Will a Damaged Exhaust Valve Cause the Air-Fuel Mixture to Be Too Rich or Too Lean?

[LeChloe]

A damaged exhaust valve will cause the air-fuel mixture to be too lean. The function of the car exhaust valve: It allows a portion of the exhaust gas to recirculate back into the cylinder for combustion. This small amount of exhaust gas reduces the temperature inside the cylinder during combustion. Since the air-fuel mixture is generated under high-temperature and oxygen-rich conditions, this process suppresses the formation of the mixture, thereby reducing the amount of exhaust emissions. Effects of a damaged exhaust valve: 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, thus impacting the engine's power output. This is particularly noticeable during engine idle, low-speed operation, light load, and cold starts, where the recirculated exhaust gas significantly affects engine performance.