Can Spark Plugs Be Used After Cleaning?
2 Answers
Spark plugs can be used after cleaning. Generally, spark plugs should be replaced every 20,000 kilometers or so, and cleaned every 2,000 to 3,000 kilometers. Spark plugs, commonly known as sparkers, function by discharging the high-voltage pulses sent from the high-voltage wires (spark plug wires), breaking down the air between the two electrodes to generate an electric spark, thereby igniting the air-fuel mixture in the cylinder. The main types of spark plugs include: standard spark plugs, extended insulator spark plugs, electrode-type spark plugs, seat-type spark plugs, pole-type spark plugs, and surface-gap spark plugs. Spark plugs, in conjunction with the ignition system and fuel supply system, enable the engine to perform work, collectively determining the engine's performance to a large extent.
Whether spark plugs can be reused after cleaning depends on the specific situation. Mild carbon deposits can indeed be restored to performance after cleaning. For example, I once cleaned the copper-core spark plugs of an old car myself—removed them, soaked them in carburetor cleaner for ten minutes, gently brushed off the carbon deposits with a soft brush, let them dry completely, and reinstalled them. The ignition became much smoother afterward. However, it's crucial to check the condition of the electrodes. If they are already eroded, deformed, or if the ceramic body has cracks, cleaning won’t extend their lifespan much. After cleaning, always verify that the electrode gap is within the standard range of 0.8-1.2 mm; otherwise, ignition efficiency will be affected. This method is only suitable as a temporary fix. An old car might run a few thousand kilometers more after cleaning, but for modern direct-injection engines, it’s safest to replace spark plugs regularly.
