Car Vibrating at High Speeds: Common Causes and How to Fix It Vibration At Higher Speeds Found & Fixed Possible Causes Listed Car Shakes When Accelerating. Most Common Reasons and How To Diagnose It Car Shakes When Accelerating but Not When Coasting: 9 Reasons While lots of things from brakes to tires to steering can cause a car to vibrate, sometimes vibrations can actually come from the engine compartment. This happens when the engine isn't getting