: Supercharger like whistle?

Old Skool Soldier
06-16-10, 12:46 PM
Hey all, OSS here, long time reader and admin from camarosource.ca

97 STS 150KM's

I noticed it has a whistle like sound when I'm driving..could it just be the airbox? I thought it might have been the PCV, but replaced that and still the same. Any thoughts?


06-16-10, 01:38 PM
It has to be either some sort of vacuum leak or a pulley/tensioner running low on lubricant (main serpentine tensioner pulley, idler pulley, or a/c compressor clutch pulley bearings; p/s pump) or the water pump drive belt tensioner pulley (driver's end of the front intake cam).

Old Skool Soldier
06-16-10, 02:31 PM
Could be a pulley..I know at idle I hear a clicking sound from what I assume is a pulley.


06-16-10, 09:51 PM
If it is coming from behind the P/S pump, it's the over pressurization valve. It's in the tunnel behind the P/S pump. Geta long stick and push inward on it. It's a big flapper door. If the noise goes away, it's the seal.