What Causes Vehicle Acceleration Shaking?
2 Answers
The reasons for vehicle acceleration shaking are as follows: 1. The most common cause of car shaking is a dirty throttle or excessive carbon deposits on the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold start 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. In this situation, the car will only start easily once the carbon deposits have absorbed enough gasoline to become saturated. 2. After starting, the gasoline adsorbed on the carbon deposits will be sucked into the cylinder by the engine's vacuum for combustion, making the air-fuel mixture too rich. The engine's combustible mixture alternates between being too lean and too rich, causing idle shaking after a cold start. 3. The lower the temperature, the more fuel is needed for a cold start, and the presence of carbon deposits will significantly affect whether the cold start proceeds smoothly. Cleaning the fuel system can help resolve this issue.
In my decades of driving, I've encountered many cases of vehicle acceleration shuddering, with the most common being ignition system issues. When spark plugs are aged or severely carbon-fouled, the engine doesn't fire smoothly, leading to shuddering during acceleration; faulty ignition coils can cause similar symptoms. Secondly, fuel system malfunctions are critical—clogged fuel injectors or insufficient fuel pump pressure can cause uneven fuel injection, resulting in shuddering. Then there's the drivetrain: unbalanced tires or worn CV axles can make the entire body shake, with the steering wheel vibrating too. A clogged air filter or damaged engine mounts may also cause shuddering. Letting this problem persist is unsafe, especially at high speeds, as it may lead to stalling or loss of control. That's why I always remind my old friends to regularly inspect these components—don't wait until a major repair is needed to regret it.
