What Causes Jerking When Accelerating at Low Speeds in a Car?
2 Answers
The reasons for jerking when accelerating at low speeds in a car include damaged solenoid valves and transmission issues. The specific causes and solutions are as follows: Damaged Solenoid Valves: If there is sludge in the transmission fluid circulating within the transmission, blocking the oil passages in the valve body, it can lead to jerking issues. Over time, this can cause the transmission to overheat, experience shocks, slippage, and a series of other transmission problems. The solution is to repair the solenoid valves. Transmission Damage: Persistent dirt and impurities inside the transmission, especially when accumulated in the valve body, can form blockages, preventing effective regulation of oil pressure. This results in jerking, shocks, and slippage. The solution is to perform maintenance and repairs.
There's a jerking sensation when stepping on the throttle at low speeds. I've repaired many cars with this issue. Usually, it's caused by aged spark plugs failing to ignite properly, leading to uneven combustion of the air-fuel mixture and engine vibration. The fuel system is also crucial—dirty or clogged fuel injectors can cause uneven fuel spray, resulting in insufficient power. Unstable automatic transmission fluid pressure or worn clutches are common problems, especially when the transmission isn't synchronized during low-speed acceleration. Excessive carbon buildup affects air intake, which is more likely if the car is driven frequently in the city without maintenance. The ECU receiving incorrect sensor signals can also cause jerking. I recommend first scanning for error codes with an OBD tool, then starting with simple fixes like replacing spark plugs and cleaning the throttle body. Regular maintenance can prevent this, such as changing the air filter and using fuel system cleaners. Safety first—if the jerking is noticeable, take it to a professional shop for inspection.
