What are the symptoms of a faulty exhaust valve in a car?
2 Answers
The symptoms of a faulty exhaust valve in a car are: 1. Difficulty starting the engine and weak acceleration; 2. Failing emission tests during annual inspections; 3. Black smoke coming 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 reasons for a faulty exhaust valve are: 1. Quality issues with the exhaust gas recirculation system itself; 2. Improper maintenance; 3. Poor 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 decrease the formation of nitrogen oxide compounds and carbon monoxide.
I once experienced severe engine shaking while driving, especially at low speeds, where the car vibrated like a sieve. Acceleration was also sluggish, with the gas pedal feeling mushy and the car responding slowly, while the tachometer needle kept jumping up and down erratically. The most annoying part was the constant illumination of the engine warning light on the dashboard, reminding me to get it checked. Fuel consumption also skyrocketed—normally, a full tank could last 500 kilometers, but now it barely reached 400 before running low, costing me much more on gas. There was also a strange burnt smell in the car, particularly after cold starts, resembling melted plastic. A visit to the repair shop revealed a clogged exhaust gas recirculation (EGR) valve, causing poor exhaust flow and reduced combustion efficiency. Delaying repairs could lead to more serious issues, such as engine overheating or excessive emissions, which are quite dangerous. If you notice these symptoms, don’t wait—get it checked by a professional immediately.
