Car information : 2011 / Lexus ISF / No accident / nearly on 60,000 miles / stock, no mods

Hi you all ~ what's up?
These days I suddenly found my F 's engine noise..
I'm glad someone give me an advice to this problem
At first, please watch this video

http://www.youtube.com/watch?v=VpWPe...ature=youtu.be

The noise sounds like reading hard disk when you turn on your computer.
I couldn't hear this weird sound when cold start.
Engine starts to sound like this after diving enough time.
I can hear the noise from the front section of the engine.
I think maybe the section is more front somewhere, more close to grill.
This noise can be heared easily at front upper grill or down grill with closed hood.
The noise itself is not loud, can barely hear it.
I tested that the noise is not relevant to engine rev.
The noise sounds steady when I put on the gas
I can not notice anything different in performance
Lexus has no idea about this sound, same as other maintenace shop
But I do realy want to know the cause of this sound
Anyone can help me ??

 

The video is tough to hear clearly, but are you referring to the clicking/knocking sound?

 

could be the tensioner

 

I have the same noise. Haven't diagnosed it yet. There are no performance issues yet...car is still running strong.

 

water pump would be my best guess from a tech perspective. remove belt and most likely has play in it.

 

I'm not sure that you and I are talking about same noise
Yeah ~ It's like clicking sound.. like that you click mouse button many times with quick speed and irregularly
I think there's no other sound except right engine sound and the noise I talked about

 

Oh.. you have the same problem
I'm glad to meet someone who have the same problem
I thought this issue is just happen in my case..

 

Yes.. I thought maybe one of the strong cause is water pump
However, other guys say that 2011 IS series has no water pump issue.
But I'll keep reminding about that

 

Yes.. I've heard that guess when I visited maintenace shop
But I have not check that thoroughly yet.
I'll check it and write about the result

 

It's not a guess. My car made the exact same noise. I replaced the tensioner and the belt. The noise stopped. I would start there for sure.

 

Oh realy? Ok ~ I'll check it as soon as posible
Thanks a lot

 

I just had my tensioner pulley and belt done too and that noise is gone here as well.
Now my car idles kind of like my old LS460. Smoother , quieter, and with mainly just the direct injection noise