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Hissing sound from intake manifold

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Old Aug 23, 2012 | 08:22 AM
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RenosEVO's Avatar
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From: Reno, NV
Hissing sound from intake manifold

Hey guys I just noticed yet another problem in my Evo
So before I start the car and put the key in the ignition I can hear a hissing sound coming from the front of the engine by the intake manifold? It sound like I'm losing boost but my car isn't on. People were saying it's a vacumm leak because the vacuums tend to fall off but I can't seem to see any hoses off. Should I try by looking under? I'm not sure what to do but it doesn't seem to mess with the car it runs fine
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Old Aug 23, 2012 | 06:57 PM
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From: Ohio
are you sure its not a big snake?
You could have hoses with pin holes in it not necessarily 'off'.
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Old Aug 23, 2012 | 10:38 PM
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From: Reno, NV
Originally Posted by GTijoejoe
are you sure its not a big snake?
You could have hoses with pin holes in it not necessarily 'off'.
Haha I hope it's not a snake
Yeah that's true. I heard I can use carborator fluid to spray the hoses and find out the problem?
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Old Aug 24, 2012 | 12:38 AM
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Don't understand why you would have vacuum without the car started. Maybe it's fuel related because the fuel pump primes when the key is turned but not cranked.
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Old Aug 24, 2012 | 02:41 AM
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From: washington dc
+1 (that is really weird)
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Old Aug 26, 2012 | 05:42 PM
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From: Reno, NV
Originally Posted by Ekoy
Don't understand why you would have vacuum without the car started. Maybe it's fuel related because the fuel pump primes when the key is turned but not cranked.
That is what I was thinking also because it is not started. It has to be fuel related but I'm not sure what. Should I trying getting a new fuel pump?
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