What are the symptoms of faulty spark plug ignition?

[MacMariana]

Symptoms of faulty spark plug ignition include: difficulty starting the engine, reduced power, excessive exhaust emissions, and increased fuel consumption. In such cases, the spark plugs need to be replaced. Steps for replacing spark plugs: Open the engine 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 like leaves or dust and ensure thorough cleaning. Place the new spark plug into the spark plug hole, hand-tighten it a few turns, then use the socket to fully tighten it. Reinstall the high-voltage ignition wires according to the firing order, then secure the cover. Replacement interval for spark plugs: Under normal maintenance conditions, replace them every 40,000–60,000 kilometers. However, this may vary depending on the brand and engine type. Always refer to the owner's manual for guidance. Maintenance replacement can be based on the following standards: platinum spark plugs should be replaced at 40,000 km, standard nickel alloy spark plugs at 20,000 km, and iridium spark plugs at 60,000–80,000 km.