What are the symptoms of poor contact in the ignition coil plug?
2 Answers
There are three manifestations of a faulty engine ignition coil: 1. The vehicle body shakes noticeably at idle. 2. During driving, when the RPM is below 2500, the vehicle body shakes significantly with poor acceleration. 3. Upon opening the engine hood and observing the running engine, noticeable shaking is observed. Below is relevant information: 1. Issues with spark plugs: Spark plugs are wear-and-tear components that require regular replacement. Prolonged use can cause the electrode gap to widen, leading to a loss of ignition energy. Additionally, prolonged use can result in carbon buildup on the electrodes, which may also reduce ignition energy. 2. Issues with the ignition coil: Although the ignition coil is not a wear-and-tear component that requires regular replacement, prolonged operation in high-temperature environments can easily lead to faults. If the ignition coil malfunctions, it can prevent the spark plug from firing properly. A faulty ignition coil may also cause engine misfiring.
I used to work on my car a lot myself, and a bad ignition coil connector contact is really annoying. The most obvious symptom is that the car is particularly difficult to start—sometimes it takes several attempts to get it going. Once the car starts, the engine shakes violently at idle, like sitting on a massage chair, with the tachometer jumping up and down. When accelerating, the car loses power, especially when going uphill or under load—stepping on the gas pedal barely gets any response, which makes me quite nervous. Fuel consumption also increases significantly because the incomplete combustion due to poor ignition. Over time, it affects the spark plugs, accelerating their wear. If not fixed in time, the check engine light might come on, indicating an issue with the ignition system. I once encountered this issue myself—after inspection, I found the connector was oxidized, and cleaning it fixed the problem. I’d recommend checking the connector for looseness or corrosion as soon as possible.
