What items do you need to do for 20,000 km car maintenance? Do you need to clean up carbon deposits?
In addition to oil change, there will continue to be the following new projects: cleaning the throttle injector, balancing the four-wheel rotor, disassembling and replacing the air conditioning filter element, and cleaning the three-way catalyst. Generally, this new project will not pass the test. When the delivery list is issued, the receptionist will strongly recommend it to you. According to their work experience, most cars should do this new project according to this kilometer. Some receptionists will introduce you all to them, and some may selectively ask you to strongly recommend one or two. Strictly speaking, whether it needs to be done must pass the test. Because the condition of a car is different, the usual application occasions are different. Some cars must be done and some cars don't need to be done.
First of all, look at cleaning the throttle injector, which can also be called cleaning carbon deposits. This project is the most expensive, with expensive labor and time limit. This is a new project that varies from car to car and must be checked before it can be confirmed. If it is checked, only the electronic throttle is generally checked, and the opening of the electronic throttle is checked by a computer. If it is too large, confirm that there is more carbon deposit and it must be cleaned up. However, the intake system and fuel injectors are invisible and basically not checked. As long as the electronic throttle is dirty, it will be proposed to clean it at the same time. Some cars with more than 20,000 kilometers are really dirty, but some are neat, depending on the application of the car. A fast car must not get dirty easily and it doesn't need cleaning. If there are many congested roads or cars with short travel intervals are generally dirty, it is best to wash them.
For most cars, the 20,000-kilometer electronic throttle, air intake system and fuel injector don't all need to be cleaned, just need to clean the throttle. This place is dirtier and more harmful, and the cost of cleaning the throttle is not high. The carbon deposit in the intake system, fuel injector and its master cylinder can be cleaned together until the throttle valve must be cleaned next time, which can achieve the actual effect of cleaning without spending a lot of money. Similarly, the three-way catalytic converter does not need to be cleaned. As long as there is no common fault in the car, it is recommended not to clean it from beginning to end. Unless you have a fault code, or the trial end time is tight, you can also clean it up.
There are also two new projects, four-wheel exchange balance and replacement of central air conditioning core, to be done. In order to make the brake disc wear more symmetrical and increase the tire life, it is necessary to do four-wheel interchange over 20 thousand kilometers. In 4S garage, general exchange and balance should be carried out at the same time. In fact, the central air-conditioning core must be replaced many times. As easy to get dirty as air filtration. After a summer or a winter, if the local natural gas environment is not good, it will look dirty, and it must be removed and replaced immediately, otherwise it will endanger everyone's physical and mental health, but it will not harm the car. So it is very likely that it will need to be replaced within 20 thousand kilometers. If you feel that the exhaust air volume is getting smaller or the smell is heavy, you can remove it and check it. Most cars just need to be disassembled. They all seem dirty. It is recommended to disassemble and replace it frequently.