Is It Normal for the Audi A4L to Shake During Auto Start-Stop?
3 Answers
Audi A4L shaking during auto start-stop is not normal; the shaking is typically caused by poor tire balance or deformed wheel rims. Below are the specific reasons: Poor Tire Balance: If you notice slight shaking or deviation of the car body while driving, it is usually due to tire-related issues. The primary cause may be poor tire balance, requiring the owner to perform a four-wheel alignment and dynamic balancing as soon as possible. If the vehicle does not pull to one side, dynamic balancing of the tires may suffice. Deformed Wheel Rims: Another more severe condition could be due to deformed wheel rims, which necessitates a professional inspection at a repair shop. This issue generally occurs in older vehicles with prolonged usage.
I've been using this A4L for over two years now, and it does give a slight shake when the auto start-stop kicks in, just like a phone vibration. It's most noticeable during traffic jams. Actually, this is normal when the engine restarts, similar to the vibration when lighting a lighter. But if it shakes violently like a sieve, even making the steering wheel wobble, then something's wrong. I remember the mechanic said during the last maintenance that overly thick engine oil or excessive carbon buildup can worsen the shaking. New cars shake less, but after driving 50,000 to 60,000 kilometers, the vibration becomes more noticeable. I've gotten used to this slight tremor at red lights—it feels similar to when an elevator starts moving. If it really bothers you, just turn off the auto start-stop button and that's it.
I've driven three cars with auto start-stop, and the vibration from this Audi is about average. Every time the engine restarts, you can feel a slight tremor through the seat, but it doesn't affect driving. This is most related to engine mount aging and spark plug condition. The most exaggerated vibration I experienced was after using substandard engine oil. On regular asphalt roads, it might be negligible, but the vibration doubles when restarting on concrete speed bumps. Don't confuse it with cold starts—shaking during a cold start is a different issue. If it's accompanied by rattling noises or erratic tachometer jumps, head to the dealership to check the electrical system. Actually, developing the habit of having the mechanic inspect the engine mounts during maintenance is quite useful—the damping effect diminishes as the rubber ages.
