What does EGR mean in cars?

[DiJoy]

egr valve, namely the exhaust gas recirculation valve, is a mechatronic product installed on gasoline engines to control the amount of exhaust gas recirculated back to the intake system. EGR in cars stands for Exhaust Gas Recirculation system, which refers to redirecting a portion of the engine's exhaust gases back to the intake manifold, where they mix with fresh air-fuel mixture before re-entering the cylinders. The function of the EGR valve is to reduce nitrogen oxide emissions in the exhaust. Symptoms of a faulty EGR valve include: 1. Difficulty starting the engine and poor acceleration; 2. Failing emission tests; 3. Black smoke from the exhaust pipe; 4. Unstable idle or stalling at idle; 5. Check engine light flashing; 6. Engine oil burning; 7. Increased fuel consumption. Causes of EGR valve failure: 1. Quality issues with the exhaust gas recirculation system itself; 2. Improper maintenance; 3. Poor fuel quality; 4. Aging of the valve.