What Causes Severe Vibration During Cold Start of Magotan?
2 Answers
The reasons for severe vibration during cold start of Magotan are as follows: 1. Severe engine carbon deposits: The most common cause of car vibration is excessive dirt on the throttle or carbon buildup on the fuel injectors. When there is too much carbon deposit inside the engine, the gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold start, making it difficult to start. In this situation, the car will only start easily after the carbon deposits have absorbed enough gasoline. After starting, the gasoline adsorbed on the carbon deposits will be drawn into the cylinder by the engine's vacuum suction for combustion, making the air-fuel mixture too rich. The combustible mixture in the engine alternates between being too lean and too rich, causing idle vibration after cold start. The lower the temperature, the more fuel is needed for cold start, and the presence of carbon deposits will significantly affect the smoothness of the cold start. 2. Ignition system issues: Check the working condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or inadequate sparking of the spark plugs can also cause severe vibration during cold start of the Magotan. 3. Unstable fuel pressure: If you have already cleaned the engine carbon deposits, cleaned the throttle, replaced the gaskets and spark plugs, but still notice body vibration at idle, it is recommended to visit a 4S shop to check the fuel supply pressure and the intake pressure sensor. Abnormal fuel pump pressure or incorrect readings and poor performance of the intake pressure sensor can all cause body vibration. 4. Aging engine components: Car vibration can also be related to the aging of engine mounts (also known as engine cushions). Engine mounts are actually the shock absorption system of the engine, responsible for absorbing minor vibrations during engine operation. If the engine mounts are faulty, these vibrations will be transmitted to the steering wheel and the interior of the car, causing vibration at idle.
I drove a Magotan for five years, and some time ago, it shook violently during cold starts, like the whole car was dancing—really scary. Later, during a check-up, it was found that the engine had severe carbon buildup, especially around the intake valves, where sludge accumulation caused an imbalance in the air-fuel mixture, leading to rough shaking during startup. Another possible cause could be old spark plugs not being replaced in time, resulting in poor ignition. I recommend using good fuel additives regularly for cleaning and sticking to scheduled maintenance to avoid bigger issues. If a sensor fails, like the coolant temperature sensor falsely reporting high temperatures, the ECU may miscalculate the fuel mixture, causing shaking. Safety first—if you notice shaking, get it checked at a repair shop immediately. Otherwise, sudden engine failure on the highway could be dangerous. The problem is more noticeable in cold weather, so keeping the engine healthy is key.
