Noise when letting off the throttle

Bruggers · 04-07-2017, 12:42 PM

When I am in neutral and give it a little bit of gas then let off I hear a weird noise almost like a pressure release/hiss, is this normal or does anyone have some insight on what this could be? When I rev it up past 2 or 3k rpm it seems to go away a bit. When it was cold I first heard it and blamed it on the weather but last night I tried it again and got the same noise just not as dramatic.

I'll try and post a video of the noise later on.

Any insight will help, thanks in advance.

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Spooler · 04-07-2017, 12:55 PM

Do you have HFC's, test pipes, or long tube headers? If so, this is normal.

KngScottieV · 04-07-2017, 01:01 PM

Quote:

Originally Posted by Spooler

Do you have HFC's, test pipes, or long tube headers? If so, this is normal.

I have HFC's, it's really noticeable like from 3500 rpm down to 2500 rpm. Just normal for our engines OP. No worries!

Bruggers · 04-07-2017, 01:08 PM

No everything is stock, you guys feel it is normal still?

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BGTV8 · 04-07-2017, 05:44 PM

Quote:

Originally Posted by Bruggers

No everything is stock, you guys feel it is normal still?

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You have a loose OEM exhaust head shield - fixing it will be a PITA because the bolts are near impossible to get to

Bruggers · 04-07-2017, 06:50 PM

Thanks for the response, I tried to research and it looks like heat shield is sitting after the cats (If I'm seeing things right), the noise I have comes from the engine bay. Do you think the heat shield could cause a sound from the sound from the engine bay?

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Bruggers · 04-07-2017, 07:03 PM

I looked at the diagram for the heat shield again, I actually don't know it's exact location. Any help would be aporeciated.

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BGTV8 · 04-07-2017, 09:05 PM

Quote:

Originally Posted by Bruggers

Thanks for the response, I tried to research and it looks like heat shield is sitting after the cats (If I'm seeing things right), the noise I have comes from the engine bay. Do you think the heat shield could cause a sound from the sound from the engine bay?

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The heat shields are clamped onto the OEM headers upstream of the cats.

They are a B1tch to get to.

You need the car on a hoist and be looking underneath to get at the clamps that fix them to the OEM exhaust manifold

Bruggers · 04-18-2017, 11:10 AM

https://youtu.be/CncQEYeQt3A

I was finally able to get a short clip of video, you can hear the hiss/gasp noise after I let off the throttle. Still think it is the heat shield??

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lj909 · 04-18-2017, 01:21 PM

That's a natural sound for this engine. If you put hfc/test pipes, it'll be louder

ChaseZ · 04-18-2017, 01:55 PM

Doesn't sound like anything to worry about there.

Bruggers · 04-18-2017, 02:40 PM

Thank you guys, I just wanted to make sure it was a normal noise for this engine. Your help is much appreciated and calms my nerves a bit. Haha

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04-07-2017, 12:42 PM	#1 (permalink)
Bruggers Base Member Join Date: May 2016 Location: Illinois Posts: 20 Drives: 2012 Sport Touring 6 Rep Power: 9	Noise when letting off the throttle When I am in neutral and give it a little bit of gas then let off I hear a weird noise almost like a pressure release/hiss, is this normal or does anyone have some insight on what this could be? When I rev it up past 2 or 3k rpm it seems to go away a bit. When it was cold I first heard it and blamed it on the weather but last night I tried it again and got the same noise just not as dramatic. I'll try and post a video of the noise later on. Any insight will help, thanks in advance. Sent from my SM-G930T using Tapatalk Last edited by Bruggers; 04-07-2017 at 12:45 PM.

04-07-2017, 12:55 PM	#2 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,852 Drives: 2013 Nismo 370z Rep Power: 2684392	Do you have HFC's, test pipes, or long tube headers? If so, this is normal. KngScottieV and wideglideleon like this.

04-18-2017, 01:21 PM	#10 (permalink)
lj909 Track Member Join Date: May 2014 Location: Riverside Posts: 584 Drives: 40th 370Z Rep Power: 12	That's a natural sound for this engine. If you put hfc/test pipes, it'll be louder Chuck33079 likes this. __________________ PW 07 HR350Z R.I.P. Totaled by 82yr old woman 2010 40th Anniversary 370Z

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04-07-2017, 01:08 PM	#4 (permalink)
Bruggers Base Member Join Date: May 2016 Location: Illinois Posts: 20 Drives: 2012 Sport Touring 6 Rep Power: 9	No everything is stock, you guys feel it is normal still? Sent from my SM-G930T using Tapatalk

04-07-2017, 06:50 PM	#6 (permalink)
Bruggers Base Member Join Date: May 2016 Location: Illinois Posts: 20 Drives: 2012 Sport Touring 6 Rep Power: 9	Thanks for the response, I tried to research and it looks like heat shield is sitting after the cats (If I'm seeing things right), the noise I have comes from the engine bay. Do you think the heat shield could cause a sound from the sound from the engine bay? Sent from my SM-G930T using Tapatalk

04-07-2017, 07:03 PM	#7 (permalink)
Bruggers Base Member Join Date: May 2016 Location: Illinois Posts: 20 Drives: 2012 Sport Touring 6 Rep Power: 9	I looked at the diagram for the heat shield again, I actually don't know it's exact location. Any help would be aporeciated. Sent from my SM-G930T using Tapatalk

04-18-2017, 11:10 AM	#9 (permalink)
Bruggers Base Member Join Date: May 2016 Location: Illinois Posts: 20 Drives: 2012 Sport Touring 6 Rep Power: 9	https://youtu.be/CncQEYeQt3A I was finally able to get a short clip of video, you can hear the hiss/gasp noise after I let off the throttle. Still think it is the heat shield?? Sent from my SM-G930T using Tapatalk

04-18-2017, 01:55 PM	#11 (permalink)
ChaseZ A True Z Fanatic Join Date: May 2016 Location: Calgary Posts: 3,799 Drives: 16 370z Rep Power: 94683	Doesn't sound like anything to worry about there.

04-18-2017, 02:40 PM	#12 (permalink)
Bruggers Base Member Join Date: May 2016 Location: Illinois Posts: 20 Drives: 2012 Sport Touring 6 Rep Power: 9	Thank you guys, I just wanted to make sure it was a normal noise for this engine. Your help is much appreciated and calms my nerves a bit. Haha Sent from my SM-G930T using Tapatalk