What sound does a faulty exhaust valve make?

[KalebRose]

Exhaust valve failure will produce a whistling sound. When the exhaust 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, and the car may experience difficulties in starting, engine shaking, unstable idle speed, and weak acceleration, affecting engine performance. The following is relevant information about the car exhaust valve: 1. Function: The car exhaust valve allows exhaust gas to re-enter the cylinder for combustion. This small amount of exhaust gas reduces the temperature in the cylinder during combustion. Since nitrogen oxides are generated under high-temperature and oxygen-rich conditions, this inhibits the formation of nitrogen oxides, thereby reducing the NOX content in the exhaust gas. 2. Causes of damage: Quality issues with the exhaust valve itself; improper maintenance; fuel quality problems; the exhaust valve operates at high engine temperatures, and over time, it will age like the valve cover gasket and rubber rings.