What are the symptoms of a clogged exhaust valve?

[McAthena]

Car exhaust valve failure can lead to issues such as incomplete closure of the exhaust gas recirculation valve and flashing of the malfunction indicator light. The function of the exhaust valve: The role of the car exhaust valve is to allow exhaust gases to be recirculated into the cylinder for combustion. This small amount of exhaust gas reduces the temperature in the cylinder during combustion. Since NOX is generated under high-temperature and oxygen-rich conditions, it inhibits the formation of NOX, thereby reducing the NOX content in the exhaust gases. Effects of a damaged exhaust valve: 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 engine idling, low speed, light load, and when the engine is cold, where the recirculated exhaust gas will significantly affect engine performance.

[LaSkylar]

A clogged PCV valve is no small matter. I've seen too many cars develop problems because of this, especially those with unstable idling that shake like a sieve, particularly when stopped at traffic lights where the entire cabin trembles. Acceleration feels sluggish, with little response when you press the throttle, and fuel consumption skyrockets, making driving particularly uncomfortable. The check engine light coming on is also a signal - when this thing gets clogged, it affects exhaust gas recirculation, leading to incomplete combustion, engine overheating, or even backfiring. In severe cases, it can shorten engine lifespan. Drivers should pay attention to these abnormalities and get checked early to avoid bigger troubles. Regular carbon deposit cleaning can prevent this, and I recommend car owners develop good maintenance habits.

[LeEverett]

My car had a clogged PCV valve before, and it felt really off at the time. After starting, the idle was shaky non-stop, even the seat vibrated. On the road, acceleration was sluggish, like something was holding it back, and fuel consumption increased noticeably, costing me more than usual. The check engine light kept flashing to alert me of the issue. Later, inspection showed the valve was completely clogged with carbon deposits. After the repair, the car ran much smoother. This kind of blockage prevents proper exhaust gas recirculation, making the engine work inefficiently, which not only affects driving experience but also increases maintenance costs. I make it a habit to perform regular maintenance to avoid such troubles—after all, better safe than sorry.

[ONathan]

A clogged PCV valve can cause strange car behavior, such as severe engine shaking at idle and weak acceleration. The check engine light serves as a warning, and in severe cases, fuel consumption increases, making the car run roughly. The blockage is usually due to excessive carbon buildup, preventing proper exhaust gas recirculation, which can harm engine health over time. Simply put, if you notice these symptoms, get it fixed promptly.