What are the symptoms of a bad ignition coil?
2 Answers
One symptom of a bad ignition coil is idle shaking. Below is relevant information about ignition coils: 1. Basic principle: A typical ignition coil contains two sets of windings - the primary coil and the secondary coil. The primary coil uses thicker enameled wire, usually wound with approximately 200-500 turns of 0.5-1mm enameled wire; the secondary coil uses finer enameled wire, typically wound with about 15,000-25,000 turns of 0.1mm enameled wire. One end of the primary coil connects to the vehicle's low-voltage power supply (+), while the other end connects to the switching device (circuit breaker). One end of the secondary coil connects to the primary coil, and the other end connects to the high-voltage output terminal to deliver high-voltage electricity. 2. Types of coils: Ignition coils are divided into open-core and closed-core types based on their magnetic circuits.
One of the ignition coils in my car failed recently. While driving on the road, the engine suddenly started shaking violently, feeling like the car was trembling, especially noticeable at low speeds or when waiting at traffic lights. Acceleration also became sluggish, with the car struggling to pick up speed even after pressing the gas pedal for a while, and fuel consumption inexplicably increased significantly. I also noticed the malfunction indicator light on the dashboard was on. After checking, I found out it was a cylinder misfire issue. If the ignition coil isn't replaced promptly, it could damage the catalytic converter or even lead to more expensive repairs. After confirming the issue by connecting an OBD scanner via a mobile app, I quickly found a shop to replace it.
