The presence of oily deposits on the plug is the entry of oil and the cracking of the top of the insulator may be a low gasoline label. When maintaining a car, more attention should be paid to the condition of the spark plug, and a spark plug with excellent performance can improve the vehicle's dynamic performance. Under normal circumstances, the spark plug has a service life of 15,000 kilometers and the long-acting spark plug has a service life of no more than 30,000 kilometers. However, many owners of spark plugs often have problems like this, failing to reach their normal service life. In fact, the working temperature of spark plugs is quite high. When the engine is running normally, the temperature of the spark plug insulator skirt is generally kept between 500 and 600 degrees Celsius. Excessively high or low temperature has no effect on the spark plug. When the temperature of the spark plug is too low, the insulator on the spark plug is likely to deposit carbon, eventually causing leakage and even causing a misfire. If the operating temperature of the spark plug is too high, pre-ignition and engine knock can easily occur. Common faults are summarized in two ways. One is severe ablation of spark plugs, and the other is deposits of spark plugs. Spark plug ablation When the owner of the spark plug found that the top of the spark plug or damage, the electrode appears to melt, ablation phenomenon, all indicate that the spark plug has been destroyed, this time should replace the spark plug. During the replacement process, the owner can check the spark plug ablation symptoms and changes in color. Symptom 1: The electrode melts and the insulator is white Diagnosis: This phenomenon indicates that the temperature in the combustion chamber is too high. This may be due to too much coke in the combustion chamber, resulting in too small a valve clearance, further causing overheating of the exhaust valve or poor operation of the cooling device. When the spark plug is not tightened according to the specified torque, the electrode will melt and the insulator will appear white. Symptom 2: The electrode is rounded and the insulator is scarred Diagnosis: This indicates that the engine is pre-ignited, which may be caused by the ignition time being too early or the gasoline octane rating being too low and the spark plug being too hot. Symptom 3: Disruption of insulator tip Diagnosis: In general, knocking combustion is the main reason for the breakdown of insulators. The ignition timing is too early, the octane number of gasoline is low, and the temperature in the combustion chamber is too high, which may cause the engine to knock and burn. Symptom 4: Gray and black stripes on top of the insulator Diagnosis: The presence of this streaking indicates that the spark plug has leaked and the owner needs to replace the new one unconditionally. Spark plugs with deposits Spark plug insulators sometimes have deposits on their tops and between electrodes. Owners should not underestimate this deposit. In severe cases, this condition may cause the engine not to work properly. After cleaning the spark plugs, the vehicle can be operated normally for a while, but something similar will happen soon. In fact, the presence of deposits in spark plugs is only a surface phenomenon, which may be a sign of problems with other mechanical parts of the vehicle. Symptom 1: Oily deposits on spark plugs Diagnosis: When an oily deposit appears on the spark plug, it indicates that the lubricant has entered the combustion chamber. If only a few spark plugs have oily deposits, damage to valve stem seals may be caused. However, if the spark plug of each cylinder sticks to this kind of deposit, the cylinder will appear as oleophobic. In general, in the case of air filter and ventilation device plugged, the cylinder is prone to oleophobic phenomenon. Symptom 2: Black deposits on spark plugs Diagnosis: There is a black deposit on the spark plug electrode and inside, which usually indicates that the gas mixture in the cylinder is too rich. The owner can increase the speed of the engine and continue for a few minutes to burn off a layer of black soot on the electrode.
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