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Hissing noise when pushing on the gas

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Old 6/8/15, 09:12 PM
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Hissing noise when pushing on the gas

Hi guys. I am having a hissing noise when pushing on the gas. The noise although not very loud is annoying since my car shouldn't be doing it. Apparently it doesn't affect performance and the car drives fine. It is and automatic 2014 mustang gt. It had the transmission repaired like a month ago and started to make this noise since i got it back from the dealership. It never had any noise before. Any of you had this or similar issue before?
Old 6/8/15, 09:17 PM
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Originally Posted by slash28cu
Hi guys. I am having a hissing noise when pushing on the gas. The noise although not very loud is annoying since my car shouldn't be doing it. Apparently it doesn't affect performance and the car drives fine. It is and automatic 2014 mustang gt. It had the transmission repaired like a month ago and started to make this noise since i got it back from the dealership. It never had any noise before. Any of you had this or similar issue before?
The problem i have is that the noise is barely noticeable to somebody that is not used to my car , and it can be easily ignored or missed by an occasional driver. But i really know my car since i bought it brand new and has been my daily driver for almost a year. I can definitively hear the noose while cruising in the highway or any other moment where i have to push the gas. Is like torture because is almost brand new 12k car. I would be so pissed off if it was a 70+ thousand miles car. But it sucks to pay a new car to deal with this issues.
Old 6/9/15, 08:28 AM
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After you checked for the above, seriously I suggest taking it back to that dealership that did the work. They caused something. It shouldn't be making new noises after a repair.
Old 6/9/15, 08:51 AM
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sounds like a vacuum leak.
Old 6/9/15, 05:44 PM
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Originally Posted by slash28cu
I am having a hissing noise when pushing on the gas.
Normal. It's snake DNA in your Mustang. We all have a little bit of it, some Mustangs more than others.
Old 6/9/15, 06:48 PM
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Hissing noise when pushing on the gas

Originally Posted by NC07GTCS
Attachment 171944

After you checked for the above, seriously I suggest taking it back to that dealership that did the work. They caused something. It shouldn't be making new noises after a repair.
Is that the serpentine belt?
Old 6/11/15, 06:43 AM
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Hi guys, thank you all for all the advice. I took the car back to the dealership and demanded that my car is fixed correctly and returned to my satisfaction with no new noise. Thanks god was nothing major, it was a normal sound coming probably from the air intake and the mechanic working on my car found the grommet on the firewall , the one on the left of the break pedal was not correctly sealing and that caused all the noises go to the cabin. They also grab a used mustang identically to mine ( 2000 miles) that was for sale and intentionally remove the grommet and test drove it with me and i could confirm this noise is normal.

Thanks all again
Old 6/11/15, 02:32 PM
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I was going to guess tire spin... LOL


"When I step on the gas pedal, the **** car doesn't move, but the spedo reads 90mph - must be a calibration issue. What's all this smoke?"
Old 6/11/15, 05:47 PM
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Shelbys make that noise all the time!
Old 6/12/15, 08:09 AM
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Just put some Super Snake badges on the car and you will be all set
Old 6/12/15, 02:20 PM
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it came with shelby dna mixed in it
Old 6/13/15, 11:19 PM
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I'm also having a hissing noise, yesterday I was removing my outlaw axle backs to put my stock ones (going different route) and checked for any exhaust leaks everything is good. Don't know if this has something to do with it tho, but when I opened my hood I can hear like a hissing noise on the passenger side. I'm sure it's not normal, because I have never heard it before until right now.
Old 10/17/23, 01:29 PM
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Originally Posted by NC14GT
Attachment 171944

After you checked for the above, seriously I suggest taking it back to that dealership that did the work. They caused something. It shouldn't be making new noises after a repair.
Dave,

First Thought That Popped into My Head When I Saw the Old Thread!

And Working At Ford Dealerships in a Farming Community We Have Found Lots of Hitch Hikers over the Years! Birds, Cats, Raccoons & Mice Off the Top of My Head! Many Had Chewed Wiring & Disabled Car! Love the Soy Content in the Wiring! Oh and Some Farmers Would Bring Trucks in With Livestock in The Back! The Techs Loved Working on the Sheep Farmers Trucks on Interior Issues Where The Carpet Was Ohh So Not Sweet Smelling!

Kc
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