Ed, This rattling noise is usually caused by the supercharger coupler plate and is, in most cases, not a critical issue. Fixing this is not difficult.
Buick is GM and used the same engine as Pontiac, so your car most likely has an Eaton blower. Check to be sure!
You can fix this yourself for less than $50 USD and a couple of hours. I found the part (both OEM type and Heavy Duty replacement) at zzperformance. Com
Best of luck to you.
Wednesday, February 20th, 2019 AT 5:04 PM
(Merged)