My '89 came with BOSE and often hear a noise (like a whistling or whirring) that gets higher in pitch as I accelerate. WTF? Anyone have this problem? What can I do? Also, the sound is there no matter what mode the headunit is in (radio, CD, tape...)

 

This typically happens with amps drawing too much current from the battery. Its called electrical squeel I believe. Its more known to happen on higher wattage systems, I've never heard of it on the Bose..dunno, I'd kick it maybe?

 

it could also be either alternator or spark plug noise. have you changed or modified either of these? also spark plug wires can radiate noise as the get old and deteriorate.

 

could be contaminated power. You're picking up stuff from your alternator that's bypassing your regulator. Check your grounds for corrosion, loose wires, blah blah, you get the idea. It can also be EMI (electro-magnetic interferrence) from the plug wires. Since you have a VG i would go ahead and get new plug wires. What's the worst that can happen? Whether it fixes it or not you get new plug wires.

 

Which connections should I check?