2001 Q45t noise from airbox

[Mrelcocko77]

Guys, I need help diagnosing what's causing this noise. It doesn't sound good. The video explains it in detail.

Please help

[Q451990]

to NICO! I remember your video from facebook a couple of months ago. The closest thing it sounds like to me is when I put a pulley together in the wrong order once, but you don't have belts on. I think I'd at least get the water pump belt back on so that you can run it longer. Then use a mechanic's stethoscope to narrow it down.

[Mrelcocko77]

I've used the stethoscope and still can't pinpoint the noise. I followed it all the way to the throttle body from the scoop sitting on top of the radiator.

[3Q Jay]

When did it start doing this, and what work has been done on the engine recently (your video mentioned spark plugs)?
On FGY33, you have 4 belts, but as Heath said, need at least the crank to water pump belt on so you don't overheat while troubleshooting.
I didn't hear you rev it....what happens when you vary RPM (don't go crazy), just change it and see if sound changes?

[98_Q45]

Idk if the issue has been fixed: but it sounds like what happened when I forgot to plug in the vacuum hose leading to the brake booster in my maxima. It’s definitely a vacuum leak sound...

I once had 2 vacuum leaks: an egr hose and the intake manifold.