What are the symptoms of EGR valve failure?
3 Answers
When the EGR valve is damaged, symptoms may include extremely unstable idle speed or even stalling, malfunction indicator light flashing, failure to meet annual emission inspection standards, engine oil burning, and blue smoke from the exhaust. Here are some details about the EGR valve: 1. The EGR valve is part of the exhaust gas recirculation system. If the EGR valve remains constantly open, the vehicle may exhibit black smoke emission, poor acceleration, and increased fuel consumption. If the EGR valve remains constantly closed, it can affect the vehicle's exhaust emissions, potentially causing failure in annual inspections. 2. The function of the exhaust gas recirculation valve is to appropriately reduce fuel consumption, improve engine efficiency, lower exhaust temperature, and decrease the formation of nitrogen oxide compounds and carbon monoxide.
If you feel something seriously wrong while driving, a faulty EGR could be the major culprit. My car exhibited symptoms several times—unstable engine idling, the whole body shaking at red lights as if it might stall any moment. There was a noticeable lack of power during acceleration, with delayed response to pressing the gas pedal, especially struggling uphill. Fuel consumption also skyrocketed, jumping from 7 liters per 100 km to nearly 10, adding hundreds to monthly fuel costs. The check engine light frequently came on, signaling an exhaust gas recirculation issue. Driving long-term with this not only affects comfort but also leads to excessive emissions, harming the environment. After repairs, I found the valve stuck due to carbon buildup; replacing the part restored normal operation. It's best to check at the first sign of trouble to prevent more severe damage.
As an experienced driver, I've seen all kinds of signs of EGR failure. Engine shaking is a clear indicator, especially noticeable during cold starts, with vibrations strong enough to shake the steering wheel at idle; acceleration lag, where the car responds sluggishly when you step on the gas; a significant increase in fuel consumption, 15% to 20% more than normal, wasting money in the long run; exhaust may emit black smoke or unusual odors, failing to meet emission standards; sometimes the dashboard check light doesn't come on, but the overall feeling is lack of power. The core issue is valve clogging or damage, leading to poor exhaust gas recirculation and affecting combustion efficiency. Regular cleaning of the throttle body and EGR-related components can prevent problems, and addressing issues early can avoid damage to other engine parts.
