some hissing

notsoslo5.0 · July 27th, 2006, 10:18 PM

it sounds like a hissing noise from my intake manifold near the firewall does anyone know wat it could be. its a stock intake manifold on a 92gt and it only does it when i rev it up in neutral, when i get on it in first gear, and when i downshift.......gaskets on the manifold maybe?

Bill · July 28th, 2006, 03:20 AM

possibally broken Vacuum line.

notsoslo5.0 · July 28th, 2006, 01:33 PM

can anyone tell me how i would check this? to see if it is indeed a broken vaccum line

YsOffcr · July 28th, 2006, 06:32 PM

Check the PCV valve. Make sure it's seated all the way.

dcraig8 · July 29th, 2006, 01:29 PM

put a vacuum gauge on any source and pump it up to 18-20 inches. close off the valve and watch your gauge. if it starts to bleed down then start inspecting all of your vacuum lines for brittleness, tears, and poor connections. replace as neccessary

320hpPony? · August 18th, 2006, 01:42 AM

Check for a cracked EGR line off of your cylinder head

July 27th, 2006, 10:18 PM	#1
notsoslo5.0 Regular Join Date: Jul 2006 Posts: 326 iTrader: 0 reviews	some hissing it sounds like a hissing noise from my intake manifold near the firewall does anyone know wat it could be. its a stock intake manifold on a 92gt and it only does it when i rev it up in neutral, when i get on it in first gear, and when i downshift.......gaskets on the manifold maybe?

July 28th, 2006, 03:20 AM	#2
Bill Hardcore Enthusiast Join Date: Aug 2005 Posts: 1,327 iTrader: 0 reviews	possibally broken Vacuum line. __________________ Too often, We lose sight of life's simple pleasures. Remember, when someone annoys you it takes 42 muscles in your face to frown, BUT, it only take 4 muscles to extend your arm and bitch-slap that Mother@#?!&! upside the head!!

July 28th, 2006, 01:33 PM	#3
notsoslo5.0 Regular Join Date: Jul 2006 Posts: 326 iTrader: 0 reviews	can anyone tell me how i would check this? to see if it is indeed a broken vaccum line __________________

July 28th, 2006, 06:32 PM	#4
YsOffcr Newbie Join Date: Jul 2006 Location: Chesapeake, VA Posts: 35 iTrader: 0 reviews	Check the PCV valve. Make sure it's seated all the way. __________________ check out my gotstang.com page

August 18th, 2006, 01:42 AM	#6
320hpPony? Regular Join Date: May 2006 Location: jacksonville,FL Posts: 188 iTrader: 0 reviews	Check for a cracked EGR line off of your cylinder head __________________ Yeah, its ugly, but hot damn its fast! Got 2 camaro SS's and 1 LT1 vette under mah belt in it!

July 29th, 2006, 01:29 PM	#5
dcraig8 Regular Join Date: Jun 2006 Location: san antonio texas Posts: 124 iTrader: 0 reviews	put a vacuum gauge on any source and pump it up to 18-20 inches. close off the valve and watch your gauge. if it starts to bleed down then start inspecting all of your vacuum lines for brittleness, tears, and poor connections. replace as neccessary

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