What Causes Tire Vibration at Idle?
1 Answers
Minor tire vibration at idle is normal. Below is additional information: Introduction to Idle Vibration: Idle vibration occurs when the engine is running but the oil supply doesn't keep up promptly, resulting in poor mechanical operating conditions for the engine or issues like poor fuel injector atomization and improper idle adjustment, which cause engine vibration. If noticeable body vibration occurs when starting the vehicle or when the vehicle is stationary with the engine running, it is usually due to severe engine carbon buildup or a dirty throttle body. When there's excessive carbon buildup inside the engine, the gasoline sprayed by the cold-start injector is largely absorbed by the carbon deposits, leading to an overly lean air-fuel mixture during cold starts and making it difficult to start. In this situation, the engine will only start easily once the carbon deposits are saturated with gasoline. After starting, the gasoline adsorbed on the carbon deposits is drawn into the combustion chamber by the engine's vacuum, enriching the air-fuel mixture again. This fluctuation between lean and rich mixtures causes idle vibration after a cold start. Solutions for Idle Vibration: If the car body vibrates when stationary in N gear, with noticeable seat and steering wheel vibrations, and the vibration is obvious while driving, but the engine power is normal and no engine fault indicator is lit on the dashboard, this is mostly caused by aging, cracking, or oil leakage in the engine mounts. You can check the engine mounts for faults and replace them if necessary.
