What is the reason for the insignificant shaking of the test car?

[LeElijah]

The reason for the insignificant shaking of the test car may be insufficient engine power. Below is relevant information about the test car: 1. Operation standards: The driver only needs to control the accelerator pedal, brake pedal, and steering wheel to better focus on the driving view and road conditions. Car manufacturers have meticulously designed the D gear operation, so as long as you are not driving on extreme roads or sections, using D gear for forward movement is sufficient. 2. Analysis of car body shaking: If you have already cleaned the engine carbon deposits, washed the throttle valve, replaced the oil pads and spark plugs, etc., and still find the car body shaking at idle, then you need to check whether the fuel supply pressure and intake pressure sensor are normal. If the fuel pump supply pressure is abnormal or the intake pressure sensor value is incorrect and not working properly, it will cause the car body to shake.

[OTeagan]

I've been in this industry for over a decade, and the exam vehicles don't shake noticeably, mainly because they're in excellent condition and well-maintained. Those examiner vehicles are regularly serviced, with optimized engine systems ensuring smooth RPM; suspensions and tires are updated promptly to guarantee comfort; plus, drivers operate them properly, maintaining even speed control during tests without sudden acceleration or braking, naturally reducing bumps. I've seen many private cars develop shaking issues due to long neglect, like worn brake discs or clogged air filters. To avoid it, I recommend regular full inspections like exam vehicles—don't skimp to save money or effort. After all, smooth driving isn’t just for exams but crucial for daily safety. Ignoring this could lead to tire blowouts or engine damage.

[DeHarley]

As someone who frequently deals with exam vehicles, I've found that minimal vibration is often a sign of a car in perfect condition. The testing units strictly adhere to maintenance schedules, replacing parts like spark plugs and shock absorbers to ensure efficient engine and transmission operation. They also carefully select test routes, predominantly using smooth urban roads to avoid the impact of rough conditions. Additionally, the delicate operation by trainees, who avoid sudden acceleration, collectively contributes to significant noise and vibration reduction. If regular cars received such meticulous maintenance, people wouldn't complain about vibrations. I usually recommend checking tire pressure and oil levels regularly to address potential issues proactively.

[HavenRose]

With ample personal driving experience, I find that exam vehicles shake less mainly because they are maintained like new cars. These vehicles undergo servicing after every exam, with precise engine and wheel alignment, making them less prone to shaking. The exam venues meet standards, and the reasonable operating speed helps the cars run smoothly. Driving older cars in daily life often leads to tremors due to aging parts, reminding me to change engine oil and brake pads more frequently.