How to check the jitter of a rear wheel drive car in a certain speed range?

The main reason for the failure is the increase in carbon deposits in the throttle, intake tract, valve and other parts, which adsorbs some gasoline when the car is cool, and when the car is hot, these gasoline volatilize, and the mixture will be too thick when the engine is idling, resulting in unstable idle speed of the hot car. Therefore, you should not only check the throttle valve and idle motor, etc., but also check whether there is too much carbon and dirt in the intake tract, if there is too much, it will cause the cross-sectional area of the air channel to change, so that the control unit can not accurately control the amount of idle air intake, resulting in too thick or too thin mixture, so that the combustion is abnormal and causes the engine to shake. At the same time, it is also necessary to check whether the canister is faulty.

At the start, especially during rapid acceleration, all moving parts are at maximum load.

According to experience, if there is one or two sounds at the start, it is likely that the suspension of the rear drive axle will have a problem, such as the wear of the cable-stayed rod or towing arm rubber sleeve is seriously worn and leaked to the iron pin, or the rear axle fixing bolt is loose, causing the rear axle to move forward and move backward when braking, and it may be a shock absorbing spring plate for off-road vehicles.

The main thing is to check the suspension rear axle.

Check whether there are chassis parts, tie rods, tie rod ball joints, whether there is clearance in the steering machine, your car is tens of thousands of kilometers, brake shake your brake pads and brake discs, mainly brake discs, go check it.

Hello, check the dynamic balance of the tires of the vehicle, the degree of tire wear, the half shaft, the transmission shaft, the differential.

Hello, you go to do the tire dynamic balancing first. Four wheels. Check the chassis for any loose spots.

1. When all starts, especially when accelerating sharply, all moving parts are in the maximum load state.

According to experience, if there is one or two sounds at the start, it is likely that the suspension of the rear drive axle will have a problem, such as the wear of the cable-stayed rod or towing arm rubber sleeve is seriously worn and leaked to the iron pin, or the rear axle fixing bolt is loose, causing the rear axle to move forward and move backward when braking, and it may be a shock absorbing spring plate for off-road vehicles.

The main thing is to check the suspension rear axle.

This problem is usually caused by the body shaking due to the rapid loosening of the clutch when the gear is attached, and in other cases, it may also be caused by other parts of the driving system. Specifically, you have to go to the repair shop and let the professional master check it.

The main reasons for the high-speed oscillation of the car are: l. The positioning angle of the front wheel is inaccurate, and the toe is too large; 2. The air pressure of the front tire is too low or the tire is unbalanced due to repair and other reasons; 3. The front spokes are deformed or the number of tire bolts is unequal; 4. The installation of transmission system parts is loose; 5. The transmission shaft is bent, the dynamic is unbalanced, and the front shaft is deformed; 6. The shock absorber fails, and the front leaf spring rate is inconsistent; Frame deformation, rivet loosening, or front axle deformation. Diagnosis and elimination of high-speed oscillation fault of automobile

l. There are two situations of high-speed oscillation, one is that the oscillation becomes stronger with the increase of vehicle speed; The second is that there is oscillation at a certain higher speed period, which causes the steering wheel to shake. When judging, the drive axle is erected first, the front wheel is plugged with safety plug blocks, the engine is started and the high-speed gear is gradually shifted, so that the driving wheel reaches the final test oscillation speed. If both the body and steering wheel shake at this time, it is caused by the drivetrain.

Because the front axle of the front wheel is in a stationary state at this time, if the final test oscillation speed is reached, the car does not shake, the reason for the oscillation is that the front axle part of the car is faulty; 2. Check whether the positioning angle of the front wheel and the front wheel meet the requirements, and if it is inaccurate, it should be adjusted; 3. Set up the front axle to test the wheels, check the static balance of the wheels and whether the tires are too deformed. If necessary, a good wheel can be changed for a comparative test.

Hello, in this case, it is generally the front wheel to do a dynamic balance, and the latter is a problem with the half shaft.

Check whether the brake cylinder is back in place.