What Causes Vehicle Body Shaking at Speeds of 70-80 km/h?
2 Answers
The causes of vehicle body shaking at speeds of 70-80 km/h are as follows: 1. Ignition system issues: Check the working condition of spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or inadequate spark plug firing can lead to such symptoms. 2. Unstable oil pressure: Even after cleaning engine carbon deposits, throttle valve, replacing oil pads and spark plugs, if the body still shakes at idle, it is recommended to visit a 4S shop to check the fuel supply pressure and intake pressure sensor. Abnormal fuel pump supply pressure or incorrect values and poor performance of the intake pressure sensor can cause body shaking. 3. Aging engine mounts: Engine mounts act as the shock absorption system for the engine, absorbing minor vibrations during operation. If the engine mounts are faulty, these vibrations can be transmitted to the steering wheel and cabin, causing shaking at idle. 4. Severe engine carbon deposits: The most common cause of vehicle shaking is excessive dirt on the throttle valve or too much carbon buildup in the fuel injectors.
I've experienced this too. When driving at speeds between 70 to 80 km/h, the car feels like it's wobbling. At first, I thought it was due to uneven roads, but later realized the issue was with the tires. If the tire balance isn't properly adjusted or the tire pressure is uneven, it can easily cause shaking at this specific speed range because the tire rotation frequency resonates. Additionally, uneven tire wear or wheel axle deformation can worsen the problem. I recommend going to an auto repair shop for a wheel balancing check first—it's simple and inexpensive, and usually solves most of the issue. However, if the shaking is accompanied by unusual noises or steering difficulties, it might indicate loose components in the drive shaft or suspension system, such as worn ball joints or aging shock absorbers. In that case, they should be replaced promptly to avoid the risk of losing control at high speeds. Remember, regular tire maintenance can prevent this problem—check tire pressure and wear condition at least every six months.
