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Author
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Topic: Loud air hiss from Intake
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Teddy Tiger
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Member # 2473
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posted
 
 
For the past couple weeks, I've been getting a louder than normal air hiss from my Intake. I've got a K&N Filter, but I took off the whole intake hose and still got the sound from just the upper plenum...any ideas? All of my hoses are okay. The engine idles rather high, too, like it's getting a little extra air from somewhere...
Nick
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2008 Mustang GT 'Premium'
Vista Blue Metallic
Interior Upgrade, Comfort Group
Charcoal Leather Interior
Shaker 500 Stereo
Posts: 167 | From: Lafayette, California | Registered: Feb 2003
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mike g
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Member # 2919
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posted
check for vacuum leaks...
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FOUR EYED PRIDE!!!!!!
Posts: 289 | Registered: Jun 2003
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KCmustangboy
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Member # 1927
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posted
quote:
Originally posted by mike g:
check for vacuum leaks...
what he said! ![[patriot]](graemlins/patriot.gif)
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03 Cobra... Factory long block, with Whipple and AED tune... 812rwhp 10.0s @ 140... almost there!
WWW.AEDHP.COM
Posts: 1691 | From: San Jose, CA | Registered: Oct 2002
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Teddy Tiger
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Member # 2473
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posted
quote:
Originally posted by Teddy Tiger:
All of my hoses are okay. The engine idles rather high, too, like it's getting a little extra air from somewhere...
Nick
Like I posted before, all of my vacuum hoses are okay. I even had a Ford tech take a listen and look, he verified the hoses are okay. Someone mentioned that the paper gaskets could get sucked in from the Upper plenum, or that the IAB motor could be sticking...
Nick
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2008 Mustang GT 'Premium'
Vista Blue Metallic
Interior Upgrade, Comfort Group
Charcoal Leather Interior
Shaker 500 Stereo
Posts: 167 | From: Lafayette, California | Registered: Feb 2003
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cobraman_1994
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Member # 467
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posted
did you accidently install a vortech supercharger instead of a K&N air filter?
Posts: 4882 | From: eldorado hills | Registered: Sep 2001
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Luke87GT
Lay'n more stripes
than Caltrans
Member # 21
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posted
Get a vacuum gauge and check what your vacuum is at idle. If it is erratic, you got a vacuum leak most likely. Track it down.
Luke
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Stangless
Posts: 7802 | From: San Mateo | Registered: Jul 2000
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wikdstang
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Member # 357
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posted
I have the same problem anyone know where i can get a vaccum diagram for a 2000 4.6?
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2000 GT
Eibach Sportlines,Steeda Caster/Camber plates,Steeda Tri-ax,BBK underdrive pullies,Mac Pro Chamber,JBA Shorty Headers, 2 Chamber flowmasters, K&N,Bilstein shocks and struts,Cobra brakes with cross drilled rotors,Cobra front Fascia and 2000 Cobra R Hood, Rims, And Wing
Posts: 28 | From: san diego, ca, us | Registered: Jul 2001
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Wildfire532FB
CAFords OG
Member # 1482
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posted
Where is the noise coming from on the intake? get a hose and put it up to your hear and try and track down the noise.
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17578 | From: 530 | Registered: Jun 2002
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Teddy Tiger
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Member # 2473
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posted
It sounds like it's *inside* the upper plenum...
What is weird is that when I let the clutch in, it idles very hight (1200 rpm) then after a few seconds will drop back down to 900rpm, almost like something might be sticking.
Nick
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2008 Mustang GT 'Premium'
Vista Blue Metallic
Interior Upgrade, Comfort Group
Charcoal Leather Interior
Shaker 500 Stereo
Posts: 167 | From: Lafayette, California | Registered: Feb 2003
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nitrousracing
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Member # 1346
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posted
I had the same problem with my 96 GT. It was coming from the upper plenum. It was the butterfly in the upper plenum that was not closing fully, it had some gunk on it. Try cleaning that. It went away for awhile then came back.
Also they are right could be a vacuum leak.
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1999 BMW 323is
Posts: 423 | From: chico CA | Registered: May 2002
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