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i have a 2004 honda civic dx vp with a auto.when i hit the gas it sound like a blow off valve is going off but its very low and short(last for about 1/2 a second)could it be a vacuum tube is loose or something?

 
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Is it more of a sucking sound? Cuz your car does suck...

really it does, probably just your intake buddy, if it was a vac hose your idle would be all over the place.

 
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what he said i hate noobs

 
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unless your turbo your always in vac, and will never "blow off"

 
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at first i thought you were gonna ask if theres a way to put a blow off valve on a n/a. haha but yea its the intake. and youll hear it more if you get an aftermarket intake.

 
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it especially sounds like that when its cold and driving the car slow for a while till it starts getting warm

 
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i asure you its not the intake.i know what the intake sounds like and i know it is not that.its a akward noise thats sounds like a very high pitched blow off valve only when i hit the throttle and let it go. and by the way im not new to this i just had a simple question

 
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where do you hear the noise. in the engine bay. exhaust and do you have any mods.

 
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*******

 
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all i have to say is.....VROOM....PSTTTTTTTTT

 
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probally an exhaust leak. check the bolts on you exhaust manifold

 
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hah thats what i was thinking

 
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im sorry who are you?????


BTW i was just kidding god

 
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check your throttle body. check if there is carbon buildup, usually you get a really high pitched whistle if there is excessive air when the plate is closed.