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Posted on Jan 02, 2017
First you need to isolate the noise. You don't mention the mileage on the car. Do you have the supercharged engine? If you do, remove the belt for the super and make sure that is not the problem. If you still hear the noise approximately below or from the super area, it is most likely the belt tensioner pulley.
In my car there was a large washer over the pulley (original equipment), as the pulley wobbled on the bad bearings, it would cause a sound like a bad alternator or gear whine getting exponentially worse the faster the engine reved. Now that the part is replaced, you can barely hear the engine idle and is significantly quieter at high RPM.
My car - 2004 Pontiac Grand Prix GTP with 66,000miles.
Posted on Dec 30, 2008
There may be a small hole or cut in a vacum line or possibly just loose. Also make sure the air filter box and the big hose to it are secure and clamps etc are tight. Pulleys and belts can make a high pitch sound also.
Posted on Mar 22, 2009
SOURCE: when i give my car gas a whistle comes from the engine. It's a high pitch continual sound. When i let off the gas the whistle stops. It sounds like it's coming from the top of the block.70k miles Thun
Sounds like a vacume leak, chk. for a cracked or broken vacume line or maybe one came off. Does it idle ruff? With it running open hood and listen for a low pitch whistle you may have to rev it up a little.
Posted on May 31, 2009
with engine off check fan blades and shrould (plastic around fan) for cracks or if loose also check tailpipe bent at end if you backed into something. also check air filter box to make sure its tightly shut.
Posted on Aug 30, 2010
It could be a number of things, first check if any vacuum lines came off you will get a noise from the air entering the line that has popped off, secondly it could be one of the pulleys having a bad bearing, the belt tensioner pulley the water pump, the alternator....
Posted on Dec 06, 2010
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