How to deal with common problems of spark plugs

A spark plug with excellent performance can improve the dynamic performance of a vehicle. When maintaining a car, pay more attention to the condition of the spark plug.

Under normal circumstances, the service life of spark plugs is 15,000 kilometers, and the service life of long-lasting spark plugs does not exceed 30,000 kilometers. However, many car owners' spark plugs often have problems of this kind, and they cannot reach their normal service life.

Spark plug ablation

When the car owner finds that there is a scar or damage on the top of the spark plug, and the electrode is melted or ablated, it indicates that the spark plug has been destroyed, and the spark plug should be replaced at this time. During the replacement process, the owner can check the symptoms of spark plug ablation and color changes. This phenomenon indicates that the temperature in the combustion chamber is too high. This may be caused by excessive carbon deposits in the combustion chamber, resulting in too small valve clearance, which may further lead to 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. Generally speaking, knocking combustion is the main cause of insulator rupture. Premature ignition time, low gasoline octane number, and high temperature in the combustion chamber may all cause the engine to knock and burn.

Deposits on the spark plug

Deposits sometimes stick to the tip of the spark plug insulator and the electrode. Car owners should not underestimate this deposit. In severe cases, this situation may cause the engine to fail to work normally. After cleaning the spark plugs, the vehicle can be operated normally for the time being, but a similar situation will occur soon. In fact, the presence of deposits on spark plugs is only a superficial phenomenon, which may be a signal of problems with other parts of the vehicle. When oily deposits appear on the spark plug, it indicates that the lubricating oil has entered the combustion chamber. If there are only oily deposits on individual spark plugs, it may be caused by damage to the valve stem oil seal. If there are black deposits on the spark plug electrode and inside, it usually indicates that the gas mixture in the cylinder is too rich. The owner can increase the engine speed for a few minutes to burn off the layer of black soot left on the electrode.

Source: Shenzhen Special Zone News