Analysis of common faults and symptoms of spark plug affecting dynamic performance
Category:Repair technology - Date:2018-04-11
oil deposits on the plug are lubricating oil entering, and the top of the insulator may be cracked with low gasoline mark. In maintenance Car attention should be paid to the condition of spark plugs. Good spark plugs can improve the dynamic performance of vehicles.
normally, the life of the spark plug is 15000 km, and the service life of the long acting spark plug does not exceed 30000 km. However, many car owners' spark plugs often have problems like this, which do not meet their normal service life.
in fact, the working temperature of the spark plug is quite high. When the engine is running normally, the temperature of the insulator of the spark plug is generally between 500 and 600 degrees Celsius. Too high or too low temperature has no effect on spark plugs. When the spark plug temperature is too low, the insulator on the spark plug is easy to accumulate carbon, resulting in leakage of electricity, resulting in a lack of fire. If the spark plug working temperature is too high, it will cause early ignition and engine knock. stay Chery in the automobile training camp, the staff of the exclusive store can classify the common failures of the spark plug into two kinds. One is the serious erosion of the spark plug, the other is the sediment of the spark plug.
Spark plug ablation
when the owner finds a scar or destruction at the top of the spark plug, the electrode appears melting, and the phenomenon of ablation, the spark plug has been destroyed and the spark plug should be replaced at this time. During the replacement process, the vehicle owner can check the signs and color changes of the spark plug ablation.
symptoms 1: electrode melts and insulators are white.
diagnosis: this phenomenon indicates that the temperature in the combustor is too high. This may be too much Coke in the combustion chamber, resulting in too small valve clearance, further causing overheating of the exhaust valve or poor working of the cooling device. When the spark plug is not tightened according to the prescribed torque, it will also cause electrode melting and insulators appear white.
Symptom 2: the electrode is round and the insulator knot has a scar.
diagnosis: This indicates that the early ignition of the engine may be caused by premature ignition time, too low gasoline octane number and high calorific value of spark plugs.
Symptom 3: fragmentation of insulators at the top
diagnosis: in general, detonation combustion is the main cause of the breakdown of insulators. The ignition time is too early, the gasoline octane number is low, and the combustion chamber temperature is too high, which may cause the engine knock combustion.
Symptom 4: the top of insulator is gray and black stripe.
diagnosis: the appearance of this stripe indicates that the spark plug has leaked and the owner needs to replace the new parts unconditionally.
There is sediment on the spark plug
sometimes the deposits between the top and the electrodes of the spark plug insulator will be sticky. The owner of the car should not look down on the sediment.
in severe cases, the engine may not work properly. After cleaning the spark plug, the vehicle can be operated normally for a while, but similar situations will occur shortly. In fact, the deposit of spark plug is only a surface phenomenon, which may be a sign of problems with other parts of the vehicle.
Symptom 1: an oily sediment on the spark plug
diagnosis: when an oil deposit occurs on the spark plug, it indicates that the lubricating oil has entered the combustion chamber. If there are oily deposits on individual spark plugs, it may be caused by damage to the valve stem oil seal. But if the spark plugs of each cylinder block are adhered to this sediment, it appears that the cylinder is leapt. Generally speaking, when the air filter and ventilation device are blocked, the cylinder is prone to jump oil.
Symptom 2: there is black sediment on the spark plug
diagnosis: the spark plug electrode and internal black deposits usually indicate excessive concentration of mixed gases in the cylinder. The owner can increase the speed of the engine and continue for a few minutes to burn a layer of black soot on the electrode.
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