Thread: Supercharger sound..

The 95, no. What year is your car? assuming its a 97-03, in which case you need a Gen 3.

What kind of noise is it making? Rocks tumbling is the coupler. Take the belt off and see if the pulley has any play in it.

Could have possibly injested something, and chipped a rotor. Also, needle bearings could be shot.

Can you take a video of it?

Metal doesnt really make a sound, it just sorta sits there....

Is it a scraping sound, grinding, or is it a clanking sound?

could be a bad a/c clutch. take the other belt off see if it goes away as well.

My 02 GTP would make a bad knocking noise...thought I had rod knock. Ended up being the A/C Clutch. if I turned the AC off, it went away. Back on, it'd start knocking. Though sometimes they do grind while free spinning.

Okay, so it's a rattling noise.

Pop the other belt off, see if it goes away. If it does, it's either the AC gone bad, or possibly a totally shot tensioner (they chatter like that once they go bad)

Look at the tensioner where the alternator is mounted. Is it bucking back and forth?? There's a chance that it could be the S/C and the rotors are hitting each other a little, but I would think that noise would be faster.


Get a long wrench or screwdriver, and put one end against various parts of the engine, and the other end against your ear. It will transmit the sound like a stethoscope. (please dont use the pointy end of anything against your ear)

Do that to the S/C, tensioners, LIM, etc, until you find where it is the loudest. Then, try to isolate exactly where it's coming from.

Yep, just be careful. Dont get fingers/hair stuck in spinning things.

Originally Posted by machinegunsquid

My 02 GTP would make a bad knocking noise...thought I had rod knock. Ended up being the A/C Clutch. if I turned the AC off, it went away. Back on, it'd start knocking. Though sometimes they do grind while free spinning.

Change tune to drop A/C past 50% throttle.

That GP has been gone for years

when you say the crank moves, in what way, like you turned the engine some? <<<normal

or side to side play or in and out play?<<<<<not normal

oh the a/c clutch, the part the belt rides on should turn, they dont always spin smooth sounding, but it should snug.

the center of it should not turn freely. thats the compressor part, it only spins when the a/c is on.

if you turn the a/c on and the noise goes away its the clutch bearing going bad. and you would need a new compressor.

unless the balancer on the crank is shot. like the pulley part turns on the mounts or its loose. it sounds more like the a/c clutch.

post up a vid if you can, that helps sometimes. lots of ears.