What Causes Shaking During Automatic Transmission Car Startup?
2 Answers
Shaking during the startup of an automatic transmission car may be caused by the following reasons: 1. The throttle is too dirty, causing uneven air intake and resulting in shaking. 2. Poor fuel delivery, leading to insufficient fuel supply at low throttle and causing uneven engine cylinder operation and shaking. 3. Abnormal transmission operation. Below is more information about automatic transmission cars: 1. Introduction: Automatic transmission cars generally use an automatic transmission (AT) to regulate speed. While driving, the control system of the automatic transmission automatically selects the appropriate gear based on the engine's speed and load, replacing the driver's subjective judgment of timing and gear shifting. 2. Operational characteristics: When driving an automatic transmission car, the driver only needs to control the accelerator pedal. The computer analyzes signals such as engine throttle opening and vehicle speed collected by sensors to automatically control gear shifting or engage different gears.
As an experienced driver, I've encountered the issue of automatic transmission jerking during startup several times. Generally, it might be caused by unstable engine idle speed, such as carbon buildup on spark plugs or clogged fuel injectors, which can lead to shaking during ignition. There can also be problems with the transmission—dirty or insufficient transmission fluid can affect smooth starts. I remember one instance where the shaking was due to unbalanced tires combined with worn axle shafts, causing a humming vibration while driving. If ignored, it can damage the engine or drivetrain, leading to costly repairs. I recommend checking the tachometer for significant fluctuations after startup, inspecting the transmission fluid level and tire pressure, and not letting small issues escalate. Safety comes first when driving, so it's best to address any problems promptly at a professional shop.
