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Old 05-18-2016, 09:43 PM   #1
Scooby Newbie
Member#: 420562
Join Date: May 2015
Default Random Hissing Noise

Ok so I've been reading through threads for a few weeks now and can't seem to find a definitive answer to my question.

When I'm driving I'll get a random hiss every now and then. It happens randomly and nothing specific seems to trigger the noise. It's noise level varies and sounds more like a "pssssssst". (Sometimes followed by a squeak)

On a side note, sometimes when turning at slow speeds the car seems to rumble very loudly...is this normal?

I drive an 07 Subaru Impreza with 113,000 miles and haven't heard this at all in the last three years I've owned it.

Any insight would be great.
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Old 05-21-2016, 01:10 PM   #2
Scooby Newbie
Member#: 420562
Join Date: May 2015

DZellz is offline   Reply With Quote
Old 05-22-2016, 11:51 PM   #3
Scooby Newbie
Member#: 444680
Join Date: Apr 2016
Chapter/Region: SCIC
Location: Riverside Area
2006 Impreza


from what happened to me, on the torque box connected to the throttle body itself where as the intake inlet tubing is connected to, there is a little connector on the passenger side front of the box, my clip broke and that piece was losing connection so it make a whinning hissing noise as I drove, sounded like a super charger as the rpms climbed. afterwards I fixed it with some duct tape and the hissing lightened up, but there was still a faint hissing still. after tinkering with the car some more, I found out that the exhaust flange gasket on the headers(Passenger side) was torn and the flange gasket from the headers to the catalytic converter mid pipe was torn as well, and there was a leak in it. I am in the process of replacing it right now with a 2002-2005 impreza 2.5rs headers, highflow mid pipe catalytic converter and cat back exhaust system, and hopefully that will stop the "hissing" sound that was left over, its not that loud or noticeable as the intake side "hissing" or "whistling" sound was though.
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