What Happens If Car Spark Plugs Are Not Replaced for a Long Time?
2 Answers
If car spark plugs are not replaced for a long time, the following issues may occur: difficulty starting, reduced power, excessive exhaust emissions, and increased fuel consumption. Under normal maintenance conditions, spark plugs should be replaced after driving 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it is recommended to follow the vehicle's manual. The following standards can be referenced for maintenance replacement: platinum spark plugs should be replaced at 40,000 kilometers, standard nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers. Steps for replacing spark plugs: Open the engine hood, lift the plastic cover of the engine, and remove the high-voltage ignition wires. Mark the position of each cylinder to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for any external debris such as leaves or dust, and ensure they are thoroughly cleaned. Place the new spark plug into the spark plug hole, hand-tighten it a few turns, and then use the socket to tighten it further. Reinstall the high-voltage ignition wires in the firing order, and then secure the cover.
Not changing spark plugs for a long time can cause ignition problems, severe engine vibration, and a noticeable increase in fuel consumption. I've seen many car owners neglect this, resulting in difficulty during acceleration and poor performance when climbing hills. Worn-out spark plugs lead to incomplete combustion of the air-fuel mixture, increased carbon deposits, and in severe cases, damage to the catalytic converter, which can be costly to repair—potentially costing thousands. To prevent these issues, I recommend replacing them according to the manufacturer's manual, typically every 2-3 years or 60,000-80,000 kilometers. This saves money and ensures safety. If your car breaks down on the road, it can be a major hassle, so get it checked at a professional shop promptly—don’t let small issues turn into big problems.
