What Causes Low-Speed Vehicle Body Shaking?
1 Answers
Low-speed vehicle body shaking is primarily caused by the accumulation of carbon deposits in areas such as the throttle body, intake tract, and valves. When the engine is cold, these deposits absorb some gasoline. As the engine warms up, the gasoline evaporates, leading to an overly rich air-fuel mixture during idle, which results in low-speed shaking. Throttle maintenance methods: 1. Release gases: Engine oil volatilizes under heat during use. The longer the usage period and the higher the temperature, the stronger the volatilization. Additionally, some compressed gas from the cylinder will inevitably squeeze into the crankcase through the piston ring gaps. Therefore, there must be a passage to release these gases; otherwise, the oil pan will develop positive pressure. 2. Negative pressure extraction: The reason the crankcase ventilation tube connects to the throttle body is partly due to environmental requirements and partly to utilize the intake's negative pressure to extract gases from the crankcase. When oil vapor reaches the intake pipe, it cools down, causing the oil to condense on the intake tract and throttle body. The carbon deposits mixed in the vapor will also deposit in these areas. Since the throttle opening has the highest airflow rate, a small space, and lower gas temperature, this part is most prone to condensation.
