Throttle Blip Hiss - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Wepeel · 05-28-2014, 11:28 PM

So lately I've been noticing a quick hissing noise during throttle blip - first started noticing it when blipping for downshifts, but can induce it blipping the throttle from idle. I've seen the other threads that talk about a knock or pop during blip, and I definitely do not have that. It happens at a rapid blip of the throttle and just sounds like a very quick hiss, almost like you can hear the air induction. Noise won't happen in other kinds of driving, rolling on throttle, WOT, etc. No other odd noise otherwise.

Anybody else notice this?

humfrz · 05-29-2014, 01:02 AM

You may consider plugging up the sound generator tube at the firewall and see if you still hear the "hiss".

My 71 year old ears can't hear "hiss" and a lot of other sounds anymore ..... so, I don't know if my car hisses or not ..

humfrz

N1rve · 05-29-2014, 02:09 AM

It could be noise coming from the sound tube. Try covering it and replicating it.

ericmpena · 05-29-2014, 02:26 AM

Quote:

Originally Posted by humfrz

You may consider plugging up the sound generator tube at the firewall and see if you still hear the "hiss".

My 71 year old ears can't hear "hiss" and a lot of other sounds anymore ..... so, I don't know if my car hisses or not ..

humfrz

You're 71!?

N1rve · 05-29-2014, 03:51 AM

Quote:

Originally Posted by ericmpena

You're 71!?

And a veteran too I believe. One that can use a computer quite well.

gonzo · 05-29-2014, 03:52 AM

Quote:

Originally Posted by humfrz

You may consider plugging up the sound generator tube at the firewall and see if you still hear the "hiss".

My 71 year old ears can't hear "hiss" and a lot of other sounds anymore ..... so, I don't know if my car hisses or not ..

humfrz

Quote:

Originally Posted by ericmpena

You're 71!?

Yes, that's what he said!?

tjf · 05-29-2014, 07:25 AM

Quote:

Originally Posted by ericmpena

You're 71!?

No. His ears are 71.

Wepeel · 05-29-2014, 08:51 AM

Haven't tried plugging the sound tube, but it's audible from outside of the car and with the windows down.

humfrz · 05-29-2014, 10:43 AM

Quote:

Originally Posted by ericmpena

You're 71!?

Yep, if you saw me ....you'd believe it .....

humfrz

continuecrushing · 05-29-2014, 11:03 AM

I hear the hiss too...pretty sure its normal

humfrz · 05-29-2014, 11:12 AM

Quote:

Originally Posted by N1rve

And a veteran too I believe. One that can use a computer quite well.

Yep, Viet Nam era veteran.

Well, I had a head start with home computers, when I purchased my first one back in '82 for $99.95.

It was called a Timex Sinclair 1000 ...... and it was a screamer ....

Used a cassette recorder for data storage and a B&W TV for a monitor.

Anyone still with me .. ?? Anyone .. ??

OK, time to go eat my oatmeal .....

humfrz

Mr 286 · 05-29-2014, 11:35 AM

The hiss is definitely not normal. I had a similar sound occur about a month or two before the pilot bearing went out on my clutch (something I was told by a mechanic is quite common on Subarus). So, if you're hearing a sound like you've got a vacuum leak or hiss when you blip the throttle, it may be a sign that the clutch pilot bearing is about to go soon. Hissing will go away and come back intermittently. Then there will be a rattle when it does go.

Keep an eye on this and don't just write it off as normal noise. If it isn't something you expect to hear, then it is never normal noise. Hopefully yours is not as severe an issue.

strat61caster · 05-29-2014, 12:26 PM

I hear a clicking that's rather mechanical, I've always attributed it to the electronic throttle quickly snapping open the throttle valve when I stab the gas.

ZionsWrath · 05-29-2014, 12:29 PM

Video? I don't hear any "hiss". But my quiet may be your hiss, who knows...

05-28-2014, 11:28 PM	#1
Wepeel Senior Member Join Date: May 2012 Drives: '13 BRZ Ltd Location: PA Posts: 458 Thanks: 265 Thanked 229 Times in 117 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Throttle Blip Hiss So lately I've been noticing a quick hissing noise during throttle blip - first started noticing it when blipping for downshifts, but can induce it blipping the throttle from idle. I've seen the other threads that talk about a knock or pop during blip, and I definitely do not have that. It happens at a rapid blip of the throttle and just sounds like a very quick hiss, almost like you can hear the air induction. Noise won't happen in other kinds of driving, rolling on throttle, WOT, etc. No other odd noise otherwise. Anybody else notice this?

05-29-2014, 02:09 AM	#3
N1rve Senior Member Join Date: Oct 2013 Drives: 2019 BMW ///M4 Location: Los Angeles, CA Posts: 2,332 Thanks: 102 Thanked 1,167 Times in 714 Posts Mentioned: 28 Post(s) Tagged: 0 Thread(s)	It could be noise coming from the sound tube. Try covering it and replicating it. __________________ N1rve 2019 BMW ///M4 - Alpine White \| Sakhir Orange/Black Leather \| M-DCT \| Executive Package \| 19" Black 437M Wheels \| Carbon Fiber Trim \| Sunroof \| Active Blind Spot \| Heated Steering Wheel \| Adaptive M Suspension

05-29-2014, 11:35 AM	#12
Mr 286 Senior Member Join Date: Jun 2012 Drives: 2014 Camry SE V6 \| 1991 MR2 Turbo Location: Las Vegas, NV Posts: 107 Thanks: 42 Thanked 32 Times in 18 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	The hiss is definitely not normal. I had a similar sound occur about a month or two before the pilot bearing went out on my clutch (something I was told by a mechanic is quite common on Subarus). So, if you're hearing a sound like you've got a vacuum leak or hiss when you blip the throttle, it may be a sign that the clutch pilot bearing is about to go soon. Hissing will go away and come back intermittently. Then there will be a rattle when it does go. Keep an eye on this and don't just write it off as normal noise. If it isn't something you expect to hear, then it is never normal noise. Hopefully yours is not as severe an issue. __________________ 2014 Camry SE V6 \| 1991 MR2 Turbo

05-29-2014, 12:29 PM	#14
ZionsWrath Thanks Join Date: Apr 2013 Drives: BRZ Location: NY Posts: 4,163 Thanks: 5,989 Thanked 3,100 Times in 1,498 Posts Mentioned: 38 Post(s) Tagged: 3 Thread(s)	Video? I don't hear any "hiss". But my quiet may be your hiss, who knows... __________________

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05-29-2014, 01:02 AM	#2
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 29,892 Thanks: 28,825 Thanked 31,873 Times in 16,444 Posts Mentioned: 708 Post(s) Tagged: 2 Thread(s)	You may consider plugging up the sound generator tube at the firewall and see if you still hear the "hiss". My 71 year old ears can't hear "hiss" and a lot of other sounds anymore ..... so, I don't know if my car hisses or not .. humfrz

05-29-2014, 08:51 AM	#8
Wepeel Senior Member Join Date: May 2012 Drives: '13 BRZ Ltd Location: PA Posts: 458 Thanks: 265 Thanked 229 Times in 117 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Haven't tried plugging the sound tube, but it's audible from outside of the car and with the windows down.

05-29-2014, 11:03 AM	#10
continuecrushing Join Date: Mar 2013 Drives: 2013 Firestorm FRS Location: Lake Elsinore, CA Posts: 2,707 Thanks: 1,231 Thanked 2,144 Times in 1,003 Posts Mentioned: 73 Post(s) Tagged: 2 Thread(s)	I hear the hiss too...pretty sure its normal

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