What Causes the Bumpy Sensation When Driving at Low Speed?

[Mckenzie]

Here are the reasons why a car may experience jolts and bumps when driving at low speed: 1. Unstable oil pressure If the fuel pump's supply pressure is abnormal or the intake pressure sensor's readings are incorrect or malfunctioning, it can cause the car body to shake. 2. Dirty throttle valve, excessive carbon deposits in the fuel injector or intake manifold The gasoline sprayed by the cold start injector can be largely absorbed by carbon deposits, resulting in an overly lean mixture during cold starts, making it difficult to start and causing the car body to shake. 3. Ignition system issues Poor spark plug performance can also lead to such fault phenomena. 4. Aging engine mounts or engine supports. 5. Deformed wheel rims or unbalanced wheel rim weights. Below are the provided solutions: 1. Visit a 4S shop to check the fuel supply pressure and intake pressure sensor for normal operation, and proceed with replacement or repair if necessary. 2. Clean engine carbon deposits, throttle valve, replace oil pads and spark plugs. 3. Perform four-wheel alignment and dynamic balancing to determine tire balance conditions and replace tires if needed.