Why does the Corolla jerk and shake?

[Dana]

Corolla jerking and shaking is a normal phenomenon. The following are the reasons for car shaking: 1. Dirty throttle or excessive carbon deposits on the fuel injector: After the car starts, the gasoline adsorbed on the carbon deposits will be sucked into the cylinder by the engine's vacuum suction for combustion, which enriches the air-fuel mixture. The combustible mixture in the engine becomes alternately lean and rich, causing idle shaking after a cold start. Solution: Clean the fuel system and check if the idle control valve has carbon deposits that need cleaning. 2. Ignition system issues: Check the condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or inadequate spark plug firing can also cause such symptoms. 3. Unstable fuel pressure: It is recommended to visit a 4S shop to check the fuel supply pressure and the intake pressure sensor for normal operation. If the fuel pump's supply pressure is abnormal or the intake pressure sensor values are incorrect or malfunctioning, it can cause the car body to shake.