Engine like noise from under the back seats area

[TheCanadian]

I have 8000KM on my edge and recently noticed an engine like noise coming from under the back seats area.

It can be heard only from inside and only when driving.

It sounds like a motorcycle is following the car very closely.

Any idea on what could this be? Could it be the wheels as this happens only when driving?

Should I take it in or wait for the 10,000KM check-up?

Thanks

[vino125]

Maybe fuel pump noise?

[scalewoodman]

Is it intermittent?

If continuous does it increase/decrease with the engine RPM?

or

Increase/decrease with the speed of the wheels traveling down the road?

Does the volume increase/decrease with acceleration?

 

Always check obvious things first: I betcha tail pipe noise-- somehow the tail pipe is making contact with the frame-- in unibody cars the vibration, which would likely be intermittent due to the shifting of the engine on its soft mounts (designed to isolate vibration from the rest of the car) is hard to pinpoint as the structure transmits a specific sound throughout. If you backed into a curb or bumped underneath it could have caused it to be out of place.

 

The fuel pump cycles on/off one speed... should be easy to isolate/low probability however.

 

A lot of the other things are more serious: rear end (AWD?), driveshaft... If you find the sound is increasing in severity don't let it go... take the car in today rather than risk more expensive damage.

[TheCanadian]

Thanks for the feed back guys.

Yes, the sound increases with the speed of the wheels but not with RPM or acceleration.

It's been constant since it's started but I'll take it in.

Thanks again