Why Does the Engine Shake After Replacing Spark Plugs?

[Perry]

The reason for engine shaking after replacing spark plugs may be due to damaged or partially disconnected ignition wires when removing the spark plugs, resulting in abnormal ignition. Other possible causes include incorrect installation of the spark plugs (threads not aligned properly) or ignition wires not fully inserted. What is a Spark Plug: A spark plug is a crucial component of a gasoline engine's ignition system. It introduces high-voltage electricity into the combustion chamber and generates a spark across the electrode gap, igniting the air-fuel mixture in the cylinder. Main types of spark plugs include: Standard spark plugs, extended insulator spark plugs, electrode-type spark plugs, seat-type spark plugs, pole-type spark plugs, and surface-gap spark plugs. Effects of a Faulty Spark Plug: A damaged spark plug can directly cause ignition system leakage, increased fuel consumption, reduced engine power, and other issues. The most significant problem is difficulty in ignition, affecting the vehicle's normal operation. Severe spark plug erosion, such as tip scarring, electrode melting, or burning, indicates the spark plug is damaged and should be replaced.