What Causes Car Vibration?

[MacKiara]

Car vibration during startup can be caused by severe carbon buildup, ignition system malfunctions, or fuel pressure issues. The details are as follows: Severe Engine Carbon Buildup: Engine carbon buildup is the primary cause of car vibration. When there is excessive carbon buildup inside the engine, the gasoline sprayed by the fuel injector during a cold start is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture and making the car prone to vibration during cold starts. Ignition System Malfunction: Excessive carbon buildup on the spark plugs or overly large ignition gaps can lead to ignition failure. Fuel Pressure Issues: Abnormal fuel pump pressure or incorrect readings from the intake pressure sensor can cause the fuel pump to operate poorly, leading to car vibration.