What are the precursors of timing chain failure?

[VanBrynlee]

When the timing chain becomes loose, the car may exhibit symptoms such as shaking, poor acceleration, lack of power when accelerating, and difficulty starting. Timing chain loosening is a relatively common issue. A loose chain indicates that the chain has been stretched, which can easily lead to skipping teeth, resulting in abnormal noise from the engine. Although the engine's timing chain has strong durability, it is not maintenance-free for life. Over time, with engine use, stress, and wear, the chain can stretch, creating gaps and causing the timing chain to loosen. Once signs of timing chain failure appear, prompt inspection and repair are necessary. You can use a spring scale to measure the elongation at three or more points. If the elongation exceeds the permissible length, the chain should be replaced immediately. The professional approach is to have it inspected at a repair facility by reading the crankshaft sensor and camshaft sensor. If there is an alarm indicating operational delay, there may be a risk of chain stretching, and the chain should be replaced promptly.