What Causes a Car to Shake After Starting?

1 Answers
JasperAnn
07/30/25 6:10am
The reasons for a car shaking after starting are: 1. Severe carbon deposits in the engine cylinders, which can cause spark plug blockage and valve blockage; 2. Unstable oil pressure, which easily leads to unstable concentration of the air-fuel mixture; 3. Aging engine mounts; 4. Issues with the ignition coil or the spark plugs failing to fire for some reason. If the car shakes when first started but stops shaking after the engine warms up, this could be due to the lubrication system not fully lubricating during a cold start, causing rough operation, or the engine not yet reaching the appropriate operating temperature, resulting in incomplete fuel combustion and knocking. If the car shakes upon starting, it is recommended that the owner promptly take it to a 4S shop for inspection and repair. Do not take it lightly; it is important to identify the source of the shaking promptly, as it could otherwise lead to more significant issues.
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