How to identify common faults of spark plugs

How to identify common faults of spark plugs

spark plug ablation

when the car 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 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

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 caused by excessive carbon deposition in the combustion chamber, resulting in too small valve clearance, which further leads 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

symptom 2: electrode rounded and insulator scarred

diagnosis: this 2 Repairing the broken wire or checking the socket 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

symptom 3: insulator tip fragmentation

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

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

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

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deposits on the spark plug

deposits sometimes stick between the top of the spark plug insulator and the electrode. Car owners should not underestimate (1) generally stipulate this kind of sediment

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

symptom 1: there are oily deposits on the spark plug

diagnosis: when there are oily deposits on the spark plug, it indicates that the lubricating oil has entered the combustion chamber. If only a few spark plugs have oily deposits, it may be caused by the damage of the valve stem oil seal. However, if the spark plugs of each cylinder block are stuck with such deposits, it indicates that the cylinder has oil jumping. Generally speaking, when the air filter and ventilation device are blocked, the cylinder is prone to jump oil. At present, as long as it is not a monopoly industry

symptom 2: there are black deposits on the spark plug

diagnosis: there are black deposits on the spark plug electrode and inside, which usually indicates that the mixed gas in the cylinder is too rich. The owner can increase the running speed of the engine for a few minutes to burn off the black soot layer left on the electrode. (end)