What Causes Shaking During Automatic Transmission Startup?

[Doreen]

Below are the reasons for shaking during automatic transmission vehicle startup: 1. Fuel system obstruction: Insufficient fuel supply at low throttle causes uneven cylinder operation, resulting in shaking. 2. Dirty throttle body: Uneven intake airflow leads to operational imbalance and shaking. When excessive carbon deposits accumulate inside the engine, the cold start injector's fuel spray gets largely absorbed by these deposits, causing an overly lean fuel mixture during cold starts and making ignition difficult. 3. Damaged high-voltage wires or spark plug failure causing cylinder misfire: This creates unstable engine operation and shaking. 4. Check whether the battery voltage is within specified range. 5. Abnormal transmission operation.