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11-06-2004, 09:25 AM | #1 |
Registered Member
Join Date: Nov 2004
Location: New Jersy
Posts: 7
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intake leak
Recently i started hearing a high pitched squeaking noise from under the hood of my 1987 5.0 it sounded like a leaking intake manifold gasket. so i changed both the upper and lower gaskets. It still does it. when i shut the engine off you can definitly hear air leaking from something. anyone any ideas?
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11-08-2004, 11:41 AM | #2 |
Rearview Mirror Haze
Join Date: May 1999
Location: Huntsville, Alabama...a.k.a. "HuntsVegas"
Posts: 387
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Re: intake leak
A cold air intake, or modified airbox will make that sound when you turn the car off... just a suggestion. Otherwise take it to the local guy and have it pressure tested. Heck, for that matter, I don't see why ya couldn't take some soapy water in a spray bottle and give it a couple of passes around the gasket. It shouldn't be any different than checking a tire. Just steer clear of the battery and distributor. If it bubbles in a certain place, its leaking. Anybody else had that problem?
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93 lx Notch 01 GT ...the epitome of Murphy's Law |
11-08-2004, 01:34 PM | #3 |
Registered Member
Join Date: Nov 2004
Location: New Jersy
Posts: 7
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Re: intake leak
thanks, i do have a cold air intake and a march ram air box and i just put a bbk 70mm throttle body on. after installing the throttle body i started to notice the sound. if i put my ear up to the raer of my 93 cobra intake thats where i hear the noise comming from. i replaced all the vacuum lines and intake gasket. still making the sound.
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11-08-2004, 04:58 PM | #4 |
I'm slow ...I know.
Join Date: Dec 2003
Location: houston
Posts: 518
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Re: intake leak
i think we have our answer if you notice the sound after installing the tbody...?
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11-08-2004, 09:48 PM | #5 | |
Mizzou Tigers
Join Date: Apr 1999
Location: weston, MO United States
Posts: 1,455
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Re: intake leak
Quote:
Yup, especially when you said BBK. I had the same Tbody on my car and at times it whistled so much you would think I had a blower on it. If the sound just started when you put on the BBK, I would say that is where it is coming from. It is normal for those to whistle, so nothing to worry about.
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2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244 |
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11-09-2004, 01:52 PM | #6 |
Registered Member
Join Date: Nov 2004
Location: New Jersy
Posts: 7
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Re: intake leak
thanks guys! I put the old throttle body back on and the whistle stopped. so i will just deal with the whistle.
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11-09-2004, 08:39 PM | #7 |
Factoy Five Roadster
Join Date: May 2000
Location: Sevier Co,Tennessee
Posts: 1,681
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Re: intake leak
Turbulence in the airflow stream can create a whistle. This can be created by sharp edges in the air intake system, most notably when a larger throttle body is used on a stock intake that has not been 'Port Matched.' The air along the outer edges of the air intake system and throttle body hits the "wall" of the smaller intake manifold, creating turbulence that can cause a noticeable whistle. Other trouble areas can be the small vacuum ports and the IAC (Idle Air Control) valve port which may empty into the main bore of the throttle body. If these edges are square enough at the entry point of the bore, it
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Frank |
11-11-2004, 01:23 PM | #8 |
Registered Member
Join Date: Nov 2004
Location: New Jersy
Posts: 7
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Re: intake leak
i have a cobra intake wich has a 7omm intlet. the throttle body is also 70mm. i check the iac and for any sharp edges. as far as i can tell there is nothing that should be causing problems with the air flow. i notice that the wistle is only heard at idle when the cars is warmed up.
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