Regarding the problem of spark plugs, what kinds of problems generally occur with spark plugs?

What we usually call the spark plug being broken down is actually not the problem of the spark plug, but the problem of the ignition coil, so it is more appropriate to say that the spark plug is broken down than the ignition coil is broken down.

Breakdown of spark plugs is caused by insufficient fuel combustion, generally due to the following reasons:

1. Fuel problem.

2. Insufficient engine compression.

3. Poor lubricating oil.

4. The calorific value of the spark plug is not suitable.

5. Environmental problems (serious air pollution).

If the high-voltage line is connected to the spark plug or is not connected to the end, the voltage acting on the spark plug will be very large, if it is a new spark plug, it may be broken down, the old spark plug will cause leakage because of carbon or oil deposits on the electrode, if the high-voltage line is not connected to the end, it is just possible to use the high voltage at this time to overcome the breakdown voltage caused by carbon and oil deposition caused by leakage.

Extended information: The thermal characteristics of the spark plug are usually characterized by the calorific value of the spark plug in the standard, and the calorific value of the spark plug indicates the balance of heat absorption and heat dissipation of the spark plug insulator skirt, the higher the calorific value. The stronger the balance between heat absorption and heat dissipation, the lower the calorific value of the hot spark plug and the higher the calorific value of the cold spark plug.

Generally, engines with high power and large compression ratio use cold spark plugs with high calorific value.

Conversely, engines with low power and low compression ratios use thermal spark plugs with low calorific value. Generally, the selection of spark plugs is determined by the factory through product finalization experiments, and should not be replaced at will.

200 kilometers, it doesn't hurt to change one, pay attention to quality problems.

Things like spark plugs, you don't need to read the maintenance manual of the vehicle, according to personal experience, the spark plug of the original car is the best to use, as long as there is no acceleration weakness, idle instability can be changed without changing, do not move casually.

1. The oil is not forced.

When you're driving, if you notice weak acceleration or a noticeable abnormal shake of the engine after pressing the accelerator, it's probably due to a decrease in spark plug performance.

The deterioration of spark plug performance will lead to poor ignition, resulting in insufficient combustion or even lack of fire, at this time, one or more cylinders may stop working, so the engine will be sensational or unable to produce oil force.

2. The car trembles when waiting for the red light.

When you stop and wait for a red light, you can pay attention to the working status of the engine, if the engine shakes significantly when idling, it may also be a spark plug problem.

Of course, the obvious shaking of the engine is not necessarily due to the spark plug Changno problem, but also due to the aging of the machine floor pads or excessive carbon deposit. In this case, it is advisable to go to a repair shop to find out the root cause of the problem.

3. Difficulty in starting or sudden flameout.

If the engine is difficult to start, it is obvious that there is a problem with the ignition, if the reason for the general difficulty of ignition in the winter burial season or poor engine maintenance can be ruled out, then it can be considered whether there is a problem with the spark plug.

If there is an unexplained flameout, it is likely to be caused by more than two cylinders stopping to work, and this situation is likely to be a problem with the spark plug.

The spark plug needs to be checked when the vehicle has the following fault phenomena:

After the spark plug works for a period of time, the electrode will have too large a gap and ablation, which will cause the loss of vehicle power, weak acceleration, fuel consumption, difficulty in starting, and in serious cases, the engine lacks cylinders, the vehicle shakes, and even causes damage to the engine.

2.After replacing the new spark plug in time, the vehicle can reduce the loss of power, so that the engine can output the original power, according to the local environment and oil conditions.

3.Common aging phenomena of spark plugs are: carbon deposits or sediments; The electrode is melted or corroded. The spark plug does not look very old on the outside, but it is irreversible on the inside.

No. It is ignited by a power generation that is repeated by an electric board.

Basic structure of a spark plug:

The insulator must have good insulation and thermal conductivity, high mechanical strength, and be able to withstand high temperature thermal shock and chemical corrosion. The housing is made of steel. The dimensions of the hexagonal threads of the housing have been incorporated into the ISO international standard.

The spark plug electrode consists of a center electrode and a side electrode, and the spark gap between the two is the spark gap. The size of the clearance directly affects the starting, power, working stability and economy of the engine. A reasonable gap is related to the ignition voltage.

The electrode material must have good resistance to electrical erosion (spark ablation) and corrosion (chemical-thermal corrosion), and should have good thermal conductivity. Between the central electrode and the wiring screw is a conductor glass sealant, which must be able to conduct electricity and withstand the high pressure of the combustion of the mixture, while ensuring its tightness.

The role of the spark plug is to create an electric spark that is used to ignite the gasoline in the engine cylinder. Spark plugs are divided according to the electrode material, including nickel alloy, silver alloy and platinum alloy.

The structure of the spark plug is made of a slender metal electric plate through a ceramic material with insulating function, and there is a metal shell around the lower part of the insulator, which is screwed on the cylinder head in a screw way, and an electrode is welded at the bottom of the metal shell to form a grounding effect with the automobile body. In addition, the ends of the electrodes** must be separated by a small discharge gap. The high-voltage current from the distributor will pass through this ** electrode to conduct electricity, and then discharge in the discharge gap at the bottom end, at this time the spark plug plays a role to generate an electric spark and ignite the mixture, and the engine will get power and output power.

It can be seen that the spark plug is used to ignite the gasoline mixture gas in the engine cylinder, and works under the bad bar of high temperature and high pressure, and is one of the wearing parts of the gasoline engine, which plays a very important role in the operation of the engine, and whether the car is fuel-efficient or not, whether the engine runs smoothly or not, has a great relationship.

Discharge for internal combustion engine ignition operation, spark plug multi-arc is good.

Carbon deposits and fragmentation of the tip of the insulator and oily deposits on the spark plugs typically occur. Normally, the service life of spark plugs is 15,000 km, and the service life of long-lasting spark plugs does not exceed 30,000 km. However, many car owners' spark plugs often have such and such problems, and their normal service life cannot be achieved.

Spark plug ablation When the owner finds that the tip 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. Symptom 1:

The electrodes are melted and the insulator is white Diagnosis: This phenomenon indicates that the temperature inside the combustion chamber is too high. This can be caused by too much carbon build-up in the combustion chamber, which causes the valve clearance to be too small, which can further lead to overheating of the exhaust valves or poor cooling of the unit.

When the spark plug is not tightened according to the specified torque, the electrode will melt and the insulator will appear white. Symptom 2: Rounding of the electrodes and scarring of the insulator Diagnosis:

This indicates that the engine is prematurely ignited, which may be caused by the early ignition time or the high octane number of gasoline and the calorific value of the spark plug. Symptom 3: Fragmentation of the tip of the insulator Diagnosis:

In general, knock combustion is the main cause of insulator rupture. Ignition too early, low octane number of gasoline, and high temperature in the combustion chamber can all lead to engine knock combustion. Symptom 4:

There are gray-black stripes on the top of the insulator Diagnosis: The appearance of such streaks indicates that the spark plug has leaked, and the owner needs to replace it with a new part unconditionally. Deposits on spark plugs 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 not work properly. 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 problem with other mechanical parts of the vehicle. Symptom 1: Oily deposits on the spark plug Diagnosis:

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 stuck to the spark plugs of the individual cylinders, it is an indication that the cylinder has spilled oil.

Generally speaking, when the air filter and ventilation are clogged, the cylinder is very prone to oil jumping. Symptom 2: Black deposits on the spark plug Diagnosis:

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.

The main manifestations of spark plug failure are lack of cylinder, low and unstable idle speed, or even failure to start when the ignition is turned off, accompanied by black exhaust gas; Weakness, the car is weak when starting or driving at high speed to refuel, the refueling is not thorough, and the acceleration is slow accompanied by sudden sound and black exhaust; Fuel consumption increases, that is, the combustion is inexhaustible, and energy is wasted; Serious knocking on the cylinder, mostly due to excessive carbon deposits, and even the resulting rupture of the porcelain insulator, such a phenomenon will directly affect the life of the engine.

1. Spark plug ablation.

Solution: Replace the spark plug.

2. There is sediment on the spark plug.

Solution: Clean the spark plugs.

The life of the ordinary spark plug is 20,000 kilometers, and it can still be used after more than 20,000 kilometers, but it is recommended not to exceed 40,000 kilometers, otherwise the ignition efficiency will decrease, resulting in a decrease in engine power;

2. The life of a single platinum spark plug is 5-80,000 kilometers, which needs to be replaced regularly, and the performance of a single platinum spark plug decreases as normal anode, cathodic ablation, ignition gap change, etc.;

3. The life of the iridium spark plug is 50,000 kilometers, and it is manifested as cathodic ablation when the performance is reduced, resulting in the change of ignition gap and the decrease of stability, so it is recommended to replace it regularly;

4. The life of iridium platinum spark plug is 8-100,000 kilometers, and when the performance declines, it is usually manifested as the aging of the ceramic insulation part, and the cylinder pressure decreases due to air leakage, the power is insufficient, the fuel consumption is increased reluctantly, and the efficiency is worse, so it is recommended to replace it regularly;

5. The life of the double iridium spark plug is theoretically more than 100,000 kilometers, which is the best performance of the spark plug at present.

The spark plug, commonly known as the nozzle, is used to discharge the pulse high-voltage electric discharge from the high-voltage wire (nozzle wire), break through the air between the two electrodes of the spark plug, and generate an electric spark to induce the mixed gas in the cylinder. There are three main conditions for high-performance engines: high-energy and stable sparks; Mix homogeneously mixed gas mixture; High compression ratio.

You can see the importance of the spark plug.

It is often heard that ordinary nozzles, platinum nozzles, and iridium nozzles are actually special names for the different materials of spark plug electrodes. The original spark plugs of general automobiles, whose electrode materials are made of nickel-manganese alloy (i.e., ordinary nozzles), are generally inspected or replaced after 2-30,000 kilometers or 1 year. Platinum spark plugs, on the other hand, can be replaced within 100,000 kilometers without inspection, and the more recent iridium metal spark plugs can also achieve this level.

This brings great convenience to the car, but here is a reminder that if you do not specifically state when repairing the engine, the repair shop will not replace you with a platinum spark plug, because an ordinary spark plug is only a few dozen yuan, and the original platinum products are at least hundreds (generally only Ben, Bao and other high-end cars are equipped with platinum spark plugs), so you must keep in mind the maintenance time limit of ordinary spark plugs, and check from time to time (nothing more than color, spark plug gap, etc.).

The price of platinum and iridium spark plugs is relatively expensive, after all, is it a rare metal! In fact, they are very small, only a small point is welded on the tips of the two electrodes, but don't underestimate this little. Why use rare metals, as mentioned earlier, first of all, durable.

When the cylinder is working, the mixture compression and combustion produce extremely high temperature and pressure, so that the temperature of the spark plug electrode is as high as about 900 °C. Because the melting point of silver and gold is too low, it cannot be used as an electrode material, while nickel has a melting point close to 1500 °C and is cheap, so it is widely used. White gold, on the other hand, is melted at close to 2000°C, and its stability and resistance to ablation are naturally better than nickel.

The newly emerged iridium material has a higher melting point than platinum, so it is more suitable for high-performance engines for long periods of time and at high speeds. In addition, the chemical stability is the essence of rare metals, so platinum and iridium can still provide punctual and strong sparks under high temperature and high pressure at extremely high speeds. It is important to know that in this extreme situation, ordinary spark plugs are very likely to emit unstable, unpunctual sparks, and even "misfire", which greatly reduces the work of the engine.

Once you understand why you should retrofit your high-performance spark plugs, you should also be reminded not to blindly follow the trend. To change the spark plug, you need to link the situation and usage habits of your car. It is definitely good to change platinum spark plugs, you get what you pay for, whether you need to measure it yourself.

And iridium spark plugs are more expensive, do you often go to "drag racing"? If not, a good platinum spark plug is no worse than an iridium one, and there is no need to waste money.