Possible Causes of Magotan Shaking at 120 km/h on Highway
2 Answers
Magotan shaking at 120 km/h on the highway is mainly due to severe carbon deposits in the engine. Here is an extended introduction about the causes of body shaking: 1. Severe carbon deposits in the engine: Dirty throttle or excessive carbon buildup in 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 mixture during cold starts and making it difficult to start. In this situation, the car will only start easily once the carbon deposits have absorbed enough gasoline. After starting, the gasoline adsorbed on the carbon deposits will be sucked into the combustion chamber by the engine's vacuum, making the mixture too rich. This fluctuation between lean and rich mixtures causes the engine to idle roughly after a cold start. The lower the temperature, the more fuel is needed for a cold start, and the presence of carbon deposits will further affect the smoothness of the cold start. Solution: Clean the fuel system and check if the idle speed control valve has carbon deposits. Clean it if necessary. 2. Ignition system issues: Check the condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or weak sparking from the spark plugs can also lead to such issues. Solution: Check if the spark plugs have excessive carbon deposits and replace them if necessary. 3. Unstable fuel pressure: If you have already cleaned the engine carbon deposits, throttle body, replaced gaskets, and spark plugs but still experience body shaking at idle, it is recommended to visit a 4S shop to check the fuel supply pressure and intake pressure. Abnormal fuel pump pressure or faulty readings from the intake pressure sensor can also cause body shaking. Solution: Check the fuel pressure and replace components if necessary. 4. Aging engine components: Car shaking can also be related to aging engine mounts (also known as engine mounts). Engine mounts act as the engine's shock absorption system, absorbing minor vibrations during operation. If the engine mounts are faulty, these vibrations will be transmitted to the steering wheel and the cabin, causing shaking at idle. Solution: Replace the components.
When I drive my Magotan on the highway, once the speed reaches 120 km/h, I feel the body shakes violently, the steering wheel wobbles, and the whole car becomes unstable. I remember after that trip, the inspection revealed that tire imbalance was the main issue, possibly caused by not performing dynamic balance after tire repair or wheel rim deformation. Uneven tire wear or insufficient tire pressure can also worsen the shaking. If the suspension system components like shock absorbers are aged or failed, the body is more prone to bouncing at high speeds. The impact is significant—it reduces handling performance and increases the risk of rollover. I suggest getting a four-wheel alignment and tire dynamic balance check first. These simple services can be done at a repair shop for just a couple hundred yuan—don’t wait until the problem becomes severe. Also, avoid hitting curbs aggressively while driving and maintain regular tire upkeep to prevent such issues.
