What Causes Intermittent Idle Vibration in the Volkswagen Lavida?
1 Answers
Below are the reasons for intermittent idle vibration in the Volkswagen Lavida: 1. Intake manifold leakage: When unauthorized air, fuel vapor, or combustion exhaust enters the intake manifold, it causes the air-fuel mixture to become too rich or too lean, leading to unstable idle. 2. Excessive carbon buildup in the throttle body: Too much carbon buildup in the throttle body and surrounding intake passages alters the cross-sectional area of the air passage, preventing the control unit from precisely regulating idle air intake. This also results in an overly rich or lean mixture, causing unstable idle. 3. Faulty intake system actuators: The engine's intake system has numerous actuators, such as the throttle motor, idle stepper motor, duty cycle solenoid valve, mass airflow sensor, and intake pressure sensor. Damage to any of these components can cause unstable idle. 4. Fuel system issues: Problems like clogged fuel injectors, blocked fuel filters, obstructed fuel pump screens, faulty fuel pressure regulators, or clogged return fuel lines can lead to incorrect fuel injection, resulting in an overly rich or lean mixture and unstable idle. 5. Ignition system faults: Issues such as faulty ignition modules, incorrect spark plug gaps, eroded or damaged spark plug electrodes, or excessive resistance in high-voltage wires can reduce spark energy or cause misfires, leading to erratic idle speeds.
