Does a Whitened Spark Plug Need Replacement?
2 Answers
Spark plugs that have turned white do not need immediate replacement; they should be replaced according to the regular maintenance schedule. The whitening of the spark plug tip is caused by a higher proportion of gas in the air-fuel mixture, and as long as there are no granular deposits, this is a normal phenomenon. The spark plug is a crucial component of a gasoline engine's ignition system. It introduces high voltage into the combustion chamber, creating a spark across the electrode gap to ignite the combustible air-fuel mixture in the cylinder. Spark plug replacement interval: Under normal maintenance conditions, replacement is recommended 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 vehicle's 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. However, if the vehicle experiences difficulty starting, reduced power, excessive exhaust emissions, or increased fuel consumption, the spark plugs should be replaced promptly as they are likely damaged.
Having driven for decades, I can say white spark plugs absolutely need replacement. When my old car had this issue before, I ignored it and ended up with engine overheating and shaking, costing a fortune in repairs. White spark plugs usually indicate excessively high combustion temperatures, possibly due to a lean fuel mixture or advanced ignition timing, causing the electrodes and porcelain to turn white. If not replaced promptly, not only will the spark plugs fail, but it may also damage the engine block or valves, leading to more severe malfunctions. During routine maintenance, I make it a habit to inspect spark plugs every 20,000 to 30,000 kilometers; if whitening is observed, I recommend replacing them immediately—don’t risk major damage to save a small amount. Safe driving is crucial, and this small component directly affects the engine’s overall health and lifespan.
