What are the causes of car shaking while driving?

[LeilaniRose]

Car shaking while driving can be caused by: 1. Ignition system issues, such as incorrect spark plug gap, excessive carbon buildup on spark plugs, or damaged ignition coils; 2. Excessive carbon deposits on the engine, throttle valve, and fuel injectors are a major cause of engine shaking. Since carbon deposits absorb gasoline, excessive deposits can be drawn into the cylinders for combustion, leading to inconsistent air-fuel mixture concentrations in the cylinders, which is particularly noticeable during cold starts; 3. The engine operates within a specific temperature range. If the coolant temperature is too high, it can cause premature ignition timing, altered air-fuel mixture ratios, thinning of engine oil viscosity, and reduced lubrication performance. Common causes include insufficient coolant, a stuck thermostat, non-functioning fan, or inaccurate temperature control switch settings, all of which can lead to shaking.