Car Vibrates When Idle: Major Causes and More dubizzle Why Does Your Engine Vibrate at Idle? Noticing your engine shaking or vibrating while idling? This could mean something isn't right under the hood. Here's what might be causing it and how Car Shakes at Idle? Common Causes & How to Fix it The reasons behind idling car vibrations explained WHY YOUR CAR SHAKES WHEN IDLING If your car feels smooth while driving but starts vibrating or shaking at a stoplight, something isn't right. At idle, the engine runs at its