What Causes Car Body Vibration?

[SanFrank]

There are two scenarios for car body vibration: 1. Idle vibration when parked: This is usually caused by low idle speed or engine misfiring. For misfiring, check the spark plugs and high-voltage wires. Additionally, it could be due to carbon buildup in the engine. During cold starts, carbon deposits absorb some gasoline, resulting in an overly lean combustible mixture, making starting difficult or causing engine vibration. Clean the fuel injectors and throttle body. If the throttle body is excessively dirty, also clean and replace the air filter. 2. Vibration while driving: This is related to the chassis, caused by excessive play in the tie rods or control arms. A four-wheel alignment can resolve this issue.