5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

air/hissing sound under hood

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Old 03-05-2008, 08:55 PM
  #1  
damagd
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Default air/hissing sound under hood

The other day I was driving around a bit and when I got home I could hear a loud air/hissing sound from under the hood. It seemed to be coming from the area right in front of the drivers side windshield in the engine area. Today when I started my car I could hear it right away. It's pretty loud and noticeable. There hasn't been any smoke and the car seems to be driving fine. Any ideas/suggestions. Thanks
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Old 03-05-2008, 09:02 PM
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mjr46
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Default RE: air/hissing sound under hood

check for a vaccum leak..use your ear to narrow down source
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Old 03-05-2008, 09:03 PM
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jperz89lx
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Default RE: air/hissing sound under hood

it could be a vaccum leak, get yourself some carb cleaner and with the engine running spray some of the cleaner where you think its coming from, and if the engine bogs a little you've got yourself a leak...be careful not to blow yourself up! haha[sm=lol.gif] just kidding man, its easy stuff
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Old 03-05-2008, 09:29 PM
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94StinkinLincoln
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Default RE: air/hissing sound under hood

the vaccume T is right there...
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Old 03-05-2008, 09:34 PM
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AllStockPony
 
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Default RE: air/hissing sound under hood

ORIGINAL: 94StinkinLincoln

the vaccume T is right there...
+1
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Old 03-05-2008, 11:51 PM
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damagd
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Default RE: air/hissing sound under hood

Thanks, I'll check it out. Is it going to be bad to drive it like that for a little?
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Old 03-06-2008, 01:25 AM
  #7  
PJC Racing
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Default RE: air/hissing sound under hood

Brakes feal any different?
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Old 03-06-2008, 01:47 AM
  #8  
nyfreakinrican7
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Default RE: air/hissing sound under hood

Check the vacuum lines under the upper intake manifold.
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