How Often Should Spark Plugs Be Replaced? And Why?
2 Answers
Spark plug replacement interval: Under normal maintenance conditions, replacement is recommended after driving 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it's advisable to follow the owner's manual. The following standards can be referenced for maintenance replacement: Platinum spark plugs should be replaced at 40,000 kilometers, ordinary nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers. Damaged spark plugs can cause the following issues: If spark plugs are damaged, they can directly cause leakage in the vehicle's ignition system, increased fuel consumption, reduced power, and many other problems. The most significant issue is difficulty in ignition, which affects the normal operation of the vehicle. Severe erosion of the spark plug, such as scarring at the top, damage, or melting and erosion of the electrodes, indicates that the spark plug is damaged and should be replaced. Steps for replacing spark plugs: Open the hood, lift the engine's plastic cover, and remove the high-voltage 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 like leaves or dust and ensure the area is clean. 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 wires according to the firing order and secure the cover.
Spark plugs are like the heart pacemakers of an engine. I've been driving for over a decade and basically replace them according to the maintenance manual. For ordinary nickel alloy ones, you need to pay attention after 20,000-30,000 km. Last time, my old companion started shaking like a leaf during cold starts at 35,000 km. Platinum ones can last 50,000-80,000 km, while iridium ones are even more durable. Why replace them? As the electrodes wear out, the ignition energy weakens, leading to incomplete combustion of the air-fuel mixture. Fuel consumption can skyrocket by 15%, and black smoke may come out of the exhaust pipe. What's even more painful is that prolonged neglect might burn out the ignition coil, and repairing that could cost enough to replace ten sets of spark plugs. Now, after switching to iridium ones, my car's throttle feels much more responsive.
