'99 9-5 auto roaring noise on acceleration

A light whistly noise ? Almost musical ?

Might be the turbo.

Graham

actually, deeper, like a gutteral mooing or a zombie's groan (sigh). these are the best ways to describe it.

forgot to add that i had the wheel bear> leigh wrote:

"leigh" schreef in bericht news: snipped-for-privacy@6g2000cwy.googlegroups.com...

Did this sounds start around the same time the muffler was changed? Then that would be the first thing to consider, and check. Maybe the muffler touches a body part somewhere and resonates at a certain speed?

I remember one of my old cars... they replaced the exhaust pipe, and all was well, UNTIL you started driving and accelerating. Then the movement of the engine made the pipe just touch the chassis, and the sound was what you describe. Its not locatable, because the whole chassis is vibrating making the sound come from "everywhere"

Good luck!

Richard.

berichtnews: snipped-for-privacy@6g2000cwy.googlegroups.com...

this sounds start around the same time the muffler was changed?

I had a similar problem, took ages to pinpoint it. It was two of the tyres that had developed ridges and out-of-round condition. Replaced the tyres, lost the noise.

--=20 Regards, Peter Wilkins

I had something similar on my 99 9-5, couldn't quite describe it but it was (1) about that speed and (2) only under acceleration. Almost sounded like tire noise on a really aggressive tread.

About 6 months later I started to hear the tell-tale signs of a wheel bearing going, got that replaced and the grinding/sound went away.

Bet that's it, mine was the left front