Why Does a Car Shake When Starting?

[EmmanuelAnn]

Reasons why a car shakes when starting: Equipment malfunctions, such as issues with the ignition coil, water temperature sensor, spark plugs not working, or cylinder misfires, can cause noticeable shaking, sometimes resembling the car wobbling. Such shaking can be detected at a repair shop, but for occasional occurrences, even the repair shop might not identify the cause. Another scenario is excessive carbon buildup in the intake system, leading to an overly rich air-fuel mixture during startup and abnormal combustion. The solution is to disassemble the intake tract and thoroughly clean the throttle body, intake tract, and the base of the intake valves, where carbon buildup tends to be severe. Cars that have traveled over 20,000 km will develop carbon deposits, though the extent varies.