How to identify common faults of spark plugs[汽车修理知识]

When the car owner found outSpark plugWhen there is a scar or damage on the top, 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.

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 excessive carbon deposits in the combustion chamber, resulting inValveThe clearance is too small, which will further cause the exhaust valve to overheat or the cooling device to work badly. 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 becomes round and the insulator is scarred

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

Symptom 3: The top of the insulator is broken

Diagnosis: 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.

Symptom 4: Gray-black stripes on the top of the insulator

Diagnosis: The appearance of this streak indicates that the spark plug has leaked, and the owner needs to replace it with a new one unconditionally.

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 mechanical parts of the vehicle.

Symptom 1: Oily deposits on the spark plug

Diagnosis: When oily deposits appear on the spark plug, it indicateslubricating oilHas entered the combustion chamber.If there are oily deposits on individual spark plugs, it may be the valve stemOil sealCaused by damage. However, if the spark plugs of each cylinder block have such deposits, it indicates that the cylinder is leaking oil.Generally speaking, inair filterWhen the ventilation device is blocked, the cylinder is prone to oil spilling.

Symptom 2: Black deposits on the spark plug

Diagnosis: There are black deposits on the spark plug electrode and inside, which usually indicates that the gas mixture in the cylinder is too thick.Owners can increase engine transportRotating speedAnd last for a few minutes to burn off the layer of black soot left on the electrode.

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