What Causes the Whitening of Spark Plug Electrodes?
2 Answers
The whitening of spark plugs can be caused by several factors: the engine's ignition timing being too early, poor cooling conditions; the use of low-quality fuel; cylinder leakage in the car, or insufficient installation torque. It is necessary to promptly clean the engine's carbon deposits and replace the spark plugs after cleaning. Steps to replace spark plugs: Open the hood, lift the engine's plastic 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 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 removed high-voltage distributor wires in the firing order, then secure the cover. Spark plug replacement interval: 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. You can 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.
With years of experience in auto repair, the most common cause of white spark plug electrodes is a lean fuel mixture, meaning there's too much air and too little gasoline in the combustion chamber, leading to an imbalance in the air-fuel ratio and a spike in temperature. This could stem from clogged fuel injectors or leaks in the intake system, where excess air is drawn in without enough fuel. Another factor is advanced ignition timing, where the spark ignites too early, causing excessive combustion heat. I've serviced many customers' cars where white electrodes were often accompanied by increased engine noise and reduced power. It's crucial to check if the cooling system is functioning properly—issues like a clogged radiator or a non-working fan can lead to inadequate heat dissipation. Long-term high-RPM driving also makes electrodes more prone to whitening and burning out. Don't delay; visit a professional shop promptly to diagnose fuel and ignition system parameters with a scanner. Address the root cause before replacing spark plugs to prevent further engine damage and higher repair costs.
