when your on it and let off does it make the sound..if so it is the belt. where does the sound come from?? I have a chirp in my car as well...but it is the rear left brake........... when I am driving slowly. How many miles are on your car? could be the SC, is there play with the pulley?
Chirping Sound
My M90 seems to be making a chirping sound almost like a belt sound, but its not the belt. It doesn't do it at idle but I hear it when IM driving. IM beginning to think its a bearing. What do you guys think, is it hard to replace bearings in the M90, and where do you buy them? 
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Hopefully you have a hydraulic press handy
Actually, my 95 SSEi is doing the same thing but only at idle. Also checked the coupler for wear, and there is a little bit of play in the pulley. It makes a nice grinding noise at idle but when you hit the gas the squeak and the grinding noise goes away and can't be heard anywhere from about 2600 - 5700 rpm
The coupler is an easy fix if you are somewhat car literate and have confidence. Don't let the term "supercharger" scare you off from doing a repair on your own, because honestly the hardest part is evenly spreading the gasket maker when your finished the job. Also if you do it yourself you'll know how it was done and what was put in, plus you get the satisfaction of doing your own repair and saving money!
Now, ive never replaced the bearings in the intake end of the supercharger because im almost certain you need access to a hydraulic press to press the casing back together. I could be mistaken though, ask around.
Matt
Actually, my 95 SSEi is doing the same thing but only at idle. Also checked the coupler for wear, and there is a little bit of play in the pulley. It makes a nice grinding noise at idle but when you hit the gas the squeak and the grinding noise goes away and can't be heard anywhere from about 2600 - 5700 rpm
The coupler is an easy fix if you are somewhat car literate and have confidence. Don't let the term "supercharger" scare you off from doing a repair on your own, because honestly the hardest part is evenly spreading the gasket maker when your finished the job. Also if you do it yourself you'll know how it was done and what was put in, plus you get the satisfaction of doing your own repair and saving money!
Now, ive never replaced the bearings in the intake end of the supercharger because im almost certain you need access to a hydraulic press to press the casing back together. I could be mistaken though, ask around.
Matt
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