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.

[FaithAnn]

EGR in cars stands for Exhaust Gas Recirculation system, which plays a crucial role in the engine. Simply put, it recirculates a portion of exhaust gases from the tailpipe, mixes them with fresh air, and reintroduces them into the combustion chamber. This helps lower combustion temperatures and reduces nitrogen oxide emissions. With strict environmental regulations nowadays, vehicles can't pass annual inspections without this system. I personally pay close attention to this—if the EGR malfunctions, such as a clogged valve, the car may experience unstable idling, severe shaking, or even a significant increase in fuel consumption. During maintenance, cleaning the valve body is quite simple and costs little. When driving, keeping an eye on your car's condition and scheduling regular maintenance can save a lot of hassle. Don’t underestimate this system—it’s vital for maintaining your car’s environmental performance. With urban driving contributing heavily to pollution, maintaining the EGR properly is a way to do your part for cleaner air.

[CollinAnn]

Speaking of EGR, I've personally experienced its troubles. That time my car kept shaking when starting and lacked power during acceleration. The mechanic found severe carbon buildup in the EGR valve. This system recirculates exhaust gases back to the intake side, aiming to reduce combustion temperature and harmful emissions. But if the valve gets clogged or damaged, engine problems can occur, like black smoke or decreased fuel efficiency. I now clean the EGR every six months - it's low cost but prevents more serious failures. In most vehicles, EGR is standard equipment helping reduce nitrogen oxides, which is why it's specifically checked during annual inspections. Neglecting it can lead to excessive emissions and even damage engine components. In short, proper maintenance is an essential habit for every driver.

[Kenneth]

Automotive EGR refers to the Exhaust Gas Recirculation system. Its working principle involves redirecting a portion of engine exhaust gases into the intake manifold, where it mixes with fresh air to lower combustion temperatures, thereby controlling nitrogen oxide emissions. This is a common emission reduction technology in modern vehicles. The system typically includes valves and piping, which are prone to malfunctions due to carbon buildup. When functioning properly, it benefits both environmental protection and engine longevity; however, if problems arise, the vehicle may experience starting difficulties or power loss. Regular cleaning during maintenance can prevent most issues.