen oxide compounds and carbon monoxide.