Noisy problem [video include]

[Stryke911]

Thank you for your advise, I'm going to change my spark plugs in few days (+ coils, etc.) because they are too old... but I don't think that it's the source of my problem...

In addition, i'm going to buy and use a mechanical stethoscope for isolating this noise...

If you have any more idea, do not hesitate
Keep in contact!

[BoxsterLS376]

It sounds to me like to have a bad roller somewhere. These things can be a pain in the ass but if you are handy shouldn't be that hard to find.

I would recommend opening up the access panal in the car so you can access the front of the motor, belts etc. Easiest thing to start with is to "stethescope" (SP?) everything with a long screwdriver or any long solid metal rod but a screwdriver works best. Press the tip of the screwdriver on the suspect areas and put the handle up against your ear. Everything should sound nice and smooth until you get near the problem pulley which should be quite noticable.

Other thing to do is to pull the belt off and spin everything, sometimes it is harder to tell as you don't have as much tension on the rollers but if there is a problem you can generally feel it or the roller will not spin freely. Check everything that spins...

If you are still not having luck then wait til the car is cooled down and run it without the belt for a second and see if the noise goes away... if not you may have a bigger issue...

Good luck!
J