What Are the Symptoms of Excessive Carbon Buildup on Spark Plugs?

1 Answers
StHannah
07/29/25 2:03pm
Symptoms of excessive carbon buildup on spark plugs: difficulty starting the car, low power, excessive exhaust emissions, increased fuel consumption. Steps to replace spark plugs: Open the engine hood, lift the plastic cover of the engine, 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 everything is cleaned thoroughly. 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 ignition wires in the firing order, then snap the cover back into place. Spark plug replacement interval: Under normal maintenance conditions, replace spark plugs every 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it's recommended to follow the user manual. Refer to the following standards 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.
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