What could this noise be?

[vtl]

Vacuum leaks affect LTFT (and STFT when they are huge). Easy to check with any OBD reader.

[scot850]

These engines on the P2 can get loose exhaust manifold bolts/nuts which then causes a blow.

Neil.

[dikidera]

So, I got the spare brand new pump + gasket I had lying around but completely forgot the stethoscope.

Is there anything that could go bad if I run the car without the serpentine belt which will not spin the alternator.

[vtl]

No.

[jonesg]

So, I got the spare brand new pump + gasket I had lying around but completely forgot the stethoscope.

Is there anything that could go bad if I run the car without the serpentine belt which will not spin the alternator.

i drove mine home 40 miles when the acc belt broke,
i made it and the car still had enough power to crank again when i got home.

[jonesg]

when it starts whistling loosen the oil dipstick and see if the noise goes away.

[famfeld]

Disconnect serpentine belt and run to see if it goes away

[dikidera]

Late to the party but I just got back. I removed the serpentine belt, started the car and the noise was gone. I noticed the serpentine belt tensioner's pulley was first hard to turn and had no inertia to it at all, secondly it had some radial play. I am guessing it has gone bad. The alternator pulley was normal and I couldn't tell anything about the AC compressor. The PS pump had some slight axial play.

I reinstalled the belt, started the car and sure enough the noise was back. So while I can't say it's from the tensioner for sure, it is coming I believe from a belt accessory.

[vtl]

Don't run it like that, it may cost you an engine.

[dikidera]

I don't really have a choice until I get a replacement part Monday or at best Tuesday.