What Causes the Vibration in BYD DM-i?
2 Answers
BYD DM-i vibration can be caused by insufficient power, idle speed issues, excessive speed, or engine aging. The details are as follows: Insufficient Power: Vibration during startup is due to insufficient fuel combustion, leading to inadequate power. This can be resolved by cleaning engine carbon deposits or using higher-grade fuel to improve combustion and clean the engine intake system. Idle Speed Issues: Idle vibration is caused by severe engine carbon buildup, ignition system problems, or unstable oil pressure. Solutions include cleaning the fuel system, checking the idle speed motor for carbon buildup, inspecting spark plugs for excessive carbon deposits, and replacing spark plugs, engine mounts, or other aging components. High-Speed Vibration: High-speed vibration may result from incorrect tire pressure, abnormal tire wear, rim deformation, shock absorber failure, or tire imbalance. Prompt inspection of the relevant parts is necessary. Engine Aging: Engine mount aging can cause vibration. The engine mount acts as the engine's shock absorption system, absorbing minor vibrations during operation. If the engine mount fails, these vibrations can transfer to the steering wheel and cabin, causing noticeable shaking. In this case, timely replacement of the engine mount is required.
In the BYD DM-i car owners' group, I've discussed numerous vibration issues, mostly occurring during engine startup or hybrid mode transitions. Cold starts with low engine temperatures may lead to incomplete fuel combustion; sudden load changes when switching from pure EV to hybrid mode can easily cause shaking. Additionally, aged spark plugs or carbon buildup can result in unstable ignition, especially noticeable during prolonged low-speed urban driving. Clogged fuel pumps or filters may restrict fuel supply, exacerbating vibrations. I recommend first checking simple components: inspect spark plug conditions and engine mount tightness; use an OBD scanner to read fault codes. Routine maintenance like using quality fuel and regular oil/filter changes can effectively prevent vibrations. DIY spark plug replacement isn't difficult, but remember to prepare proper tools and compatible parts—don't force anything to avoid damage.
