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Well , put a rubber tube (1/4"ID) hose to your ear.
now find the hissing object, then post the name of object.
if unsure the name, post a photo pointing to it.
simple huh?
btw hissing is normal at the throttle valve. if the air clearner
fell of of some silly kid put on CAI mods. (99% CAI are BAD news.)
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This is pretty normal, the way the system works is by forcing liquid freeon through a orifice, the liquid turns to gas and gets very cold, the hissing is that process. You might be a tad low on freeon, but you shouldnt be worried.
I would first try to locate the source of the hissing. Try spraying some engine starting fluid around the hissing area and home in on the source. The engine revs will change as the starting fluid is drawn into the engine. Sounds though more like a vacuum as you have suggested.
It sounds like you have a vaccum leak to the engine. with the engine running at idle listen to see if you can hear a hissing noise especially around the intake manifold
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