What are the effects of a faulty exhaust valve in the BYD F3?
2 Answers
Here are the impacts of a damaged exhaust valve: 1. When 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 under these conditions. 2. A damaged exhaust valve can cause the car to burn oil, resulting in severe blue smoke from the exhaust. This is because the exhaust valve also functions as an oil-gas separator. When working properly, it only draws in exhaust gas without sucking in oil. If the exhaust valve is damaged and loses its oil-gas separation function, it will draw in oil along with the gas, allowing oil to enter the intake manifold and combustion chamber, leading to oil burning and severe blue smoke from the exhaust.
Last time my F3's PCV valve failed and it was a nightmare. While driving, I suddenly noticed fuel consumption skyrocketing - a full tank would last 100km less. The scariest part was the blue smoke constantly pouring from the exhaust pipe, with cars behind honking at traffic lights. The mechanic later explained it was engine oil being burned. At idle, the engine shook like it was dancing, and the check engine light came on. After replacing the valve, the technician also found the throttle body coated with oil sludge - only after cleaning did everything return to normal. I'd suggest checking this component immediately if you notice abnormal oil consumption or blue smoke. A genuine replacement part only costs a few hundred yuan.
