One problem related to engine funny noise has been reported for the 2013 Infiniti QX56. The most recently reported issues are listed below.
The vehicle was completely dead and would not start when battery was jumped. Battery was replaced once it was discovered that the original battery was completely dead. Once the vehicle started , the engine light was visible on the dash. The vehicle was making a very loud humming sound coming from under the hood. The sound got louder and intensified as the rpms increased.