How often should the spark plugs be cleaned and replaced on a 10th-generation Civic?
2 Answers
For the 10th-generation Civic, spark plugs should be replaced every 40,000 to 60,000 kilometers. The spark plug is a crucial component of the gasoline engine's ignition system. It introduces high-voltage electricity into the combustion chamber, causing it to jump across the electrode gap and generate a spark, thereby igniting the combustible air-fuel mixture in the cylinder. Steps for replacing spark plugs: Open the hood, lift the plastic cover of the engine, and remove 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 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 distributor wires according to the firing order, and then secure the cover.
I've been driving a 10th-gen Civic for several years. Regarding spark plug replacement, it's generally recommended every 60,000 to 100,000 kilometers, depending on the spark plug type and driving habits. For example, the factory-installed iridium spark plugs are more durable and can last up to around 100,000 kilometers. However, if you frequently drive short distances in congested city traffic or put heavy loads on the engine, replacement might be needed as early as 60,000 kilometers. Once, my car had difficulty starting, and the technician found that the spark plug electrodes were worn, causing misfire. After replacing them, the car ran smoothly immediately. Delaying replacement can increase fuel consumption and affect acceleration performance. Don’t forget to refer to the owner’s manual, which provides recommended intervals—usually advising inspection every 2-3 years or following maintenance instructions to ensure safe and worry-free driving. Additionally, unlike other parts, spark plugs can’t be cleaned. The small electrode holes are easily damaged, and cleaning can actually pose risks. It’s more cost-effective and reliable to replace them directly.
