What Causes Severe Engine Vibration During Car Startup?

1 Answers
VanLayla
07/29/25 4:21pm
The reasons for severe engine vibration during car startup are: 1. Poor combustion of the engine's air-fuel mixture; 2. Substandard fuel quality; 3. Malfunctioning spark plugs, high-voltage wires, or ignition coils; 4. Internal short circuit in the fuel pump, causing abnormal low-pressure fuel supply; 5. Air leakage in the engine intake system; 6. Excessively dirty throttle body or excessive carbon buildup in fuel injectors; 7. Aging engine components. Solutions for severe engine vibration during startup include: 1. Inspecting the working condition of spark plugs, high-voltage wires, and ignition coils; 2. Cleaning engine carbon deposits, throttle body, replacing gaskets and spark plugs; 3. Visiting a 4S shop to check fuel supply pressure and the condition of the intake pressure sensor.
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