What Causes the Car Body to Shake After Starting?

[DeCali]

Here are the reasons why the car body shakes after starting: 1. Unstable oil pressure—abnormal fuel pump supply pressure or incorrect readings from the intake pressure sensor can cause the car body to shake. Solution: Check the oil pressure and replace components if necessary; 2. Aging engine components—if the engine mounts are faulty, vibrations can be transmitted to the steering wheel and cabin, causing shaking at idle. Solution: Replace the components; 3. A common cause 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 difficulty starting. Solution: Clean the fuel system and remove carbon deposits from the idle control valve.