How to Determine if a Car's High-Voltage Wire is Faulty?
2 Answers
The cylinder corresponding to the ignition coil will not function, resulting in rough idling, lack of power when accelerating, and even failure to accelerate, along with the illumination of the malfunction indicator light. During idling, the engine may sometimes shake or remain stable, but it will definitely shake and lack power when accelerating. During acceleration, intermittent power loss may occur, leading to weak acceleration and shaking. When the air-fuel mixture reaches the exhaust pipe, it may combust due to the high temperature of the exhaust pipe. This combustion generates a large amount of heat, which can clog the catalytic converter's pores, causing it to fail.
As an experienced veteran driver, I often encounter engine shaking issues caused by faulty high-tension wires. For diagnosis, you can first observe after starting the car: if the engine runs unstable at idle, the vehicle body vibrates violently, or cold starts are particularly difficult, these all indicate potential high-tension wire problems. Next, open the hood and carefully inspect each high-tension wire in good lighting conditions - cracks, whitening/yellowing, or surface damage are all signs of aging; rainy and humid conditions will worsen symptoms, causing short circuits and current leakage. The most reliable method I use is testing with a multimeter: unplug the high-tension wire and measure resistance - normal values should be between 5-15 kilohms, values exceeding this range or showing infinity indicate failure. Don't ignore minor issues - faulty high-tension wires can cause poor spark plug ignition, leading to incomplete fuel combustion, increased fuel consumption by over 10%, or even black exhaust smoke polluting the environment. Regular maintenance can prevent these problems, such as annual inspections and timely replacement to avoid engine misfire damage.
