What Causes Car Shaking at Low Speed but Normal at High Speed?
2 Answers
Car shaking at low speed but normal at high speed is mainly due to throttle valve carbon buildup. Throttle Valve Carbon Buildup: As the car is used over time, the intake tract may become clogged, and carbon deposits or oil may accumulate in the throttle valve, leading to unstable idle speed or even low idle speed. Throttle Valve Cleaning Interval: It is generally recommended that car owners clean the throttle valve every 20,000 to 40,000 kilometers. However, this is only a reference value. The specific cleaning interval should be based on the individual's driving environment, the type of engine oil used, the frequency of air filter replacement, and driving habits. If symptoms such as insufficient engine intake, unstable idle speed, sudden deceleration when releasing the throttle, reduced power, difficulty starting, or increased fuel consumption are noticed, it may indicate that the throttle valve needs cleaning.
I recently experienced severe shaking of my car at low speeds, especially during traffic jams or when starting, feeling the body swaying left and right, making my palms sweat. However, once on the highway at higher speeds, everything became normal again, driving as smoothly as new. This is usually related to unbalanced tires or bulging tires. When the wheels rotate unevenly at low speeds, they shake, but at high speeds, the rotation becomes smoother. It could also be an issue with the drive shaft, such as wear on the bearing connected to the front wheels, causing power transmission issues at low speeds. Additionally, aging spark plugs or misfires can cause minor problems at low speeds when the engine runs slower, while high speeds make everything run smoothly. It's best to quickly find a professional auto repair shop to check the wheel balance and tire pressure to prevent the problem from worsening. If the steering fails, it could be dangerous. Remember the last time I delayed repairs, the shaking became worse, and I ended up spending more money to fix it. Safety first!
