What are the symptoms of worn-out spark plugs in a car?

[OAlan]

Worn-out spark plugs in a car can exhibit the following symptoms: 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's recommended to follow the vehicle's manual. Here are some general guidelines for maintenance and 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 hood, remove the engine's plastic cover, and detach the high-voltage distributor wires. 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 any external debris like leaves or dust and ensure the area is clean. Insert 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 distributor wires in the correct firing order and reattach the cover.