'99 9-5 auto roaring noise on acceleration

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leigh - 04 Jan 2007 00:27 GMT

Hi everyone, my automatic 1999 9-5 2.3 lpt makes a roaring sound b/w 30
and 40 mph. it didn't make that sound before. the noise doesn't seem
to be coming from any side of the car in particular, and the muffler
was replaced a few months ago. it really sounds more like a "wooooo"
than a whine or a grind, and it's pretty loud - my passengers tend to
(annoyingly) point it out. any ideas on what this sound could be? i
can live with it but i don't want it to turn into something much worse
if left unattended. thanks in advance for any help you guys can offer.

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Eeyore - 04 Jan 2007 01:37 GMT

> Hi everyone, my automatic 1999 9-5 2.3 lpt makes a roaring sound b/w 30
> and 40 mph. it didn't make that sound before. the noise doesn't seem
[quoted text clipped - 4 lines]
> can live with it but i don't want it to turn into something much worse
> if left unattended. thanks in advance for any help you guys can offer.

A light whistly noise ? Almost musical ?

Might be the turbo.

Graham

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leigh - 04 Jan 2007 02:53 GMT

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 bearings checked to no avail.

> > Hi everyone, my automatic 1999 9-5 2.3 lpt makes a roaring sound b/w 30
> > and 40 mph. it didn't make that sound before. the noise doesn't seem
[quoted text clipped - 10 lines]
>
> Graham

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Richard - 04 Jan 2007 17:35 GMT

> actually, deeper, like a gutteral mooing or a zombie's groan (sigh).
> these are the best ways to describe it.
[quoted text clipped - 5 lines]
>> > to be coming from any side of the car in particular, and the muffler
>> > was replaced a few months ago. it really sounds more like a "wooooo"

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.

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leigh - 04 Jan 2007 19:35 GMT

thanks for the suggestions, i'll definitely take a look.

> > actually, deeper, like a gutteral mooing or a zombie's groan (sigh).
> > these are the best ways to describe it.
[quoted text clipped - 19 lines]
>
> Richard.

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Bill Jackson - 11 Jan 2007 02:08 GMT

> actually, deeper, like a gutteral mooing or a zombie's groan (sigh).
> these are the best ways to describe it.
[quoted text clipped - 15 lines]
>>
>> Graham

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

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Peter Wilkins - 06 Jan 2007 07:52 GMT

>Hi everyone, my automatic 1999 9-5 2.3 lpt makes a roaring sound b/w 30
>and 40 mph. it didn't make that sound before. the noise doesn't seem
[quoted text clipped - 4 lines]
>can live with it but i don't want it to turn into something much worse
>if left unattended. thanks in advance for any help you guys can offer.

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.

Signature

Regards,
Peter Wilkins

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