Hissing noise near the Throttle Body and Front Intake Manifold

[Party Rock]

For those who have a 2015-2020 Mustang GT, has anyone ever noticed a light "hissing" noise coming from the front of the Intake Manifold and Throttle Body when the engine is idle? Is this normal?

I popped my hood open with the engine on and just noticed the hissing today. I've only popped my hood a couple times with the engine on ever since I removed the plastic engine cover. I'm not sure if the plastic engine cover was covering up the noise back when I had it on. I don't remember my Mustang having this sound, however I did not really pay attention until now.

Here is a video of the sound. It's kind of hard to identify the noise through video so you have to listen closely, but it's noticeable in person.

Before the "it's a Shelby" comments appear...no, it's not a Shelby!

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[mustangpegasus51]

Check your build date. If it was between 9/10 and 9/19 2018 you may be in line for a new throttle body: https://static.nhtsa.gov/odi/tsbs/2019/MC-10153983-9999.pdf

EDIT: I think I read your post to late at night; I thought you mentioned throttle body clicking. Listening to the video this morning I agree with @Elp_jc your engine sounds smooth as butter tbh. Many owners on here would be jealous. XD

However I do still suggest at least knowing your build date just in case. If your TB was going bad or you had a bad vacuum leak you'd likely notice driveability issues.

 

[Elp_jc]

Can't hear anything wrong with that engine; at least from that recording. It actually sounds quite good, and no tick . My Bullitt doesn't have an engine cover, so that's a good car to compare your engine to.

 

[Party Rock]

Check your build date. If it was between 9/10 and 9/19 2018 you may be in line for a new throttle body: https://static.nhtsa.gov/odi/tsbs/2019/MC-10153983-9999.pdf

EDIT: I think I read your post to late at night; I thought you mentioned throttle body clicking. Listening to the video this morning I agree with @Elp_jc your engine sounds smooth as butter tbh. Many owners on here would be jealous. XD

However I do still suggest at least knowing your build date just in case. If your TB was going bad or you had a bad vacuum leak you'd likely notice driveability issues.

Thank you for the link. I looked at my build date and it is November 2018. No check engine lights.

 

[damondewaynehuff84]

Check your build date. If it was between 9/10 and 9/19 2018 you may be in line for a new throttle body: https://static.nhtsa.gov/odi/tsbs/2019/MC-10153983-9999.pdf

EDIT: I think I read your post to late at night; I thought you mentioned throttle body clicking. Listening to the video this morning I agree with @Elp_jc your engine sounds smooth as butter tbh. Many owners on here would be jealous. XD

However I do still suggest at least knowing your build date just in case. If your TB was going bad or you had a bad vacuum leak you'd likely notice driveability issues.

Hell my car is a 17 gt and the throttle body has been clicking loud enough to hear it without even popping the hood! Its been that way for over a year. I think its whats causing my issues now though so im gonna look into getting it replaced with a new one

 

[Kong76]

Yes my 16 does it same area. Thought maybe a cracked manifold as they are plastic. Looked everywhere for a leak. Tried butane gas and no changes. Been this way for a long time.

 

[njweatherman]

I have a 2020 mustang gt, California edition, automatic, and I have the same hissing noise from the engine bay. It sounds like an air leak. 3500 miles.

 

[Dozolol]

I’m having the same noise same area. Did we all decide this was normal? Or did anyone get a new throttle body?

 

[oneheadlite]

For those who have a 2015-2020 Mustang GT, has anyone ever noticed a light "hissing" noise coming from the front of the Intake Manifold and Throttle Body when the engine is idle? Is this normal?

I popped my hood open with the engine on and just noticed the hissing today. I've only popped my hood a couple times with the engine on ever since I removed the plastic engine cover. I'm not sure if the plastic engine cover was covering up the noise back when I had it on. I don't remember my Mustang having this sound, however I did not really pay attention until now.

Here is a video of the sound. It's kind of hard to identify the noise through video so you have to listen closely, but it's noticeable in person.

Before the "it's a Shelby" comments appear...no, it's not a Shelby!

A hissing noise, huh?
...isn't a Shelby Cobra by chance?????

 

[oneheadlite]

...sorry.

Couldn't resist..........................

 

[Dozolol]

Came back due to notifications saying someone replied to the thread. Wasn’t disappointed. Still interested in what the noise might be.

 

[Torino500]

My '20 GT hisses for the first minute or two after a cold start then it goes away. My '96 F150 5.8L did the same thing. The hiss was coming from the IAC valve next to the throttle body.

 

[glockholiday]

"at your own risk" the old school trick is to spray starting fluid or brake cleaner (something flammable) around the area you think there might be a vacuum leak. If there is a vacuum leak it will get sucked in and make the car rev up or stumble. If no vacuum leak then you're just hearing air flow turbulence from somewhere

 

[Albertcado]

For those who have a 2015-2020 Mustang GT, has anyone ever noticed a light "hissing" noise coming from the front of the Intake Manifold and Throttle Body when the engine is idle? Is this normal?

I popped my hood open with the engine on and just noticed the hissing today. I've only popped my hood a couple times with the engine on ever since I removed the plastic engine cover. I'm not sure if the plastic engine cover was covering up the noise back when I had it on. I don't remember my Mustang having this sound, however I did not really pay attention until now.

Here is a video of the sound. It's kind of hard to identify the noise through video so you have to listen closely, but it's noticeable in person.

Before the "it's a Shelby" comments appear...no, it's not a Shelby!

Did you ever figure this out? I have the same hissing on my 2020.

 

[njweatherman]

Did you ever figure this out? I have the same hissing on my 2020.

Yes, sorry for the late post. When I brought my car into the dealership for the first service, they said it was a normal noise coming from the AC compressor.

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