Generally, the service life of spark plugs is 15000 km, and the service life of long-term spark plugs is no more than 30000 km. However, many car owners' spark plugs often have such problems, which can not reach their normal service life.

其实，火花塞的工作温度是相当高的。发动机正常运转时，火花塞绝缘体裙部的温度一般保持在500到600摄氏度之间。温度过高或过低对火花塞影响都不好。在火花塞温度过低的情况下，火花塞上的绝缘体容易积炭，z终引起漏电以于产生缺火现象。如果火花塞工作温度过高，容易引起早燃和发动机爆震。在奇瑞汽车训练营中，专卖店的工作人员将火花塞出现的常见故障归纳为两种。一为火花塞严重烧蚀，另一种为火花塞有沉积物。

In fact, the working temperature of the spark plug is quite high. During normal engine operation, the temperature of spark plug insulator skirt is generally maintained between 500 and 600 degrees Celsius. Too high or too low temperature has a bad effect on the spark plug. When the temperature of the spark plug is too low, the insulator on the spark plug is easy to deposit carbon, Z eventually causing electric leakage and misfire. If the working temperature of spark plug is too high, it is easy to cause early combustion and engine knock. In Chery Automobile training camp, the staff of the exclusive store summarized the common faults of spark plugs into two types. One is that the spark plug is severely ablated, and the other is that the spark plug has deposits.

火花塞烧蚀

Spark plug ablation

当车主发现火花塞顶端有疤痕或是破坏、电极出现熔化、烧蚀现象时，都表明火花塞已经毁坏，此时就应该更换火花塞。在更换过程中车主可以检查火花塞烧蚀的症象以及颜色的变化。

When the owner finds that the top of the spark plug is scarred or damaged, and the electrode melts and ablates, it indicates that the spark plug has been damaged. At this time, the spark plug should be replaced. During the replacement process, the owner can check the symptoms of spark plug ablation and the change of color.

症状1：电极熔化且绝缘体呈白色

Symptom 1: the electrode is melted and the insulator is white

诊断：这种现象表明燃烧室内温度过高。这可能是燃烧室内积炭过多，从而造成气门间隙过小，进一步引发排气门过热或是冷却装置工作不良造成的。在火花塞未按规定力矩拧紧时也会造成电极熔化，绝缘体呈现白色的现象。

Diagnosis: this phenomenon indicates that the temperature in the combustion chamber is too high. This may be caused by excessive carbon deposition in the combustion chamber, resulting in too small valve clearance, further overheating of exhaust valve or poor operation of cooling device. When the spark plug is not tightened according to the specified torque, the electrode will melt and the insulator will appear white.

症状2：电极变圆且绝缘体结有疤痕

Symptom 2: the electrode becomes round and the insulator is scarred

诊断：这就表明发动机早燃，可能是点火时间过早或者汽油辛烷值过低，火花塞热值过高等原因带来的。

Diagnosis: This indicates that the engine burns early, which may be caused by premature ignition time, low octane number of gasoline and high calorific value of spark plug.

症状3：绝缘体顶端碎裂

Symptom 3: broken insulator tip

诊断：一般来说，爆震燃烧是绝缘体破裂的主要原因。而点火时间过早、汽油辛烷值低、燃烧室内温度过高，都可能导致发动机爆震燃烧。

Diagnosis: Generally speaking, knock combustion is the main cause of insulator rupture. Premature ignition time, low gasoline octane number and high combustion chamber temperature may lead to engine detonation combustion.

症状4：绝缘体顶端有灰黑色条纹

Symptom 4: there are gray black stripes on the top of the insulator

诊断：这种条纹的出现表明火花塞已经漏气，车主需要无条件更换新件。

Diagnosis: the appearance of this stripe indicates that the spark plug has leaked air, and the owner needs to replace it unconditionally.

火花塞上有沉积物

Deposits on spark plugs

火花塞绝缘体的顶端和电极间有时会粘上沉积物。车主不要小看这种沉积物。

Deposits sometimes stick between the top of the spark plug insulator and the electrode. Owners should not underestimate this sediment.

严重时这种情况可能造成发动机不能正常工作。在清洁火花塞后，车辆暂时可以得到正常运转，但不久后又会出现类似情况。事实上，火花塞出现沉积物只是一个表面现象，这有可能是车辆别的机械部件出现问题的信号。

In severe cases, this may cause the engine to not work properly. After cleaning the spark plugs, the vehicle can run normally for the time being, but a similar situation will occur again soon. In fact, the deposit on the spark plug is only a surface phenomenon, which may be a signal of problems with other mechanical parts of the vehicle.

症状1：火花塞上有油性沉积物

Symptom 1: oily deposits on spark plugs

诊断：当火花塞上出现油性沉积物时，就表明润滑油已进入燃烧室内。如果只是个别火花塞上有油性沉积物，则可能是气门杆油封损坏造成的。但如果是各个缸体的火花塞都粘有这种沉积物，则表明气缸出现蹿油。一般来说，在空气滤清器和通风装置堵塞的情况下，汽缸极易出现蹿油的现象。

Diagnosis: when oily deposits appear on the spark plug, it indicates that the lubricating oil has entered the combustion chamber. If only individual spark plugs have oily deposits, it may be caused by damage to the valve stem oil seal. However, if this deposit is adhered to the spark plugs of each cylinder block, it indicates that the cylinder has jumped up oil. Generally speaking, when the air filter and ventilation device are blocked, the cylinder is prone to jump oil.

症状2：火花塞上有黑色沉积物

Symptom 2: black deposits on spark plugs

诊断：火花塞电极和内部有黑色沉积物，通常表明气缸内混合气体过浓。车主可以增高发动机运转速度，并持续几分钟，借以烧掉留在电极上面的一层黑色煤烟层

Diagnosis: there are black deposits 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 running speed of the engine for a few minutes to burn off a layer of black soot left on the electrode

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These are the highlights of BMW maintenance in Jinan. For more highlights, please click: http://www.lutongqixiu.com We will have more wonderful content for you to check later