Causes of body jitter during automobile acceleration

When the car accelerates, especially after the third gear or above, the car body will vibrate and vibrate, and when it slides in neutral, the car body will also vibrate and vibrate. When the vehicle speed is increased to 75 kilometers, the sound of the engine is louder, and the resonance in the car is particularly clear, but it is very harsh, which is also the reason for the body jitter and vibration during acceleration.

Causes of body shake and vibration during acceleration;

When driving, the engine of the car will shake and vibrate normally, and sometimes it will not start. It may be that the throttle is too dirty, and there is too much carbon deposited in the fuel injector and air intake. When the car is cold, the carbon deposit will adsorb some fuel. If the fuel does not completely enter the cylinder for combustion, it will cause the symptoms of unstable idle speed and difficult start.

2. When driving at a certain speed at high speed, the steering wheel can obviously feel jitter or jump, but it is not obvious at low speed. I think there are many problems that will cause the car engine to shake. Here, we need to eliminate the abnormal jitter caused by engine failure, which will also happen at most low speeds.

Solutions to the body shake and vibration during automobile acceleration;

If the car appears obvious jitter during acceleration, you can visually check whether the balance lead block on the wheel rim is missing or whether the wheel hub is obviously deformed. If there is no doubt about the above places, you need to turn to professional testing equipment. Due to the slight deformation of the steering rod, suspension and hub, we can't distinguish it with our eyes.

First, check whether the upper and lower half shafts are bent; Secondly, disassemble and check whether the inner walls of the upper and lower inner cages are worn and produce pits, which is mostly caused by the damage of the inner cages.

Modern cars are mostly front-mounted and front-driven, and the inner cages are mostly telescopic to adapt to the changes in the position of gearbox end and driving wheel when driving. After disassembly and inspection, it can be found that the inner wall of the inner cage is often in contact with the outer skin of the needle bearing, that is, the place where the torque is transmitted (the stress point) has formed a pit.

When the automobile accelerates rapidly, the engine gearbox assembly needs to do a slight rollover operation, which will change the position of the above-mentioned stress point, because there is a necessary included angle between the axial direction of the semi-axle and the axial direction of the inner cage, and the used stress point keeps reciprocating along the axial direction during the rotation of the cage. This is because

This force constantly pushes the car body to the upper and lower sides, that is, the above-mentioned sinking feeling appears, and the damaged inner cage or axle shaft is replaced.

It may also resonate, but tires are unlikely. This phenomenon depends on what kind of car it is, and the reasons for different cars are different. If it is a car, we should start to wonder whether the steering gear lever of the front suspension is lifted and whether the three fixed points of the triangular arm are lifted, so as to detect whether the dynamic balance value of the tire exceeds the maximum range (excessive deformation of the rim or tire), and check whether the engine is hoisted and whether the girder is cracked. If it is an off-road vehicle, in addition to detecting where it is.

Extended information:

There are two situations, cold start and hot start. Explain that the hot car refers to the engine water temperature of 90 degrees; Above.

Most of you can feel that when you start the car (commonly known as cold car) for the first time in a day or two, you will feel that the car will shake even more when the temperature is higher than the actual temperature. When the cold car starts, the engine speed will be higher than that when the hot car starts, and the high-speed duration will be longer.

Simply put, hot car is to make the engine and gearbox reach the best working temperature, which is related to the fluidity of fuel and the viscosity of lubricating oil. The speed of cold car is higher than that of hot car, and the high speed lasts for a long time, so that the automobile power system can reach the optimal working temperature as soon as possible. Of course, if you can't wait, you don't have to be stingy with gas money. You can also speed up the process by stepping on the accelerator.

Car shaking and vibration are also possible. Check the working conditions of spark plugs, high-voltage lines and ignition coils in the ignition system. Poor ignition of ignition system and spark plug will also affect such failures. This is the reason why the car body shakes and vibrates when accelerating. The car editor of this website gives a brief introduction to the friends. I hope I can solve the problem for my friends!

Million car purchase subsidy