What Are the Effects of a Faulty Exhaust Valve?
2 Answers
Effects of a faulty exhaust valve include: 1. Difficulty starting the engine and weak acceleration; 2. Failure to meet emission standards during annual inspections; 3. Black smoke from the vehicle's exhaust pipe; 4. Unstable idle or stalling at idle; 5. Flashing check engine light; 6. Burning of engine oil; 7. Increased fuel consumption. The causes of a faulty exhaust valve are: 1. Quality issues with the exhaust gas recirculation system itself; 2. Improper maintenance; 3. Issues with fuel quality; 4. Aging of the exhaust valve. The function of the exhaust valve is to appropriately reduce fuel consumption, improve engine efficiency, lower exhaust temperature, and reduce the formation of nitrogen oxides and carbon monoxide.
Recently, the PCV valve in my car failed, leading to a series of issues. First, the engine shook violently at idle, making the whole car vibrate uncomfortably while driving. Then, fuel consumption skyrocketed—previously, a full tank could last 500 kilometers, but now it barely reaches 400. Additionally, blue smoke started coming from the exhaust pipe with a strong, unpleasant odor, raising concerns about environmental harm. At the repair shop, the mechanic diagnosed a clogged PCV valve, which is responsible for recirculating oil vapors. When faulty, it causes oil buildup, forming sludge that can wear out seals or even damage the engine over time. After spending a few dozen dollars on a replacement valve, everything returned to normal. I recommend regularly checking this small component, especially in older cars—it can save fuel costs, repair expenses, and reduce pollution.
