INFINITI QX80 engine squeaking noise at startup and low speeds, potential belt or exhaust issue on INFINITI QX80

Some INFINITI QX80 owners report experiencing a squeaking noise in the engine at startup and low speeds, which may be attributed to several potential causes. These owners have noted that a high-pitched squealing sound can result from an overly tight, loose, or worn serpentine belt, which powers many of the vehicle's major systems. Additionally, a worn or faulty alternator pulley may contribute to the noise, sometimes accompanied by a burning smell or a warning light indicating a charging system issue. To resolve the squealing, some owners find it necessary to replace the pulley or alternator. Another reported cause is the timing chain rubbing against the timing cover, which can occur as the chain stretches over time. Furthermore, a damaged timing belt has also been identified as a common source of engine squealing noises, as it can become stretched or cracked. It is recommended that affected owners seek a professional mechanic's inspection to accurately diagnose the issue and determine the necessary repairs or replacements.