Originally Posted by Wolfedog50
Ok.. here'* the deal. I've had a rattle at idle for a long time. Ok, i know that is the coupler. Havn't replaced it yet. Going to do that soon. A new problem has arised that i think is the supercharger also. It started from when i step on the gas hard it makes the horriable grrrrrr noise. I was talk it was the bearings in the water pump..... WRONG.... still does it. It does sound like a bearing to me though. As of recent the rattle at idel has become more of a intermintant chung. It'll run ok then go Chung spraticly every 5 secs or so. When it chungs the idle pully moves a lot too. Also now when i step on the gas.. even very easy... the car jerks a little.. has some hesitation.... It still jerks a little, but not near as much at high RPM'*.... Supercharger bearings maybe.
Ok, taking this piece by piece. If you know your coupler (and it sounds like it is) is going south on you, do the nosedrive seals and bearings at the same time. You need to pull it open anyway. This will rule everything else out. However, I'd say that noise and symptom would be more likely caused by missing teeth on the gears in the SC nosedrive. This can be BAD. It can cause rotor clash. Until you really isolate it, be VERY careful.
Keep in mind that the boost is entirely bypassed at idle. The SC has no effect on idle quality normally.
How'* the oil in the nosedrive, how long since the last change, and how much boost at WOT?