For a while now my super charger has been making a kind of chung/clank noise. Do you think this is due to. A) Blown supercharger gasket. B) Messed up coupler
C) Lack of supercharger oil. D) No, your stupid it'* (correct anwser here).

u r using premium gas right?

Does it only make the noise when ideling or all the way thru the power band?

In most cases when you hear noise from that area but only when ideling it is in need of a new coupler. If it is makeing noise while driving you may wany to sheck nearby components like your alterantor. One of the mounting brakets for the alt gets close enough to the SC where you might have troule telling where the vibration / noise is comming from.

Just my .02

Hi every1, sorry i know is not my post but my bonnie is also making that sound, and it does it when idling or otherwise when car is on park or not moving and in drive shift. I don't hear it, when I acelerate. How hard is to change the SC coupler and where is it located exactly?? Part #... How much $$$....What brand better???...

Thanx

Here is the thread that tells you how to do it to a m62 but your m90 should be almost the same proccess. IT is actually really easy yo do. I did mine myself and I had never been into an engine like that before.

http://www.bonnevilleclub.com/forum/...408&highlight=

It only does it at idel. I bet it is the coupler. Can i get one of those at the local auto parts store. Or to i need to get one off of another website?

Doubtful you can get just that from a dealer. I would go to the following link for it.

http://www.zzperformance.com/zzp/pro...sc_coupler.htm

You'll know when your SC is running low on oil (or out) because it kinda sounds like a screw in a vaccuum cleaner that gets louder with more PSI. Unfortunately, if you hear that, it may be too late and you will soon hear . I learned the hard way.

Hopefully its just your coupler like the other guyz said. If the whole unit was going bad, you'd definitley hear at at higher PSI.

Ok one more thing about it. When i hit the window up or down when i'm idleing. The chunging get louder. I guess it gets louder when i use more eletric power. any ideas now