What are the symptoms of a faulty vehicle high-voltage line?
4 Answers
The symptoms of a faulty vehicle high-voltage line are: 1. The spark released by the spark plug will appear dark yellow and lack sufficient energy, making it difficult to effectively ignite the air-fuel mixture; 2. The spark plug electrodes may fail to release sparks, preventing the air-fuel mixture from burning and resulting in engine misfire. Engine misfire leads to reduced power, increased fuel consumption, and noticeable vibration and noise. Prolonged fuel injection without ignition in the engine cylinder can also cause gasoline flooding. Symptoms of ignition coil failure: 1. At idle, the vehicle body shakes noticeably; 2. While driving, when the engine speed is below 2500 RPM, the vehicle body exhibits significant shaking and weak acceleration; the shaking sensation disappears once the speed exceeds 2500 RPM. 3. Upon opening the engine hood and observing the running engine, noticeable engine vibration can be detected.
What troubles me most about a faulty high-voltage line in the car is that it becomes extremely difficult to start, especially during cold mornings when it takes multiple attempts to fire up. After starting, the engine constantly shakes, making the whole car vibrate like a tiny massager on the driver's seat—utterly annoying. During acceleration, there's a complete lack of power, with delayed throttle response that makes overtaking a struggle, while fuel consumption keeps climbing. Once, while driving in the rain with a damaged high-voltage line, the situation worsened—the engine sound became uneven, and I nearly broke down midway. I recommend checking promptly if these symptoms appear. Don't wait until the spark plugs get damaged like I did—it's both costly and dangerous. During routine maintenance, periodically inspect the wiring harness for signs of aging.
The most obvious symptom of a faulty high-voltage line is that the car's engine is particularly difficult to start, making every ignition attempt nerve-wracking. While driving, the car constantly shakes as if it's dancing disco, which is very uncomfortable. During acceleration, there's a severe lack of power—stepping on the gas pedal yields little response, making it feel like climbing a hill. Fuel consumption also increases significantly, causing a protest from the wallet. I only learned during my last repair that this condition worsens on humid days due to moisture causing electrical shorts. I suggest drivers check their cars as soon as these signs appear to avoid the engine light coming on or stalling midway—driving safety is more important.
Difficulty starting the engine is the most common symptom when the high-voltage line is faulty. Several times I had to struggle for a long time to get the engine started. After starting, the car kept shaking, even the seats were vibrating, and there was no response when pressing the accelerator with weak acceleration. Fuel consumption also increased significantly, requiring refueling after just a few hundred kilometers. The problem worsens in humid weather, and the engine noise becomes erratic. It's better to fix it early to save trouble.
