What Causes Severe Engine Vibration During Startup

[SanMakayla]

Here are the reasons for severe engine vibration during startup: 1. Damaged spark plugs, where the wear of the spark plug electrode gap leads to insufficient spark ignition, resulting in incomplete combustion of the air-fuel mixture; 2. Poor quality gasoline, which causes poor atomization effect of the fuel injector, leading to incomplete combustion of the mixture in the cylinder; 3. Dirty throttle body and excessive carbon buildup on the fuel injector; 4. Abnormal fuel pump supply pressure or incorrect and malfunctioning intake pressure sensor readings. Additional information: The function of the engine is to convert thermal energy into mechanical energy by expanding gas after combustion in a sealed cylinder, pushing the piston to do work, thereby providing power to the vehicle.