I have a sound that only happens during a cold start-up. Once the engine is fully warmed up, the sound goes away completely.

To me it sounds like it's coming from the crank pulley area.
The sound kind of reminds me of the noise a washing machine makes while it's agitating.

I've been doing a search on "noises" and TSB's but I can't find any answers.
Any help would be appreciated

This is a 06 IX

Thanks

 

A video of the noise would help

 

i have noise in 3000 to 4000 rpms in neutral like iron whit iron very bad song
any idea ?

 

Search on timing belt hitting the crank sensor.

 

sounds like you have something rubbing. Some kind of shaft rub or something. You have something out of balance, or maybe a warped crank pully or something.