When starting my 1985 12A, I notice a whining type noise from the engine bay, that only occurs after the engine has been run long enough to warm up.
Have never heard when starting cold.
This is not a metalic sound that I would associate with starter / ring gear issues.
The previous owner made some comment relative to RPM warning, but have no idea if this is a reasonable comment.
Any advise would be appreciated.

 

If it's non-metallic, I'd think it is a vacuum leak.

 

Mine does the same, dunno what it is tho.

 

Whining sound, I've got that too. I haven't been able to pinpoint it quite yet but I think I'm getting closer. I could tell that with my girlfriend in the passenger seat I could hear it and without her it went away. It sounds like a female voice and seems to be somehow related to the loud exhaust and the stiff ride.

 

^bump

 

Is it a whistling or a whining. If it's more of a whistle than I can understand it being a vacuum leak. Otherwise check your belt tensions. A belt could be to tight to where it's binding on a pully or to loose so it could be slipping on a pully. More description on the noise and perhaps it can be pinpointed. Where abouts in the engine bay is it coming from the front or the rear. Easiest way to find out is have someone start it up for you and then stick your head under the hood and listen. (Don't wear loose clothing or you could loose a body part) That should narrow it down some.

 

Is it a whistling or a whining. If it's more of a whistle than I can understand it being a vacuum leak. Otherwise check your belt tensions. A belt could be to tight to where it's binding on a pully or to loose so it could be slipping on a pully. More description on the noise and perhaps it can be pinpointed. Where abouts in the engine bay is it coming from the front or the rear. Easiest way to find out is have someone start it up for you and then stick your head under the hood and listen. (Don't wear loose clothing or you could loose a body part) That should narrow it down some.

 

maybe someone installed a supercharger when you weren't looking

 

it is only when the starter is turning after the engine has warmed up. It goes away once the engine is started.

 

Just out of left-field here, but is this perhaps something to do with the hot-start assist motor?

 

hmm, will look into that.