Hello all, my 2000 XK8 coupe, with 57k miles on her, occasionally experiences a roaring noise at startup. The sound seems to come from rear of back seat. The noise will stop after a few seconds. It idles a little rough at the same time. All that seems to stop as soon as I rev engine. No trouble shifting into drive. No noise while driving. Seems more likely to happen if I turn key to start quickly as opposed to cycling key slowly and hesitating at system check before cranking engine. Thanks in advance for any ideas and suggestions.

 

the fuel pump is failing

 

I was afraid that was it. I understand there is a primary and secondary pump on this model year. thanks for reply

 

Brad, I thought only the super charged cars have 2 pumps. Let's see what others say.

John

 

Yes, only 1 pump on the 4.0 XK8 - at least its a coupe so he can change the pump through the subwoofer hole and the pumps are cheap being shared with Fords etc.

 

Yes, I was wrong about the two pumps. Being my first Jaguar, I had just finished reading a thread on the forum about changing a fuel pump and failed to notice the thread was about a SC car. I am undeterred though and am searching for replacement parts now. When I decided to enter the world of the vintage luxury car hobby, I committed to doing as much maintenance myself as possible. I will post results when complete. Thanks all for the help and advice. Brad

 

Just to throw a trivial possibility out there, any chance you're hearing the antenna mast extending?

It might be a little overstated to call it "roaring," but every once in a while I notice the sound as I'm starting up and have to remember what it is.

 

Thank you for the suggestion Volkris. I rarely play the radio because the antenna hits my garage door so I have to be careful about that and have gotten in the habit of turning the radio off before entering and on after exiting. Antenna is a different sound as well. Good call though. Thanks