Hello,

First time posting here. I own a 2005 S40 T5 AWD. Awesome car, but I'm concerned about the noise I hear on start up. I'll hear it during acceleration as well, but it's loudest at startup. If the car has been driven, I can stop it, run an errand, come back out and it stays quiet. So it's most apparent after the car has been sitting for a while.

I let it sit overnight and took a video this morning:
Hopefully someone here has experienced this before and can point me in the right direction. The car runs smooth, but the noise is driving me nuts and I'd rather be proactive about it than wait for something to become a problem.

Thanks so much!

 

Hard to tell... Possible exhaust leak? Does it eventually quiet down if you let it warm up?

 

Absolutely. Once it warms up, it stays quiet.

How might I determine if it's an exhaust leak?

Thanks for the reply!

 

That symptom sounds like an exhaust leak. Once the exhaust heats up and expands, it closes the leak. Best way is to put the car in the air and start it cold to try to pinpoint it while looking around the turbo and manifold. Might even see black marks where the leak is. A smoke test can also find leaks.

 

Hey, just wanted to say thank you! I'm going to investigate this; I'll let everyone know how it goes.