What are the reasons for car body shaking at 80 mph?
1 Answers
The reasons for car body shaking at 80 mph are as follows: 1. Ignition system issues: Check the working condition of spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or faulty spark plug firing can cause such symptoms. 2. Unstable oil pressure: If you've already cleaned engine carbon deposits, washed the throttle body, replaced oil pads and spark plugs, but still notice body shaking at idle, it's recommended to visit a 4S shop to check the fuel supply pressure and intake pressure sensors. Abnormal fuel pump pressure or faulty readings from the intake pressure sensor can cause body shaking. 3. Car shaking may be related to aging engine mounts: Engine mounts serve as the vibration damping system for the engine, absorbing minor vibrations during operation. If the engine mounts are faulty, these vibrations can transfer to the steering wheel and cabin, causing shaking at idle. 4. Severe engine carbon buildup: The most common cause of car shaking is excessive dirt in the throttle body or carbon buildup in the fuel injectors. When there's too much carbon inside the engine, the gasoline sprayed by the cold-start injector is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and difficulty starting. Only when the carbon deposits are saturated with gasoline does the car start easily.
