Thread: Supercharger noise and questions

What a way to start my first post here! I have an 05 Grand Prix GTP with 3800 SC in it. About a week ago I noticed a ticking noise that I thought might be the alternator bearing. I was having trouble figuring it out. It was noticable a first only at idle and mostly when cold. But it kept getting louder. Now it sounds like a rock in a tumbler. It goes away on acceleration.
Now thanks to this forum and all the threads I have read, I believe it is the coupler so I will probably be ordering one from ZZP soon. In the mean time I think I can remove the SC belt and drive it that way. It looks like the belt only drives the SC. Will someone confirm that for me?
Is there any upgrades I might want to consider while I am in there doing this?
It also looks like on my 05 the Alternator bracket is not as much in the way as it is on older models...is that true?

Thanks,
Dwayne:

Thanks for the replies guys. I ordered the coupler last night. I also ordered the ZZP SC oil. Is this stuff okay or should I go with the GM oil instead?

Like I mentioned above it looks like the alternator bracket is not as much in the way on the newer 3800s like my 05. Can anyone say if that is true or am I going to have trouble with it?

Thanks again, it is nice to have a place like this to go to when you have a problem with something you have never worked on like an SC.

Okay, I took the belt off and the supercharger pulley is still turning and the rattle is only a little quieter. Does that sound right to you guys. It does quieten down a lot more when I rev the engine but comes back at idle.

Originally Posted by Bio248

the blower will still turn because of the air going past the rotors. turn the motor off and turn the pulley by hand. still hear it?

I can't hear anything turning the pulley by hand. I have one of those stethescope things and tired it out. I really couldn't hear much a the spot where the coupler is but the noise was louder at the throttle body end and really loud next to the pulley. I am not sure but I think this is still the coupler. I have heard that vibrations and noise sometimes transmit themselves to the other end of shaft.

Is there anything else it could be? I think some of the noise was that injector cover. With it gone some of the rattle is gone.

The car only has 35,000 on it. Is this common for such low mileage and no I haven't really trashed it or drivien hard.

Yeah, It hought the mileage was a little low too but the only way to be sure now is to open it up...which is my next step as soon as the part gets here. I guess it will get a new coupler either way once it is open.

I wish I knew for sure that this is it. The car runs fine otherwise, it pulls fine, doesn't miss, no leaks or smoke, guages are all good. This makes my head hurt...

Originally Posted by bluegtp91

Gen V...it could be rotor slap

What causes that and how do you fix it?

Coupler should be here tomorrow. Maybe after that I can crack it open and see what the problem is.

a bad PCV valve will make a terrible grinding noise coming from the blower area. run the engine and take off the oil cap and see if it stops. i had that issue on my car and i didnt find out till after swapping the tensioner, blower and water pump

do like i told you and open the oil cap with the engine running and see if it goes away.