Is it normal for the Levin to jerk when starting?
2 Answers
It is not normal for the Levin to jerk when starting. The reasons for jerking during startup may include severe engine carbon deposits, ignition system issues, or unstable oil pressure. Below are the causes and solutions for jerking during startup: Severe engine carbon deposits: The most common cause of car shaking is a dirty throttle or excessive carbon deposits in the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold start injector can be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. 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 lead to such faults. Unstable oil pressure: If you have already cleaned the engine carbon deposits and throttle body, it is recommended to visit a 4S shop to check whether the fuel supply pressure and intake pressure sensor are functioning properly. Abnormal fuel pump supply pressure or incorrect readings and poor performance of the intake pressure sensor can both cause the car to shake.
As a long-time Corolla owner, I've noticed slight jerking during acceleration is quite common, especially during cold starts or stop-and-go traffic. My automatic CVT transmission has inherent slight delay - the belt needs warm-up time to adjust gear ratios, so occasional low-speed shuddering is normal until fully warmed up. However, if every start feels violently shaky like body rocking, stay alert. Possible causes include contaminated/low transmission fluid (solved mine with fluid change) or outdated software needing logic optimization. Monitor the jerk frequency - minor cases are within tolerance, but if severely affecting drivability, visit professionals promptly to prevent major transmission repairs. Safety first, and regular fluid maintenance is crucial.
