When I started the car after sitting for a couple of days, I noticed a ticking from under the hood. When I lifted the hood the noise had stopped before I could locate it. Next cold start i had the hood up already. The ticking seemed to be comming from the S/C and seems to quit after about a minute of idle. Any ideas. Are there lubrication requirements or maintenance that ay resolve it. I have always been pretty **** about letting my cars idle for a few minutes before driving.

 

If you are certain the noise is from the supercharger (and not the secondary tensioners!), probably need to replace the supercharger pulley - mine sounded exactly like that, replaced pulley, no further noise 40,000 miles later. There are no lube points on the supercharger, but the manufacturer of the s/c does recommend changing the supercharger oil periodically - details here:
Parts:
You will need two bottles of GM supercharger oil, GM p/n: 12345982 , this can be purchased at any GM dealership

Tools:
Turkey baster
Short hose- needs to fit over end of turkey baster, and in s/c plug, about
6" long.
3/16 Allen wrench or hex bit

NOTE: Make sure that your engine is cool before starting this!

1-Unscrew the super charger oil inspection plug (a black plug at the front of the
super charger snout using a 3/16 hex head).

2-Insert the tube (that's attached to the turkey baster in to the hole and suck out as much oil as you can. This may have to be done many times to remove as much of the oil that you can. Dispose
of your old/used oil with your old motor oil in an environmentally SAFE manner.

3- Add the oil until it fills the snout to the bottom of the threads. It will take almost two bottles. Be careful to NOT overfill!

4- Screw the plug back in and do not over torque. 8-12 ft/lbs is more than enough!

5- After driving around for a day or so, check the oil level while the car is on a level surface. It's also a good idea to check the level of your supercharger snout at every oil change.


________

1999 XJR

 

Thanks Markus. I have read somewhere about that proceedure on the GM3800 S/C, so that is where the idea came from. I am kinda old school so I used a hose-to-ear to try to isolate the noise and it seems to be the S/C. I'll give it a shot. Thanks!

 

try taking off the belt for the supercharger and start it next time when its cold.

 

im getting the same thing sounds like its coming from the s/c but it almost sounds like a bad bearing how do I know sounds like a bad water pump sound fades in and out?? does anyone know what it could be?