GMC Envoy intermittent tin sound and knocking in engine with check engine light on GMC Envoy

Some GMC Envoy owners report experiencing an intermittent tin sound and knocking in the engine, accompanied by the check engine light coming on. These issues may stem from various factors, including low oil levels, ignition problems, timing issues, rod bearings, or faulty knock sensors. Additionally, an exhaust leak from one of the manifolds can contribute to the knocking sound and increase pressure on the combustion chamber and pistons, potentially resulting in engine damage. The check engine light may also be triggered by a malfunctioning knock sensor that fails to detect engine knocking, allowing the issue to persist. It is crucial for owners experiencing these symptoms to visit a qualified mechanic for diagnosis and repair, as addressing the root cause is essential to prevent further engine damage.