supercharger L 67 or M 90

hey guys, so i took the belt off the supercharger started the car and the noise coming from that side of the engine was gone. :frown: . I dont know exactly what this I am going to bring the car back to the mechanic and have him look at it and diagnose. I hope its just the harmonic balance but we'll have to see. If I do need to replace the supercharger does anyone have anysuggestions on where to find one?

Does a 97 grand prix have the M 90 or L 67 supercharger?

You have the Eaton M90 Gen3 blower. L67 is just the GM RPO code for the option group which includes the supercharger and other goodies. Even my Regal GS is an L67.

If the noise went away that means you have a flaky tensioner, idler pulley or even possibly snout bearings or a coupler. On the SC parts are available at ZZPerformance. If you think you can do the work DIY we can help there. A lot of us have redone or repaired the supercharger.

Can you describe the noise?

its like this rattling noise that skips a beat. thats the best way i can describe it. it doesnt sound smooth anymore like the way it did when i first bought this car.

its like this rattling noise that skips a beat. thats the best way i can describe it. it doesnt sound smooth anymore like the way it did when i first bought this car.

If you can pinpoint the rattling noise to the snout area or the right hand side (passenger) of the main blower assembly where the snout is joined then it will be a bad coupler.

See link below:

http://www3.sympatico.ca/aepa/blowerinstall.html

ZZP has an improved coupler.