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What are the methods to determine if the exhaust gas valve is damaged?

2 Answers

DeGemma

07/24/25 4:25am

Here are specific symptoms of a damaged exhaust gas valve: 1. Affects engine performance: After the exhaust gas valve is damaged, it cannot control the amount of exhaust gas recirculation. Excessive exhaust gas participating in recirculation will affect the concentration of the air-fuel mixture, leading to difficulties in starting, engine shaking, unstable idling, weak acceleration, and other phenomena that affect engine performance. 2. Burning oil and emitting blue smoke: A damaged exhaust gas valve can cause the car to burn oil, with blue smoke coming from the exhaust pipe. The exhaust gas valve serves the function of oil-gas separation. When working normally, it only draws in exhaust gas and not oil. If the exhaust gas valve is damaged, it loses its oil-gas separation function, potentially drawing in oil while inhaling, allowing oil to enter the combustion chamber, resulting in burning oil and emitting blue smoke.

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LenaLee

08/11/25 12:01am

My previous car had the exhaust gas recirculation (EGR) valve fail several times, which was quite troublesome. First, the engine warning light would come on, indicating a potential issue. The car would shake noticeably at idle, like sitting on a massage chair, and it became even more pronounced when the air conditioning was turned on. Acceleration felt sluggish, the RPM wouldn't climb properly, and fuel consumption would spike. For a manual check, you could open the hood and listen for any hissing sounds indicating a leak, or disconnect the vacuum hose to see if the situation improves. If you have a diagnostic tool, scanning for trouble codes would usually reveal a P040x code, which pretty much confirms the issue. I recommend not delaying repairs—small problems can escalate and damage the engine. It's safer and more cost-effective to get a professional inspection at a repair shop.

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