I have an 04 xj8 with 77k on the clock. I recently purchased the car and now am starting to hear a strange engine noise when I'm at idle sitting at lights. You can hear the engine rpms oscillate up and down while sitting at idle but the tach never shows any movement. You can feel it in the seats and in the steering wheel. Does this sound like anything that any of you have come across?

 

Nothing guys?

 

Possible exhaust leak between engine and 1st silencer . A WAG .

 

Does this sound right to any of you? If so, is it something I can fix myself?

 

It would be very difficult for anyone to even attempt to diagnose a sound without hearing it.

 

let's make one thing clear, this is Jaguar there's no such thing "I can fix my self?" LOL you gotta spend $$$$ on your cat =) and it may be a bad fuel pump or injectors or coils you never know it could be almost anything take it to a Jag dealer

 

Look for an error code first, take it to a dealer as a last resort.