jase700

Over the past few weeks, I have noticed that my CS has a very loud (and annoying) resonance inside the cabin when I start my car and drive for the first few minutes. This typically happens after a long period of not running (like in the morning). It has gotten noticably colder in DC over the last few weeks and I'm wondering if that could be part of it. This car was purchased from a dealer in Texas. Not sure if maybe some of the fluid is not ideal for the cold weather?

Thoughts?

mudman2

How long does this last ? Its a new one to me based on your description. Can you elaborate a little more .

jase700

On average several minutes (10-15 minutes). I've tried everything to flush out the cause. moving to lower gears to boost revs, coasting, etc. It seems that all of a sudden it just goes away.

It is not the kind of resonance that would come from a nice exhaust note, this is like shaking the car (but not in the way an unbalanced wheel would).

jason

ltc

Loose/broken weld on a baffle inside the exhaust perhaps?
If it's consistent and reproduceable and under warranty, have the dealer take a listen..

mudman2

Yes wierd, I wonder also about tires, have you something exotic on the car, i.e Snows or Heavily siped. Where are you located ?

hamiam

I have the same problem. Have only noticed it when starting the car after leaving it outside on a cold night. It typically goes away after a few mins. Im located in NYC and the eastern end of Long Island.

mudman2

OK this has me stumped ! I cannot say I have any idea what this may be.

The only droaning noise (wummering) I know of is the Cardan Shaft (main drive) on early 03/04 models this was the cause of many a droan (groan). Shaft replacement cured this.

Filledukke

Beside a possible Cardan Shaft issue it is a fact that the wehicle is heavy. I have the same rumbling and have found that the tires are getting somewhat deformed over the night. The deformation is temporarly and dissapears after a 10-15 min. drive.

Shark

Check the wheel bearings

pdxjim

Try some F-1 type tire heaters! :-)

MadFox

This is a fact - the wheels are soft, thus, they will get out of round overnight -- especially when it is cold. Since winter has arrived, I have a "roar" for the first 10-15 minutes in the morning as the tires warm up from a cold night and sitting 10-12 hours. My garage is detached with no heat.. in the south not a big deal.. worst case it gets in the 30-40's in there unless several days of cold weather. I had no "roar" in the spring through fall and it doesn't seem to happen during the day but then my S doesn't sit in the parking lot all day.. generally go back out from my office for lunch or meetings.

ltc

Cold? In Alabama?
I recall being in Minnesota in February. My car was frozen to the ground and wouldn't move. Had to get a tow truck to 'tap' the rear bumper.
IIRC, the air temperature that morning was -23F.
Cold......you're funny.

MadFox

Brrrrrrrrrrrr... it is really cold tonight.. 38! Supposed to be above 60 by Wed.

phantomias33

I'm sure you've probably seen these....but since we're talking "Brrrrrr":

MadFox

Lake Geneva Switzerland? This is why I live in the south of good old USA. I'm playing golf tomorrow afternoon with temp in the mid 50's low wind and lots of sun!! God I love winter............. HERE!!