What are the symptoms of a damaged exhaust check valve?
2 Answers
When the exhaust check valve is damaged, symptoms such as the engine warning light illuminating, difficulty starting, engine shaking, unstable idle, weak acceleration, and failure to meet emission standards may occur. Below is an introduction to the impacts of a damaged exhaust check valve: 1. After the exhaust valve is damaged, it cannot control the amount of exhaust gas recirculation. Excessive exhaust gas participating in recirculation will affect the ignition and performance of the air-fuel mixture, thereby impacting the engine's power, especially during idle, low speed, light load, and when the engine is cold. The recirculated exhaust gas will significantly affect engine performance. 2. A damaged exhaust valve can lead to the car burning oil, with severe blue smoke from the tailpipe.
Last time my car had a problem, it was shaking at idle, with the RPM fluctuating up and down like it was dancing. When I stepped on the gas pedal to accelerate, there was no response—it felt weak and sluggish. Fuel consumption skyrocketed; the same tank of gas that used to cover intercity distances now fell short by dozens of kilometers, and the fuel gauge dropped rapidly. The check engine light kept flickering on and off, which made me really nervous. After searching online, I found out it might be due to a faulty exhaust check valve, which was messing up the exhaust gas recirculation system and causing irregular pressure inside the engine. The mechanic later told me that simply replacing the part would fix it, but if left unattended, the exhaust gases could contaminate the catalytic converter, doubling the repair costs. I replaced it immediately, and now the car runs much smoother—saving me money and giving me peace of mind.
