What Causes Engine Vibration in Lexus UX?

[Camilla]

Lexus UX engine vibration causes: 1. Intake system malfunction: Excessive dirt accumulation in the throttle body or intake manifold, or a clogged air filter element reduces the cross-sectional area of the idle channel. This results in insufficient air entering the cylinders, causing enriched mixture and incomplete combustion, leading to engine vibration. 2. Fuel system malfunction: Fuel supply pressure abnormalities. Multiple factors can cause this: clogged fuel filter; damaged fuel pump or blocked pump screen; insufficient fuel pump pressure; weakened fuel pump relief valve spring; faulty fuel pressure regulator, etc. Abnormal fuel pressure causes excessively rich or lean mixture, reducing engine power output and causing vibration. 3. Ignition system malfunction: Spark plugs introduce high voltage into combustion chambers and generate sparks between electrodes to ignite the air-fuel mixture. Issues like incorrect electrode gap, carbon deposits/erosion on electrodes, or cracked insulators can cause misfiring or weak sparks, resulting in poor combustion and uneven engine power distribution. 4. Electronic control system malfunction: If ECU receives inaccurate sensor data, it will cause incorrect ignition timing or fuel injection, preventing normal engine operation. The control unit (core component managing injection/ignition) commonly fails due to internal circuit damage or poor connections.