What is the effect of spark plugs? How long does it need to change? How do you choose spark plugs? What is the symptom of the spark plug? This is a series of questions that some novice owners love to ask. There are spark plugs on gasoline engines, one cylinder and one, and individual high-speed gasoline engines have 2 spark plugs per cylinder. Although the spark plug is a small part, it is extremely important. The function of the spark plug is to introduce the pulse high voltage generated by the ignition coil into the combustion chamber, and use the spark generated by the electrodes to ignite the mixture to complete the combustion. Because of the different material of spark plug, the type of spark plug can be divided into common copper core, yttrium gold, platinum, iridium gold, platinum and iridium alloy spark plug. The service life of these types of spark plugs is different, the corresponding replacement mileage is also different, it is clear to distinguish it when choosing. Generally speaking, under normal use, the service life of ordinary copper core spark plug is 30 thousand kilometers, and the life span of the spark plug of precious metal is 6 to 90 thousand kilometers. The maintenance cycle of different car manufacturers is not exactly the same, so the specific more cycle should also be based on the regulations of the automobile manufacturer. . Do not extend the need to replace the machine. If it is found that the fuel consumption of the vehicle is increased, the spark plug can be considered, and the general repair plant will recommend a replacement at twenty thousand or thirty thousand kilometers, because the spark plug is not completely damaged, but the efficiency is reduced. In fact, this is determined by the quality of the spark plug. The ordinary spark plug can be changed 40 thousand kilometers, and platinum and iridium can be changed for 6~8 kilometers. If the spark plug is purchased on the auto parts or the electricity supplier website, it usually costs tens of yuan to one hundred yuan. To find a reliable repair shop to install, generally will charge about 20 yuan installation fee. The installation process is very short and can be seen in person in person, so it can save money and avoid the black heart repair factory to reuse the half new spark plug from other people's car. 1, real car inspection: it is best to operate under the guidance of professional personnel. The owner knows more about this common sense and is used to identify the maintenance advice of professional personnel. It is best not to do it yourself. The engine is running at idle speed, the spark plug is short circuited by a screwdriver, the engine speed and the noise are changed, the speed and the noise are changed obviously, which indicates that the spark plug is normal. When the speed and noise are not obvious, the spark plug is in an abnormal state. Unplug the spark plug, put it on the cylinder block, and test it with high voltage line. If there is no spark or weak spark, it indicates that the spark plug is creepage or not working. 2, observe the appearance of color: car owners can learn this method, in the maintenance personnel dismantling the spark plug can make their own judgement. (1) if it is brown or rust color, it indicates that the spark plug is normal; (2) if it is soiled oil, it indicates that the spark plug gap or oil supply is too much, the high pressure line short or circuit breaker; (3) if it is smoked black, it indicates that the spark plug is cold and hot or mixed gas, and the oil is on the oil. (4) (4) if there is a deposit between the top and the electrode and the deposit is an oil, it is proved that the cylinder oil is not related to the spark plug; if the sediment is black, the spark plugs carbon and the by-pass; the sediment is gray because the additive in the gasoline is overlaid with the electrode; (5) such as The spark plug is seriously ablated, the top appears scars, black lines, breakage, electrode melting and so on, which indicates that the spark plug has been damaged and must be replaced immediately. A spark plug is a small, seemingly unattractive part, but its function can be said to be very large, and it is a vulnerable part and needs to be replaced on a regular basis. Because of the problem of cost control, automobile manufacturers may not choose the best spark plugs, but they can ensure the normal operation of vehicles. When the vehicle enters the maintenance link, it will face the spark plug that has been chosen and renewed. At present, the popular brands of spark plugs are Bosch in Germany, Denso in Japan, NGK in Japan, AC German in the United States, and Autolite in the United States. When buying, check the different brands of spark plugs comparison table to avoid buying the wrong models. 1, Bosch: German imported spark plug, mainly used in summer, Folel, Geely, Mazda, prestige, Buick and other models, with strong corrosion resistance, high ignition reliability, long life and so on. NGK, imported spark plug in Japan, is mainly used in Bora, pachate, Teana, Huachen, BYD, and Beidou stars. It has the characteristics of good insulation, good thermal conductivity, strong air tightness, and strong resistance to hot flushing and so on. 2, DENSO, Japan imported spark plug, mainly used in Audi, Lexus, crown, Kost, big overlord, sea lion, coxda, Charlie, blue bird, Kay, the accord and other models, the ignition is reliable, the specifications are complete, the seal is better. 3, AC Deke, imported spark plug in the United States, mainly used in BMW, Porsche, Audi, Bentley, Junwei, Chevron, wind, blue bird, MITSUBISHI and other models, with strong corrosion resistance, heat resistance, antioxidant capacity and other characteristics. 4, Autolite, imported spark plug in the United States, mainly used in the accord, Kopacz, CRV, Odyssey, flying, TOYOTA, KIA, modern, morning, MITSUBISHI, Subaru, BYD, the Great Wall and other models, with strong power, oil consumption, long service life and so on. 5, Eyquem, imported spark plug in France, mainly used in Senna Seine, Picasso, Peugeot 307, triumphant, Chevron and other models, with reliable ignition, corrosion resistance characteristics, good performance price ratio. Of course, there are many high performance spark plugs for upgrading and upgrading vehicles, and some affordable domestic spark plug brands. Which type of choice should be selected according to the situation of their own vehicles. Different models of spark plug models, requirements, prices, replacement cycles are different, take our common model as an example: a new Santana spark plug is 56 yuan, Bosch brand, 4 for every 30 thousand km, a total of 224 yuan; Passat is 126 yuan, NGK brand, each replacement needs 4, manufacturer's suggestion Each 20 thousand kilometre is replaced once, with a total of 504 yuan; golf 6 is 70 yuan a, NGK brand, the manufacturer suggests that every 30 thousand kilometers change four, the total of 280 yuan; and the BMW 5 sparks plug is about 254, the Bosch brand for 50 thousand kilometers per 50 thousand yuan for 4, together is 1019. The above example is to select the different models and levels that are familiar to us. The brands and prices involved are designated by the manufacturers, and the owners can also choose according to their own needs in the future maintenance and maintenance. In the process of daily use of the car, the maintenance and replacement of the spark plug should be done well, and the specific "five Taboos" should be done, that is, avoid the cold and heat in the process of the spark plug, avoid the long term use, avoid the long-term clean up of the coke, avoid the random descaling, and avoid the fire. This will prolong the life of spark plugs and ensure the engine's economic and safe operation.