Whining noise

[RichNJshore]

I am hearing a high pitched intermittent whine occasionally during acceleration. It doesn't last and comes and goes. My first thought is a belt, but last year I had all new belts and a new belt tensioner installed. Also it doesn't sound like the typical squeal of a slipping belt. It sounds almost like a whistle. No power loss noted. No problems with oil pressure or temp. No charging loss noted. It comes and goes pretty randomly, but almost always on acceleration off a light. I haven't checked it out yet, but I thought I'd check in here before since I won't have the chance to check it till Friday and since I always get great advice here.

1993 LT-1 coupe

 

[DRTH VTR]

I am hearing a high pitched intermittent whine

You aren't dating my ex-wife, are you?

 

[gmjunkie]

Alternator bearing,Idler bearing,Vacuum leak whistle!

 

[G Winter]

I vote alt. bearing or brushes.

Glenn

 

[RichNJshore]

You aren't dating my ex-wife, are you?

LOL
I don't know is she a Torch Red Beast with the power of 300 horses?

 

[RichNJshore]

Any way to differentiate Alternator from others? There is no other noticable drop or fluctuation in Voltage....

 

[gmjunkie]

Any way to differentiate Alternator from others? There is no other noticable drop or fluctuation in Voltage....

I use a mechanics stethoscope, and put the end of it by the bearings!! But you can use a dowel or short broom handle!!

 

[67HEAVEN]

Do you hear it with the radio power turned off? Not just sound down......radio OFF.