Valley intake gaskets
Thread Starter
Team Owner
Joined: Oct 2004
Posts: 81,241
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From: altered state
St. Jude Donor '05
Valley intake gaskets
2002 5.3 guessing LS1 is similar
If this seal is compromised does it do more than just leak?
Does the intake pull vaccum through this area?
Trying to pinpoint a vacuum leak thats escaping me.
Intake full of oil, pretty wet. Not sure if thats relevant
If this seal is compromised does it do more than just leak?
Does the intake pull vaccum through this area?
Trying to pinpoint a vacuum leak thats escaping me.
Intake full of oil, pretty wet. Not sure if thats relevant
Le Mans Master
Joined: Mar 2002
Posts: 5,955
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From: PNW
Are you talking about the intake manifold, or the valley cover. They are two separate pieces with their own gaskets.
The intake is under vacuum like any other intake manifold due to the vacuum caused in the cylinders during an intake stroke.
Excessive oil in the intake manifold is caused by too much oil making it's way from the PCV system. It could be the baffle on the inside of the valley cover has a bad seal. There was a TSB about that long ago. Other things can cause excessive oil in the intake manifold too.
The intake is under vacuum like any other intake manifold due to the vacuum caused in the cylinders during an intake stroke.
Excessive oil in the intake manifold is caused by too much oil making it's way from the PCV system. It could be the baffle on the inside of the valley cover has a bad seal. There was a TSB about that long ago. Other things can cause excessive oil in the intake manifold too.
Last edited by ZeeOSix; Apr 12, 2014 at 04:36 PM.
Racer
Joined: Apr 2010
Posts: 266
Likes: 10
From: Noble OK
The truck engines don't have the PCV in the valley cover like the LS6. They go through the traditional route in the valve cover. That is most likely the source of the oil.
What leads you to believe you have a vac leak?
What leads you to believe you have a vac leak?
Thread Starter
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
I just see a tube going in the DS valve cover no pcv? have to look harder
Truck had a slight misfire at idle, very low power pinging real bad. Exh pulse was super weak
Thought it was acats so I replaced them
Though they did need replacing soon cats werent the issue
Put the green fel pros on the intake along with 2 knock sensors new GM harness TB gasket etc.
Runs way better just not 100% I think.
When you crack the throttle blade I get a sssshhh noise. LIke air sucking . Used a can of carb cleaner everywhere on the intake/system cant detect a leak
This PCV/sucking oil thing has me interested
Bout a month ago it used a few quarts in 1 weeks time. Then returned to normal. ??????
Truck had a slight misfire at idle, very low power pinging real bad. Exh pulse was super weak
Thought it was acats so I replaced them
Though they did need replacing soon cats werent the issue
Put the green fel pros on the intake along with 2 knock sensors new GM harness TB gasket etc.
Runs way better just not 100% I think.
When you crack the throttle blade I get a sssshhh noise. LIke air sucking . Used a can of carb cleaner everywhere on the intake/system cant detect a leak
This PCV/sucking oil thing has me interested
Bout a month ago it used a few quarts in 1 weeks time. Then returned to normal. ??????
Last edited by cv67; Apr 12, 2014 at 11:10 PM.
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
There should be hose coming of the intake manifold someplace close to the throttle body on the vacuum side of the blade. That hose either runs to one or both valve covers or a nipple on the valley cover. Not sure since this sounds like a truck engine.
Thread Starter
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
There is one fitting that runs from the TB to the PS valve cover, another runs from top of manifold to right rear on DS valve cover. Ill ck the PS valve cover
Still fighting the dreaded p0332 code also. Replaced knock sensors harness all gaskets.
Ill replace all the 02s also today never touched them in 12 yrs.
Still fighting the dreaded p0332 code also. Replaced knock sensors harness all gaskets.
Ill replace all the 02s also today never touched them in 12 yrs.
