What Causes Engine Shaking After Car Shutdown?

[Rodrigues]

Car engine shaking after shutdown can be attributed to the following reasons: 1. A dirty engine throttle or excessive carbon buildup on the fuel injector. During cold starts, the gasoline sprayed by the injector may be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture and difficulty starting. 2. Poor performance of the ignition system, including spark plugs, high-voltage wires, and ignition coils. 3. Abnormal fuel supply pressure, incorrect intake pressure values, or malfunctioning sensors. Solutions for engine shaking after car shutdown include: 1. Cleaning the fuel system and inspecting the idle speed control valve to remove carbon deposits. 2. Checking the spark plugs for excessive carbon buildup and replacing them if necessary. 3. Inspecting the fuel pressure and replacing faulty components.