What Causes Spark Plugs to Fail Easily?
2 Answers
Reasons why spark plugs fail easily: The fuel-air mixture in the car is too rich, causing unburned portions to accumulate and carbonize on the spark plug electrodes, leading to abnormal phenomena such as misfiring and damage. In such cases, the spark plugs need to be replaced promptly. Spark plugs ignite gasoline by generating sparks, working in coordination with the car engine's ignition and fuel supply systems to enable engine operation, significantly influencing the engine's performance. Spark plugs operate under harsh conditions of high temperature, high pressure, electrical stress, and chemical corrosion, requiring good insulation, strong corrosion resistance, and sufficient mechanical strength. Despite these requirements, failures are inevitable during use, making spark plugs one of the components with a higher failure rate in the ignition system.
I've been repairing cars for nearly twenty years, and spark plug failures are all too common, often due to owners using inferior products or improper installation. Long-term high engine temperatures or carbon buildup can cause spark plugs to burn out prematurely, especially in older models where poor seals allow oil contamination that directly clogs the gap. I've even seen cases where ignition system issues caused excessive voltage, leading to electrode breakdown. I recommend choosing OEM spark plugs and checking them every 20,000 kilometers; pay attention to engine shaking or difficulty starting while driving, as these are telltale signs. Don't overlook this small component—it affects fuel efficiency and environmental protection, and timely maintenance saves big money.
