What are the over-maintenance behaviors that cause injury to the car?
After reading the following answers, basically copied and pasted over, there is no nutrition. Let me say a few things that you don't know.
1. Excessively frequent cleaning of throttle valves
I saw a car internet celebrity on the Internet, saying that the engine's throttle, whether dirty or not, must be cleaned once for 20,000 kilometers. This is a flawless car without limits! The engine throttle is just a passage through the air, as long as it's not too dirty, don't worry about it. The carbon deposit on the throttle flap has no effect on the engine intake, but it just looks a little dirty. What really has an impact on the intake is the carbon deposit on the inner wall of the throttle, which affects the opening of the throttle, causing the engine to idle and shaking, and that's it.
Everyone went to the repair shop to wash the throttle, the repairman removed the throttle, and used the carburetor cleaner to clean the throttle inside and out, and the light shone brightly, in fact, this is completely unnecessary. To clean the throttle, we only need to remove the carbon deposit on the inner wall of the throttle. Spray the throttle cleaner on the non-woven fabric and gently wipe the inner wall of the throttle. Be careful not to wipe hard, gently wipe to dissolve the carbon deposit and erase it.
If the throttle is cleaned frequently, the throttle will become more and more prone to carbon deposit and have a reduced service life. Many people may not know that there is a special coating on the inner wall of the throttle valve and the throttle shaft. This coating is self-lubricating, allowing the throttle shaft to run freely and reducing the chance of carbon deposits deposited on the inner wall of the throttle. If excessively frequent cleaning, especially with inferior throttle cleaners, or even with carburetor cleaners, this coating will be destroyed, resulting in more and more serious carbon deposition in the throttle, and the cleaning interval is getting shorter and shorter, which eventually leads to the throttle shaft running stuck, and only the throttle assembly can be replaced. Therefore, the principle of throttle cleaning is "asymptomatic no cleaning", and must be cleaned with high-quality throttle cleaning agent.
2. Excessive frequent blowing of air filters
The air filter is used to filter the impurities in the air to avoid various impurities, hard particles, etc. from entering the engine wear cylinder. Larger impurities in the air will get stuck in the filter paper fibers of the air filter and cannot enter the engine, while smaller impurities will pass through the filter paper, which is the so-called filtration precision. In fact, after the car is used for a period of time, the air filter paper is stuffed with impurities, which objectively play a role in improving the accuracy of air filter filtration.
If we frequently blow the air filter and blow off these impurities, the filtration accuracy of the air filter will be reduced. In particular, our incorrect blowing filter (blowing from the front to the reverse), and even the larger impurities will be blown into the filter paper, destroying the filter paper fibers, resulting in a permanent decline in the filtration accuracy of the air filter and cannot be recovered. This may lead to larger impurities entering the engine cylinder, resulting in abnormal cylinder wear and reducing engine service life. Therefore, the air filter is generally 5,000 kilometers blow once, 10,000 kilometers to replace. If the local air quality is too poor and there are too many impurities in the air, it is best to blow once for three thousand kilometers and replace it for five thousand kilometers.
3. Excessively frequent cleaning of the engine
Some 4s shops require the owner to clean the engine almost every time they maintain and change the oil, which is completely unnecessary. The oil used in the engine has a cleaning function, as long as it is used normally, the oil quality is good, and the engine will not be too dirty. If engine cleaners are often used, these cleaners have a certain degree of corrosiveness, which will swell the rubber, resulting in the aging of the oil seal and premature oil leakage of the engine. Therefore, as long as we maintain it on time and use good quality oil, we do not need to clean the engine.
4. Excessive frequent cleaning of carbon deposits
Now cleaning carbon deposits has almost become the "profit cow" of the repair shop, the cost is extremely low, the fee is extremely high, and it is the favorite of the repair shop. Therefore, they will exaggerate the harm of carbon deposition, what "carbon deposition is the cancer of the engine", "carbon deposition is the root cause of engine failure", etc., so that the majority of car owners and friends often clean the engine carbon deposition to ensure that their profits are continuous.
So is engine carbon deposit really that scary? In fact, any engine inevitably generates carbon deposits, and slight carbon deposits will also enhance the performance of the engine, only serious carbon deposits will reduce engine performance, and even lead to burning oil. Cleaning carbon deposits in the repair shop, whether using walnut sand or dry ice, will cause some damage to the engine, and even cause the engine to pull the cylinder. The cleaning effect of hanging bottles and adding cleaning agents is extremely limited.
Therefore, we should not talk about carbon deposition and discoloration, carbon deposition is not so terrible, and it does not have to be cleaned frequently. In the process of daily use of the car, we must use high-quality oil, add qualified fuel, coupled with good driving habits, you can reduce the formation rate of carbon deposits, and even completely eliminate the need to clean carbon deposits.