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Is It Normal for the Car to Shake When Revving in Neutral?

2 Answers

McAmir

07/24/25 12:50am

Revving the engine in neutral and experiencing shaking is not normal, and the reason is: there is an issue with the engine. The working principle of the throttle is: when the accelerator pedal is pressed, it directly controls the throttle valve, which opens wider, allowing more air to enter the engine. At this point, the ECU commands the fuel injection system to inject more fuel, causing the engine speed to increase and the vehicle to accelerate. Precautions when pressing the accelerator include: 1. Press and release the accelerator pedal gently, ensuring smooth and gradual movements; 2. Releasing the clutch must be closely coordinated with pressing the accelerator, with quick and precise actions; 3. Select an appropriate gear to ensure the engine operates mostly at medium RPM and with a larger throttle opening to save fuel; 4. Before the vehicle comes to a stop or shuts off, the accelerator pedal should be released first, and avoid suddenly revving the engine in neutral.

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DiJason

08/10/25 8:34pm

As a seasoned vehicle repair technician, I often encounter similar issues. It's actually quite normal for the car body to shake slightly when revving the engine in neutral. The reason is that engine vibrations increase with higher RPM, especially noticeable in older cars or high-displacement vehicles—just like how we can feel the engine moving when sitting inside. However, if the shaking is excessive, such as the entire steering wheel vibrating or unusual noises occurring, then something might be wrong. Possible causes include worn-out engine mount rubber, reducing vibration absorption, or ignition system failures leading to uneven cylinder pressure due to misfiring spark plugs. Prolonged operation under these conditions can accelerate part wear, such as mount fractures or engine instability. I recommend that owners first stay calm and inspect the engine mounts for cracks if possible. If equipped, check the ignition coils and spark plugs. If the issue is severe, don’t hesitate—take the car to a repair shop for a comprehensive diagnosis. Safety comes first.

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What happens if you neither cancel nor attend the subject one test?

According to Article 36 of the "Regulations on the Application and Use of Motor Vehicle Driving Licenses" (Ministry of Public Security Order No. 123), if an applicant is unable to attend the test at the scheduled time for any reason, they must apply to cancel the appointment one day in advance. After cancellation, you can reschedule the test at another time, which will not be considered as a failure and no retake fee will be charged. Here is additional information: Subject One: Subject One, also known as the theoretical test or driver's theory test, is part of the motor vehicle driving license examination. According to the "Regulations on the Application and Use of Motor Vehicle Driving Licenses", the test content includes theoretical knowledge of driving, road safety laws and regulations, local regulations, and other related knowledge. The test is conducted on a computer with 100 questions, and a score of 90 or above is required to pass.

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Full score for Subject 3 is 100, what is the passing score?

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