Is the engine jitter normal in the new car?

Speaking of car jitter, it can be said that it is a cliche, but jitter only occurs in some old cars. However, it was not long before the new car was mentioned, and it was found that there were many phenomena of jitter when the car was idling. Some car owners are particularly sensitive, and even a slight shaking at idle speed will make them feel uncomfortable. As we know, carbon deposition in the throttle, as well as the failure of spark plugs, oxygen sensors, ignition coils and other parts will cause idle jitter. However, the new car can basically eliminate the above faults. After all, there is no possibility of carbon deposition in new cars, and there are fewer failures of spark plugs, oxygen sensors and ignition coils in general new cars. What we need to do is to accurately judge whether this jitter is a fault or a normal phenomenon. If it is a fault, we need to use Sambo to solve it as soon as possible. It is a foregone conclusion that there is some slight jitter when leaving the factory. The congenital vibration of 4-cylinder engine is not small, but 3-cylinder engine will be more serious. Adding a balance shaft can indeed offset some mechanical vibration, but it is not surprising that the congenital vibration of the engine is introduced into the cab to attract the driver's attention. Generally speaking, the more cylinders, the smoother the engine operation, but it also means more fuel consumption and higher price.

Idle jitter can also be used as an engine quality index, so all major automobile manufacturers are taking the suppression of idle jitter as an important key project, because it will directly affect the comfort of consumers. Not all engine idle jitter is a fault, and it is actually easy to judge whether it is a fault: first, look at the severity of jitter, even if the jitter of three-cylinder and four-cylinder engines is in the running-in period, if it is not deliberately paid attention to and habitually ignored for a long time, the jitter amplitude of cylinder-missing nature will be great; The second is to see whether the idle jitter is intermittent and regular, and the irregular jitter of the car must be a fault; Third, during the shaking process, the idle speed is unstable. If the speed indicator swings up and down when idling, it means that there is something wrong with this car and it needs to be checked.

In addition, it is necessary to observe whether the jitter mainly occurs in the cold car environment or the hot car environment. Under normal circumstances, the jitter will only become more and more slight with the increase of water temperature, and the jitter is also the largest when the car is cold. The experience of four-cylinder turbocharged engines is often particularly obvious. If the jitter does not decrease after the hot car, it means that there is a greater possibility of a problem with this car. Before all the reasons are eliminated, it is still necessary to determine whether the refueled product is completely ok, because the added fuel is poor, the new car will also have obvious jitter, not to mention the quality problem of the new car.

Most of the slight shaking of the new car is normal. After all, it is a mechanical and electrical product, which vibrates when the machine is running. This situation is hard to avoid, and it is unrealistic not to shake at all. If the jitter exceeds the normal range or the jitter is completely irregular, it indicates that there is something wrong with the engine; If it is only a slight tremor that can be felt, there is no need to be picky.