Why Does the Car Body Shake When Shifting from D to R?

[DiIsaac]

Engine idle speed issue. Solutions: 1. When starting a cold engine: Allow the car to idle for one and a half minutes to give it a warm-up period. At the initial start, the internal temperature of the engine does not reach the normal operating temperature—the normal temperature is indicated when the water temperature gauge reaches 90 degrees. The car may shake, the engine noise may be loud, and the tachometer may be slightly higher—normal values range from 600 to 900 RPM. Starting under such conditions can easily lead to carbon buildup in the engine because combustion is incomplete at low temperatures. 2. Avoid lugging the engine while driving: When the engine starts to shake, downshift promptly. Lugging the engine can cause excessive pressure, insufficient power, incomplete combustion of gasoline, and carbon buildup in the injectors, affecting the engine's lifespan. 3. Protect the undercarriage: The undercarriage is the part of the car closest to the ground and is highly susceptible to damage from road objects. Therefore, regularly inspect the undercarriage to prevent excessive damage from foreign objects.