What Causes Car Body Shaking at 40-50 MPH?

[LeSteven]

Car body shaking at 40-50 MPH can be caused by the following reasons: 1. Carbon buildup: Issues caused by carbon deposits in the engine or throttle body. The most common cause of car shaking is a dirty throttle body or excessive carbon buildup in the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold start injector can be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. 2. Tire problems: Caused by tire deformation or damaged wheel bearings. Car tires are one of the most important components of a vehicle, as they directly contact the road surface and work together with the suspension system to absorb shocks during driving. 3. Speed mismatch: Caused by a mismatch between the gear and speed.