C4 Tip 2001 Buzz on cold start

[barlowdo]

I have noticed that in the morning after the car has sat all night that on start up I hear a buzz. It sort of sounds tinny like a exhaust pipe and comes from drivers side. It goes away with in seconds.

After the car warms up it either on start up is not there or is much less noticeable.

Is this normal behavior? The car has 52k on it. I have only owned the car for about a month so don't know what to expect.

-Don

Sorry I accidentally posted this in the 997 section. I would move it but really not sure how. So feel free to ignore this post :)

-Don

Edited May 23, 2012 by barlowdo

[logray]

Sounds like you might have a failing or failed baffle inside your muffler. Or perhaps a loose exhaust bolt somewhere.

Have someone start the car cold while you are looking at and holding the muffer, it should become apparent where the noise is coming from.

[wvicary]

Or heat shield loose. Also inspect the welds for the tail pipes as I've seen a few of these broken.

[barlowdo]

Thanks and I should add that the build sheet says it is Stainless Steel exhaust.. Not sure how to prove that it is. I use to try and stick a magnet to Stainless and if it did not stick I could be pretty sure it was not normal "Rusty prone" steel, But I notice now that the Stainless Steel BBQ grills a magnet will stick to so that throws off my test :(

[logray]

Welds can break, bolts can rust and break, bolts can work their way free...

[Morten Astrup Steen]

My former C4S 2003 had the same, loose heatshield. P-shop fixed it every 6 month when serviced but the rattle came back... My 2010 Targa 4S doesn't rattle at all ;-)