What causes idle vibration in Volkswagen Santana Vista?

[StAshlyn]

Reasons for idle vibration in Volkswagen Santana Vista: Intake manifold or various valve leaks: When the engine's air intake is incorrect, it can cause the air-fuel mixture to be too rich or too lean, leading to abnormal engine combustion. This results in engine idle vibration. When the leak affects the engine's vacuum level, the engine will experience severe vibration, particularly impacting cold idle conditions more significantly. Excessive carbon buildup in throttle body and intake passages: Too much carbon deposits and dirt in the throttle body and surrounding intake passages alter the cross-sectional area of the air passages, preventing the control unit from precisely regulating idle air intake. This causes the air-fuel mixture to be too rich or too lean, leading to abnormal combustion. Idle air control component failure: Faulty idle air control components result in inaccurate idle air regulation. Incorrect air intake measurement: The control unit receives erroneous signals from the air flow sensor and issues incorrect commands, causing inaccurate idle air intake. This leads to abnormal air-fuel mixture concentration and improper engine combustion.