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I have a 2001 Hyundai Elantra that started making a whistling noise once it gets hot. The noise goes a way when I push the gas peddle but comes back once I take my foot off the peddle. I think the noise is coming from the back of the engine near the fire wall but can not pin point it. Any help would be great.

Thanks

Chris

PS I would just like yo thanks everyone on here that has posted DIY stuff with your guys help I changed my speed sensor, brakes, and cleared up my foggy headlights.
 

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Looks like the PCV valve. Make sure the hose is on tight and everything is sealed. They're cheap and easy to replace if need be as well. Also, check the hose and make sure it isn't clogged (not likely but maybe...)
 
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