What Causes Car Shaking During Cold Start?

[Ferreira]

Reasons for car shaking during cold start: 1. Severe engine carbon deposits - The gasoline sprayed by the cold start injector is largely absorbed by carbon deposits, resulting in an overly lean air-fuel mixture that makes starting difficult; 2. Ignition system issues - Problems with the ignition system or spark plugs; 3. Unstable oil pressure - Abnormal fuel pump supply pressure or incorrect readings/malfunction of the intake pressure sensor; 4. Aging engine components - Worn engine mounts that can't absorb minor vibrations during operation; 5. Significant tire pressure differences - Uneven force distribution while driving. Solutions for car shaking: 1. Clean the fuel system and check the idle control valve for carbon buildup; 2. Inspect and replace spark plugs; 3. Check oil pressure and replace components if necessary.