Low whining sound from undercarriage

[Dynomite]

Originally Posted by ZR11974

Good morning to all. I hope this email finds everyone well.
I am a new ZR-1 owner and am hoping I can draw on the vast knowledge, here.
The car is a white 1990. It only has 30K on it and is in excellent condition. I love the car. Lifelong goal achieved by getting the legendary LT5 underfoot.
However, I am experiencing a low whining/whirring type sound from under the car. It does not seem to be changing the cars performance. It's just a concerning sound, and it's loud.
It does not appear to be exhaust.
It is not throwing any warnings, and none of the battery, oil pressure/temp, or normal temp gauges are effected by it. Neither is the idle. It sounds like it might be a belt. But, it starts and ends while moving or sitting still, and it never continues once I accelerate. And, as best as I can tell it appears to be coming from the front/center of the car, not the rear.
Steering also doesn't seem to be related.
I keep trying to isolate some consistency with it, but no luck so far.
And, as I've said, it is loud. Almost like a smaller engine is revving, but not the LT5.
Since it comes and goes with clutch release and depression...sometimes...clutch is my gut feeling.
Any troubleshooting suggestions? I have considered buying a code reader, or using a paperclip trick I read about to see what is stored on the ECM.
I absolutely adore the car, and this weird *** sound is the only thing I'm concerned about.
Thanks for taking the time to read all this, and I hope the day treats you all well.

Respectfully,
Geoff

Difficult to understand exactly when you hear this "smaller engine revving".

Seems most likely Serpentine Belt or tensioner but then you associate Clutch operation which is confusing

We have the AC, Water Pump, and Power Steering as well as Alternator rotated by Serpentine Belt Also.

[ZR11974]

We can all rest assured I am confused, as well. Haha.
I have not changed the fluids, yet, but considered that. And, I am almost certain it's not the well-documented ZF gear whine. I think I hear that, and I actually love it. Haha.
I'll check out the Serpentine belt, visually and see if anything looks amiss.
And, I'll see about reaching out to some of the Texan locals!
Thank you very much for the ideas, and suggestions.

Geoff

[Mystic ZR-1]

Pilot bushing?

[DRM500RUBYZR-1]

Originally Posted by Mystic ZR-1

Pilot bushing?

Great minds think alike hah hah.

How loud is loud?
Is it always there or does it come and go.
Is it loud enough that when it starts, does it get the attention of the car next to you?
Is it a "howling" noise.
30k miles is about the mileage my first ZR-1 had when the pilot bushing went.
It spins around in the crank and can make a variable pitch, variable volume noise that starts on its own and can disappear at times. (at least in the beginning)
My car would scare adults at the corner when it would decide to howl.
Marty

[Mystic ZR-1]

Originally Posted by DRM500RUBYZR-1

Great minds think alike hah
Marty

Scary...