Why does the Audi A8 make abnormal noises during cold start?
2 Answers
Audi A8 abnormal noises during cold start are due to the small clearance between the gasoline engine piston and cylinder wall. Reasons for abnormal noises during cold start: Abnormal noises during cold start occur because the components are cold and hard, with insufficient lubrication, leading to the noises. Additionally, when the drive wheels slip, avoid sudden acceleration as it can cause the planetary gears to seize on their shafts. Effects of cold start: Cold start refers to starting the engine after it has been turned off for a while, when the engine has cooled down and its temperature is much lower than the normal operating temperature, and the engine oil has mostly drained back. Over 80% of engine wear occurs during the cold start phase.
I've been driving an Audi A8 for several years, and every winter during cold starts, I always hear a squeaking or clicking noise. At first, I was quite worried, thinking it might be a major engine issue. With more experience, I realized this is quite common. Most of the time, it's an issue with the belt system—like a loose or worn auxiliary belt that makes noise due to friction when the engine is cold. It could also be a failing hydraulic tensioner or delayed oil lubrication. The Audi A8 is a high-performance car, but its components contract noticeably during cold starts, causing noise if not preheated. The solution is simple: wait a few extra minutes before starting to let the engine warm up; check if the belt is severely worn and replace it at a professional shop if necessary. Don’t worry—it’s not a big problem, but ignoring it can accelerate wear. It’s best to address it early to avoid costly repairs later. Replacing the belt is usually inexpensive, and you can even inspect it yourself for cracks.
