What Causes Severe Jerking in a Car?

[LaSamuel]

Severe jerking in a car may be caused by the following issues: 1. Power supply system: Spark plugs or ignition coils. If the high-voltage spark is weak, causing intermittent poor engine performance, it can result in jerking. 2. Fuel system: Fuel injectors. If the fuel injectors have carbon buildup, minor blockages, or poor atomization, it can easily lead to abnormal fuel injection and cause jerking. 3. Transmission: Impacts, jerking, or gear hunting are usually caused by a damaged valve body or dirty transmission fluid with internal impurities. Especially when dirt and impurities accumulate inside the valve body, blocking the pipelines, it can prevent effective regulation of oil pressure, leading to jerking, impacts, or slippage. Whether it's an automatic or manual transmission, if the engine mounts or transmission mounts are damaged, they won't provide cushioning when releasing the throttle, causing jerking. 4. Throttle: If the throttle is not cleaned for a long time, excessive carbon buildup can alter the throttle opening angle, resulting in jerking when releasing the throttle.