One problem related to engine noise has been reported for the 2004 Jaguar XJ8. The most recently reported issues are listed below.
An incident with the vehicle occurred sometime around christmas 2011. The motor surged while I was fully stopped at a street light. The motor was running, the car was in drive gear, and my foot was on the brake. I was able to quickly bring the car under control. A second event occurred in 2012, may 15th, at 11:00 p. M. While I was fully stopped at a drive through window. Again the motor surged, this time with a loud screeching sound. I applied maximum brake pressure but the car continued to surge forward, approximately six feet. I sustained full force pressure to the brake, threw the car into neutral gear, and turned off the ignition in order to stop the car. I immediately drove it home where it has remained parked---except for two excursions to the sacramento Jaguar dealership service department.