What are the symptoms of faulty spark plugs?
2 Answers
Symptoms of faulty spark plugs include the following: difficulty starting, reduced power, excessive exhaust emissions, and increased fuel consumption. Steps for replacing spark plugs: Open the hood, lift the plastic engine cover, remove the high-voltage ignition wires, and mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for external debris such as leaves or dust and ensure they are thoroughly cleaned. Place the new spark plugs into the spark plug holes, hand-tighten them a few turns, then use the socket to tighten them further. Reinstall the high-voltage ignition wires in the correct firing order and reattach the cover. Under normal maintenance conditions, spark plugs should be replaced every 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 used as a reference 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.
When there's an issue with the spark plugs, the first thing I notice is that the engine becomes difficult to start, especially in cold weather. It might take several attempts with the key to get it going. At idle, the car shakes violently, as if the whole vehicle is vibrating. When accelerating, pressing the gas pedal yields no response, making climbing hills or overtaking particularly challenging. Fuel consumption noticeably increases, costing an extra few dozen dollars a month in gas. Sometimes, the engine makes a popping sound, which is a sign of misfiring. In severe cases, the small engine light on the dashboard comes on. I've seen firsthand that if bad spark plugs aren't replaced promptly, incomplete combustion can damage the catalytic converter, leading to much more expensive repairs. It's best to check them every 30,000 kilometers or so, or replace them at a professional shop if something feels off. Keeping the car running smoothly is peace of mind, as neglecting this issue for too long can be a hidden danger.
