What are the symptoms of car valve problems?
2 Answers
When car valves have problems, symptoms may include driving vibration, unstable engine operation, difficulty starting, black smoke from the exhaust pipe, increased fuel consumption, and in severe cases, abnormal engine noises, illuminated fault lights indicating misfire faults, and other phenomena. When these symptoms appear, a fault diagnostic tool can be used to determine the specific position of the throttle valve and observe the data stream display. If the throttle opening is found to be too large, it should be cleaned. If the throttle valve's fault is permanent, the entire assembly usually needs to be replaced as it generally cannot be disassembled for repair. Cleaning should be done with moderation, as excessive cleaning can lead to premature failure of the throttle valve, gradually removing the special coating inside the throttle chamber, causing oil sludge buildup and creating a vicious cycle.
I remember one time when the car's engine started running unevenly, shaking at idle like it was about to fall apart. The throttle response felt weaker than before, with noticeably reduced power, and acceleration became particularly laborious. I also heard a ticking sound under the hood, especially noticeable during cold starts, resembling a metallic knocking noise. On the highway, fuel consumption suddenly increased significantly—normally a full tank could last 500 kilometers, but now it only reached around 450. When I took it to the repair shop, the mechanic said it might be due to valve seal issues or improper clearance adjustment, leading to incomplete combustion. These symptoms shouldn’t be ignored, as they could potentially cause severe engine damage. It’s best to get it checked early to avoid bigger problems down the road.
