Idle/Belt noise at idle PERSISTS!!!!

A&Q about 350Z
Q:

Ok, so I've been getting this noise (which I thought was belt squeal) only at idle. I notcied the lower, smaller belt was looser than the crank belt. So I tightened it tonight. But the noise at idle persists. It is definitely a belt or pulley. WTF could it be? Do I possibly need a new belt? Is it a bad pulley?
The belts are tight now and it is still doing it!
PISSED!
A:

Isn't it still under warranty?
Take it to the dealer, should beable to fix it, and for free.
A:

Yeah, mine's making that same noise. They couldn't "hear" it last time. I took it to the dealer over my lunch, but I didn't have time to leave it, and they heard it. I have no clue what it is, but it's been going for a few weeks, and my check engine light came on today.
2003 Enthusiast Redline 6spd.
Nismo CAI
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