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Old 06-18-2012, 11:46 AM   #1
rgrwilco
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Default '12 impreza hissing sound

I put about 11k on my impreza so far, and it seems to have developed a few noises along the way.

1. Every time i depress the clutch, I hear something that sounds like a lot of air being pushed out of something very quickly.

2.while lightly accelerating, there is a loud hiss with a bit of a metallic sound to it. Dealer says its normal, but my car sounds like crap and it only recently started doing this. If I push the gas just a bit more, the sound goes away.

If its normal, its one thing, but the fact that these noises just recently started happening worry me a bit. The hissing only happens while in gear, so I'm thinking it might be something with the transmission if it is anything. Gas mileage has also decreased by 4mpg over the past couple months.
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Old 06-18-2012, 12:11 PM   #2
auskip07
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Mine has the same hissing sound underaccleration. Been there since i picked up the car. My MPG is hovering around the 27-31 mpg range depending on the amound of HWY miles are on the tank.

Thats the only one i can relate to.
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Old 06-18-2012, 12:29 PM   #3
Furiousd1983
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Mine hisses everytime I shift under acceleration. It's the Air intake.
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Old 06-19-2012, 03:40 AM   #4
mtdewroo
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Default shift noise

Mine makes the same noise's too. It feels like a cheap gear box. First and second gear shift the WORST! ( I have never rolled through so many stop signs to avoid taking off in first) I constantly have to double or triple clutch to get into reverse with out grinding it!

2012 impreza hatch premium with 10,600 miles. (10 weeks old)
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Old 06-19-2012, 08:03 AM   #5
auskip07
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Quote:
Originally Posted by mtdewroo View Post
Mine makes the same noise's too. It feels like a cheap gear box. First and second gear shift the WORST! ( I have never rolled through so many stop signs to avoid taking off in first) I constantly have to double or triple clutch to get into reverse with out grinding it!

2012 impreza hatch premium with 10,600 miles. (10 weeks old)
I took mine in because it was grinding when put in reverse. If you push in the clutch pause.... maybe 1-2 seconds then put in reverse it wont grind. Its just a matter of getting the clutch plate to slow down.
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Old 06-20-2012, 03:59 AM   #6
mtdewroo
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Thanks I well try that.
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Old 06-20-2012, 11:45 AM   #7
rgrwilco
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I think it's the gearbox too. If I'm not in gear and rev up the engine, sounds fine. Glad to hear others do the same. I'll take the noise over a cvt any day.
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Old 06-21-2012, 10:10 AM   #8
mckinnon99879
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the hissing under acceleration is from the air intake...
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Old 06-21-2012, 10:44 AM   #9
Commander Keen
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If you punch the throttle in neutral, you'll hear it then as well.
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Old 06-21-2012, 11:13 AM   #10
darkbug
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It's just the intake. If you put a highflow airfilter or a CAI on ur car it will get louder... On another note the intake on this car is the loudest stock intake i have heard.
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Old 06-21-2012, 11:19 AM   #11
Commander Keen
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It is loud. The intake plumbing is fairly short and the silencer is small. I'd sooner mod it for lower noise than better performance.
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Old 06-21-2012, 11:33 AM   #12
rgrwilco
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Quote:
Originally Posted by Commander Keen
If you punch the throttle in neutral, you'll hear it then as well.
I don't hear it at all in neutral.
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Old 05-31-2013, 03:04 PM   #13
dirtyalloys
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It's the air intake. The noise has been there since day one for me. I notice it hisses around 2-3k rpms. Or when I downshift and floor it, it will hiss really loud for a split second.

I personally like the sound...it doesn't sound bad or anything.

Oh yeah, im driving a 2012 impreza sport premium 5 speed MT with 10k miles.
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Old 06-02-2013, 06:32 AM   #14
kshiz
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I've also had this hissing from day one. Strange that it seems to be audible only on manual Imprezas.
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Old 06-02-2013, 12:09 PM   #15
flyers25
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I've have been hearing this noise since day one as well (2013 Premium Sedan - 5 speed).

When inside the car with the windows up it sounds more like a hissing noise. Almost like an air leak or something.

Outside of the car it sounds more like a metallic squealing noise.
Sounds worse (louder) if there is something for the sound to reflect off of.. like the side of a building or something.

Only happens at light, partial throttle.
Doesn't seem to be linked to engine speed (RPM) as it will happen at any RPM as long as I am lightly pressing the gas pedal.

I notice it the most when I'm driving down the highway at around 50 mph and need to give the car a bit of gas to maintain speed. It chirps.

I haven't been able to duplicate the noise while in neutral. Can only duplicate it when in gear and driving down the road.

I'm not convinced that it's the air intake.
If that was the case I think I would be able to duplicate it in neutral.
But I could be wrong.

I'm wondering if it's a whiny fuel pump or something.
There is a TSB out for a similiar sounding issue in the BRZ (09-54-12R:High-Pitched Chirp, Squeak or Cricket Sound from the Engine).
Wonder if it could be related (similar part).

The CVT models have an extra noise insulator attached to the hood lid.
Perhaps that would explain why CVT owners haven't noticed the noise?
Or maybe the CVT's inherent whine is enough to mask this noise?

My car is just about due for its first oil change. Going to bring it up with the dealer then. However, based on past experience I'm pretty sure the dealer will just tell me its normal or that they cannot duplicate it.

All in all it's not a terrible noise and I've already gotten used to ignoring it.
But I would prefer to not have to hear the chirps and squeals for the next 100,000 miles.
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Old 06-02-2013, 08:55 PM   #16
sgoldste01
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I also have a 5MT and I can't say that I've ever heard this hissing noise when I shift. I hear the engine rev, and it seems to hold its RPMs high when the clutch is engaged during a shift for a longer time than I'm used to experiencing in other cars before winding down, but I wouldn't describe that sound as hissing or chirping. It just sounds like a normal boxer engine sounds when revving.

So I guess I'm unfamiliar with this hissing sound others are reporting.
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Old 06-15-2013, 09:36 AM   #17
Mikevtellem
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I have a '13 sport 5mt and I have had this since day one. If I tap the throttle, it chirps. If I am cruising and give it a little gas, it hisses. Sounds almost exactly like when I had a small boost leak on my 03wrx. Like many of you, I have traced it back to the intake. My friend has the '12 sedan 5mt and his does not do this.

Also sort of related, I get an annoying metallic vibration sound from the exhaust whenever I rev or accelerate. I'm assuming it is relates to the heat shields. (Really noticeable when driving next to something: parked cars, buildings, Jersey wall)

Have any of you had that issue as well?

Last edited by Mikevtellem; 06-22-2013 at 12:39 AM.
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