Why does the Lavida Plus engine shake when the hood is opened?

[McMiguel]

The most common cause of engine shaking is a dirty throttle body or excessive carbon buildup in the fuel injectors. Excessive carbon buildup: It is normal for a car to shake slightly when starting cold, as fuel atomization is poor at this time, leading to uneven air-fuel mixture and non-ideal combustion conditions. This results in uneven operation of the cylinders, causing the engine to shake. The shaking should subside once the engine reaches normal operating temperature. If the car is difficult to start when cold and shakes severely after starting, it is likely due to excessive carbon buildup in the engine. Other possible causes: If the engine continues to shake severely even after reaching normal operating temperature, the reasons may include mechanical faults such as improperly sealing valves or uneven cylinder pressure; a dirty or damaged throttle body in the air supply system; low or fluctuating fuel supply pressure or severely carbon-clogged fuel injectors; severe carbon buildup or electrode erosion in the spark plugs, or a faulty ignition coil causing a misfire; or damaged engine mounts.