What Causes Idle Shaking in a Four-Cylinder Car?

[SanGrant]

Here are the specific reasons for idle shaking in a four-cylinder car: Clogged Catalytic Converter: A clogged catalytic converter can lead to poor exhaust flow, reduced power, increased fuel consumption, and in severe cases, engine shaking or even stalling. Faulty Spark Plugs: Faulty spark plugs can cause idle shaking, noticeable power loss, increased fuel consumption, and may result in a series of symptoms like engine misfiring (such as backfiring, black smoke from the exhaust, and severe vibration). Carbon Buildup in the Throttle Body: Carbon buildup is a major factor affecting throttle body performance. Prolonged neglect of throttle body cleaning can cause errors in throttle opening and allow air with impurities to enter the engine cylinders, leading to abnormal engine operation.