Toyota RAV4 motor makes sound on start-up, possibly related to timing chain despite visual inspection on Toyota RAV4

Some Toyota RAV4 owners report experiencing a rattling noise upon start-up, particularly when the engine is cold, which may indicate a timing chain issue. This cold start rattle is a known problem in certain earlier versions of the 2017 model, with the sound typically originating from the front of the engine and being most noticeable at low RPMs. Owners have identified two primary factors contributing to this engine rattle: the timing chain and the tensioner. If a timing chain problem is suspected, it is crucial to address the issue promptly to prevent further engine damage. In some instances, a loose timing chain can result in a clicking sound during acceleration, especially when driving uphill or applying more pressure on the gas. It is advisable for those experiencing this issue to consult a trusted mechanic familiar with Toyota vehicles, as the noise may dissipate after a few minutes of driving, but resolving the underlying cause is essential for the vehicle's long-term health.