What makes my Lincoln Navigator engine noise?

Engine noise in your Lincoln Navigator can stem from several sources, including worn or damaged components like the timing belt, serpentine belt, or valve lifters. Other potential causes could be low oil levels or quality, which can lead to increased friction and noise. Additionally, exhaust leaks or issues with the engine mounts may also contribute to unusual sounds. It's best to have a professional mechanic diagnose the issue for a precise evaluation.