Under what circumstances do spark plugs need to be replaced?

Hello, according to different equipment, spark plugs can be divided into many types, and the usage and life are also different. If the spark plug is not replaced for a long time, the car will shake, unable to speed up, or unable to catch fire, so the spark plug should be replaced in time.

Generally, after driving 4 to 60,000 kilometers, the spark plug needs to be replaced, and if the car has increased fuel consumption or insufficient power, it may need to be replaced.

Spark plugs and ignition coils are important components in the engine ignition system, and spark plugs are a wearing part that needs to be replaced regularly.

If the spark plug is used for a long time, it will cause the electrode gap to become larger, which will affect the ignition of the spark plug.

If the spark plug is used for a long time, carbon deposits will also occur on the electrode, which will also affect the ignition of the spark plug.

The spark plug is connected to the ignition coil, which can convert 12V into thousands of volts, only then will the spark plug have enough ignition energy.

The normal operation of the ignition system is very important for the engine, if the ignition system does not work properly, the combustible mixture in the engine can not be fully combusted, which will lead to a decrease in engine power.

Although the ignition coil is not a consumable part, it can be damaged when working in a high temperature environment.

When replacing the spark plug, attach a sticker to the hole where the spark plug is installed after removing it to prevent foreign objects from falling into the cylinder.

When installing the spark plug, the spark plug should be tightened using a special torque wrench. If it is not tightened, it may cause the cylinder to leak. If it is tightened too tightly, it may cause the spark plug to break.

First, the engine shakes badly.

Whether the engine can be started smoothly occupies an important role, and the spark plug is the key part, whether the car can run stably and continuously, it depends on whether the engine is powerful, but whether the engine can work normally, without the first flower plug, once there is abnormal shaking, pay attention quickly, otherwise the engine will be overhauled.

Second, abnormal starting.

If it doesn't catch fire for a long time, it means that the spark plug needs to be replaced, don't wait until the car turns off and can't move, it's too late.

Third, there is a situation of shrugging.

Under normal circumstances, the car is relatively stable, and there will not be much abnormal movement, but when the car is sensational, it may be insufficient fuel supply, and the driving is fast and slow, which is the result of the instability of the spark plug.

The spark plug is punctured, and the spark plug has to be replaced immediately.

Under what circumstances do spark plugs need to be replaced?

When the owner finds that the top of the spark plug is scarred or damaged, and the electrode is melted or ablated, it indicates that the spark plug has been destroyed, and the spark plug should be replaced. During the replacement process, the owner can check the symptoms of spark plug ablation and the change in color.

When oily deposits appear on the spark plugs, it is an indication that the lubricating oil has entered the combustion chamber. If there are only oily deposits on individual spark plugs, it may be caused by a damaged valve stem oil seal. However, if this deposit is adhered to the spark plugs of each cylinder, it indicates that the cylinder has burst oil.

Generally speaking, when the air filter and ventilation are clogged, the cylinder is very susceptible to the phenomenon of excess oil rushing.

Deposits sometimes stick to the tip of the spark plug insulator and between the electrodes. Car owners should not underestimate this deposit.

In severe cases, this condition may cause the engine to work properly without a source. After cleaning the spark plugs, the vehicle can be operated normally for the time being, but a similar situation will occur soon after. In fact, the presence of spark plug deposits is only a superficial phenomenon, which may be a sign of a debris problem in other mechanical parts of the vehicle.

The presence of black deposits on the spark plug electrodes and inside usually indicates that the gas mixture in the cylinder is too concentrated. The owner can increase the engine speed for a few minutes to burn off the black soot layer left on the electrodes.

To reach the number of kilometers of the car, the car idling shakes, the car accelerates weakly, the fuel consumption is large, the car can not be driven, and it is difficult to start these four situations need to replace the spark plug.

1. Replace according to the number of kilometers of the car.

Regardless of the material of the spark plug, it can generally be replaced at 40,000 kilometers, at this time the gap of the spark plug has become larger, although it can still be used but has affected the performance of the car, it is necessary to replace it decisively.

2. The car idles and shakes, and the spark plug is replaced.

If you obviously feel that the engine is shaking, but it does not have much effect during the acceleration of the car, then you should suspect that the fault is caused by the spark plug, and the problem can be solved by replacing the spark plug.

3. The acceleration of the car is weak, the fuel consumption is large, and the spark plug is replaced.

Many faults will affect the power of the car, but the most basic is the ability of the spark plug to ignite, and the spark plug must have sufficient ignition energy when the throttle is high and the load is high.

4. The car can't be opened, it is difficult to start, and the spark plug is replaced.

If the spark plug model is wrong or the conductive electrode is seriously worn, it cannot provide enough energy at the moment of car starting, the mixture cannot be ignited, and the car cannot be started.

Criteria for spark plug selection

The selection of a spark plug determines the calorific value of the engine based on its compression ratio, rotational speed and air-fuel ratio.

Commercially available spark plug calorific values range from 5 to 13. The higher the value, the "colder" the spark plug becomes, the so-called cold type, which is required for high compression ratio engines. The lower the number, the more "hot" the spark plug is, i.e. hot, and low compression ratio engines use hot-type spark plugs.

1.The flammable mixture is too thick. The remaining unburned part will accumulate in the spark plug electrode.

On carbonization, which leads to the abnormal ignition of the flower plug until it is damaged by charcoal. The reason for the excessive concentration of the combustible mixture is generally that the oil level of the carburetor is too high and the carburetor is dominant.

The air measuring hole is blocked, and the air filter element is seriously blocked. In addition, the choke door of the carburetor is stuck and cannot be fully opened, or the thickening valve is not working well, which is also the cause of the overconcentration of the combustible mixture.

2.Engine channeling oil. During the operation of the engine, if the exhaust pipe is blue.

Smoke, black smoke, indicates that excess oil is entering the cylinder, which will cause the spark plug electrode to be generated.

A large amount of carbon is deposited, or it is wetted by the engine oil and cannot jump the fire, this phenomenon is commonly known as engine channeling oil. For two-stroke engines, check whether the oil pump volume of the oil pump is too large, and whether the rod sleeve seal and check valve are invalid; For four-stroke engines, the activity on the piston should be checked.

Whether the plug rings, especially the oil rings, are worn. Then remove the intake valve and check the head and back for carbon deposits and wet grease. For example, the valve and valve guide are severely worn, the valve guide oil seal is hardened or the oil seal lip is worn.

Excessive, it will cause its fitting gap to be too large and lose its sealing effect. Both of these anomalies will eventually cause the oil in the rocker chamber of the valve to flow along the gas when the intake air is summed.

The door shaft is sucked into the cylinder, causing the phenomenon of burning oil. In this regard, the valve guide, oil seal or valve should be replaced separately depending on the wear and tear.

3.In the ignition system, magneto demagnetization, ignition coil and electronic ignition inside, generator output end and ignition coil loser end of wire connection loose, as well as incorrect ignition advance time, such as improper timing, can affect ignition performance, and ignition performance is poor, can directly cause spark plug electrode carbon deposit.

4.Pay attention to whether the model and calorific value of the spark plug comply with the provisions of the instruction manual. If.

When the calorific value is one or two gears lower than the instruction manual, the temperature of the spark plug will rise.

It is very high, and its heat cannot be dissipated in time, which causes abnormal combustion, and eventually leads to the melting of the spark plug electrode and premature damage. The spark plug itself is installed and used.

There are also some failures that are not easy to detect and also affect the ignition performance. For example, the spark plug is poorly sealed, the spark plug is not firmly fixed, the spark plug insulator is broken, etc., it should be adjusted in time or.

Replacement. 5.If the crankcase oil is filled too much, if the ventilation pipe is blocked, the pressure in the crankcase will increase and cannot be balanced.

When the engine is cold and hot, it is difficult to start, after the car, the idle speed is unstable, shaking, poor acceleration, insufficient power, the idle speed self-stalling phenomenon frequently occurs, and the oil and gas consumption increases, etc., the spark plug needs to be replaced.

There are two reasons for these failures:

One is that the spark plug is stuck with sediment, which will become thicker and thicker due to the long-term use of the spark plug, and eventually the spark plug will not work properly.

Second, due to spark plug ablation, if there is too much carbon accumulation in the combustion chamber, resulting in poor work, and the temperature in the combustion chamber is too high, it is easy to cause the spark plug to appear electrode melting and ablation.

The voltage that the ignition coil can provide is limited, and even the spark plug in normal use will increase as the spark plug electrode is lost, and the voltage demand to break down the spark plug gap increases. Therefore, during rapid acceleration, high speed or heavy load, misfire will occur, resulting in vehicle shaking, acceleration difficulties and fuel waste. Therefore, the spark plugs need to be replaced regularly to keep the engine running at its best, which can also save more fuel for the car.

Photo by Li Shuiqing) Xingrui Ideal One Model Y Model X Hiphi X Leap T03 @2019

The engine must operate to meet the requirements of proper cylinder pressure, good burner silver-to-oil mixture, correct ignition timing, and strong sparks. These are the three essential elements of automotive operations. The spark produced by the spark plug is the energy required to ignite the mixture.

That is to say, if there is a problem with the spark plug, the engine cannot be started or it is difficult to start (especially when it is cold), a single spark plug lacks fire and cannot do work, and then the engine shakes, and the engine fault light lights up and alarms. When the spark plug gap exceeds 1 mm, that is, when the gap becomes larger, it will lead to poor combustion and increased fuel consumption. The spark plug can also be replaced at this time.

Precautions for replacing spark plugs.

1.When there is a problem with the spark plug, we may wish to see if our warranty manual states whether the spark plug is a consumable part. Iridium spark plugs or platinum spark plugs used in some models are not covered by consumables. The warranty period is the same as that of the whole vehicle.

2.If you look closely, it turns out that there is a layer of grease on the spark plug insulator or inside the ignition coil of the car. This layer of grease is called high-voltage insulating silicone.

It is mainly to prevent high-voltage electrical appliances from breaking down insulators. Let the spark plug and ignition coil have good lubrication and facilitate plugging and unplugging, so as not to damage the windings in the ignition coil. In addition, it has good thermal stability, which improves the service life of the spark plug.

But in fact, in the later maintenance and replacement of spark plugs, many repair shops and even 4S shops will not apply this high-voltage insulating silicone, and the actual use effect is not abnormal. I don't think it's that mysterious. It can only be said to be the icing on the cake, not a necessity.

3.In winter, the temperature is low, and it is difficult to start the engine. One of the causes of failure is that the spark energy generated by the gap between the spark plugs is too small to ignite the mixture.

If this is the case with the chop fruit, it is necessary to pay attention to the starting interval and time. Because the car fails to start many times, the spark plug will be "drowned" by the gas mixture, which will make driving more difficult or even impossible to drive again.

4.Spark plugs have heat generation requirements (heat dissipation capacity), and their heat generation cannot be changed by the way. If the two are interchanged, the cold spark plug will be difficult to drive, while the hot spark plug will be prone to burn the electrodes.

This calorific value will be displayed on the spark plug housing. In addition, different types of electrode shapes have different ignition properties. And square and pointed shapes are more likely to form sparks, while round shapes are less prone to sparks.

5.Spark plugs have a self-cleaning temperature and an autoignition temperature. The self-cleaning temperature is around 450°C, so there is no need for daily cleaning.

The autoignition temperature is around 950°C, which is not mainly an option for spark plugs and generally does not appear.

Millions of car purchase subsidies.

Hello dear! First of all, we need to figure out how the spark plug works. The ignition of the spark plug mainly relies on the electrode of the head, and the discharge is made at the small tip of the center, and the electrode is contacted by the high-voltage discharge, and the mixed gas in the cylinder is ignited by an electric spark, so that it burns and expands to do work.

Therefore, if you want to judge when you need to replace the spark plug, the direct way is to take it off and observe it yourself, if the electrode is gone, then its ignition performance will decline, the combustion will not be so smooth, the car is difficult to start, shivering, there will be obvious frustration. Under normal circumstances, as long as the electrode is not damaged and the car does not have these problems, it can continue to be used. But when you go to maintenance and repair, some maintenance masters take it off, he will point it to you, you see that there are a lot of oil stains on your spark plug, and there are traces of burning wire, quickly replace it, if you don't understand, look at the black burn is not slippery, it is time to change, in fact, when the spark plug is working, it produces electric sparks, and it is normal to have these traces of burning wire, and there is no need to change it at all, wash the oil stains, and you can continue to use it.

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