How to Determine if Idle Vibration in a New Car is Normal?
2 Answers
You can assess the severity of the vibration. Generally, if there's a misfire, the vibration will be very noticeable. For example, placing a full cup of water on the car can easily cause the water to spill out due to the shaking. Additionally, observe whether the vibration is intermittent and rhythmic. If the vibration is irregular, it is definitely a malfunction, and you should seek repairs immediately.
From the perspective of a seasoned driver with over 20 years of experience, here's how to determine if idle vibration in a new car is normal. It's quite normal for a new car to have slight vibrations when first started, as the engine is adjusting to its operating state. The key factors are the amplitude and duration. For example, place a hand on the steering wheel—if the vibration feels like the slight buzz of a mobile phone rather than significant shaking, it's generally not a major issue. Once the engine reaches normal operating temperature, the tachometer should stabilize around 700 RPM, with fluctuations not exceeding 50 RPM. However, if the shaking becomes progressively worse, or if the entire seat vibrates noticeably when the car is stationary, accompanied by abnormal "clunking" noises, then it's time to pay attention. New cars may experience unstable idling due to fuel line blockages or unbroken-in spark plugs, so it's advisable to visit a 4S shop early for professional diagnostic equipment. Remember not to panic excessively—most issues can be alleviated after the first maintenance service, but for safety's sake, don't delay.
