Why does the car shake violently after starting?

[StAustin]

The most common reason for severe shaking after starting the car is a dirty throttle body or excessive carbon buildup in the fuel injectors, which causes the engine's combustible mixture to fluctuate between lean and rich, resulting in idle shaking after a cold start. Below is relevant information: 1. There are many reasons for car shaking after starting, such as a dirty air filter, broken high-voltage wires, abnormal water temperature, clogged fuel injectors, carbon deposits, and oil sludge blockages, all of which can cause the car to shake. 2. Dirty air filter: The air filter is designed to protect the engine and reduce wear. It is generally replaced every 10,000 kilometers. If not replaced in time, insufficient air intake can cause low idle speed, leading to engine shaking. Simply replacing the filter can solve the problem. 3. Broken high-voltage wires: Broken high-voltage wires refer to the interruption of the wire core, which can affect ignition and cause engine shaking. Use a multimeter to measure the resistance and replace the one with significantly higher resistance.