What is the solution for the car shaking left and right at 40 km/h?
2 Answers
The solution for the car shaking left and right at 40 km/h is to clean the carbon deposits in the engine. Severe carbon buildup in the engine can cause the throttle valve to become dirty or the fuel injectors to accumulate carbon deposits, preventing the fuel in the combustion chamber from burning completely and affecting power transmission, which leads to car shaking. An engine is a machine that converts other forms of energy into mechanical energy. When there is excessive carbon buildup in the throttle valve, the gasoline sprayed by the cold-start fuel injector will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. Only after the carbon deposits are saturated with gasoline will the engine start more easily. After starting, the gasoline adsorbed on the carbon deposits will be drawn into the cylinder by the engine's vacuum suction for combustion, making the air-fuel mixture leaner, which can cause shaking during idle.
When the car shakes left and right at 40 km/h, I encountered a similar issue when I was young and didn't know much about cars, but later fixed it myself. First, check if the tires have abnormal wear or imbalance, and whether the tire pressure is consistent on both sides—uneven pressure can cause unstable driving. It's recommended to prioritize getting a tire dynamic balance at a reliable auto shop; it's inexpensive and takes little time to improve the issue. If that doesn’t help, then inspect the suspension system—damaged control arms or tie rods can cause shaking, and sometimes faulty wheel bearings may produce clicking sounds—don’t overlook small details. Develop good habits: check tire pressure monthly and slow down on rough roads to avoid damaging components. Long-term shaking affects handling safety, increasing the risk of blowouts or loss of control. Addressing it early saves time and effort.
