What Causes Car Body Shaking During Startup?

[CharlieDella]

Reasons for car body shaking during startup: 1. Unstable oil pressure - Abnormal fuel pump supply pressure or incorrect readings from the intake pressure sensor can cause body shaking. Solution: Check oil pressure and replace components if necessary; 2. Aging engine components - Problems with engine mounts can transmit vibrations to the steering wheel and cabin, causing shaking at idle. Solution: Replace components; 3. Common causes include dirty throttle bodies or excessive carbon deposits in fuel injectors. When there's too much carbon buildup in the engine, gasoline sprayed by cold-start injectors gets largely absorbed by 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.