How often should ignition coils be replaced?
2 Answers
Ignition coils should be replaced every 100,000 kilometers. The ignition coil, also known as the high-voltage coil, contains a primary coil and a secondary coil. The primary coil is made of thicker enameled wire, with one end connected to the positive terminal of the vehicle's low-voltage power supply and the other end connected to the switching device (breaker). The secondary coil is made of thinner enameled wire, with one end connected to the primary coil and the other end connected to the high-voltage output terminal to deliver high-voltage electricity. Ignition coils are categorized into open-core and closed-core types based on their magnetic circuits. Traditional ignition coils use an open-core design, with the core made of stacked 0.3mm silicon steel sheets and wound with both secondary and primary coils. Closed-core coils have the primary coil wound around the core, followed by the secondary coil on the outside, with the magnetic flux forming a closed loop through the core.
When discussing the replacement cycle of ignition coils, I have to say it's not a fixed-interval part—it depends on your car's condition and driving habits. Generally, if your car has driven around 80,000 to 100,000 kilometers, or shows symptoms like engine shaking, unstable idle speed, or sluggish acceleration, it's time to consider an inspection. The ignition coil is responsible for supplying power to the spark plugs for ignition, and it tends to degrade under high temperatures and vibrations, leading to misfires or increased fuel consumption. Avoiding frequent short trips in daily driving and checking the coil connections for tightness after the engine cools down can help extend its lifespan. I've seen many friends wait until their car breaks down to replace it, only to find that the towing fee costs more than the coil itself. Most OEM coils for common car models can last seven or eight years without issues, but if you frequently drive long distances or at high RPMs, such as on highways, the coil wears out faster. During regular maintenance, have a technician test the resistance value—identifying potential issues early will save you hassle and ensure safety.
