What Causes Water on Spark Plugs? Is It Serious?

[LaGiselle]

When oily deposits or a small amount of moisture appear on the spark plugs, it indicates that lubricating oil has entered the combustion chamber. If only individual spark plugs have oily deposits, it may be caused by damaged valve stem oil seals. Damaged spark plugs can lead to the following issues: difficulty starting the engine, 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 distributor 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 plug into the spark plug hole, hand-tighten it a few turns, and then use the socket to tighten it further. Reinstall the removed high-voltage distributor wires according to the firing order, then secure 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's advisable to follow the owner's manual. Here are some general guidelines for 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.