Oil in intake
Thread Starter
Burning Brakes
Joined: Oct 2011
Posts: 956
Likes: 36
From: Norwalk CT
Oil in intake
Ok,
I know this is a common problem and searched threads for some answers .
I have LS6 with catch can pulled off TB to clean and puddle of oil sitting inside intake ?
Cleaned it out drove a few miles more oil in intake ?
Car runs fine no puffs of oil spark plugs are clean What gives ?
I do have after market Valve covers but all PVC line are hooked up and working .
Should I be worried about this ?
I know this is a common problem and searched threads for some answers .
I have LS6 with catch can pulled off TB to clean and puddle of oil sitting inside intake ?
Cleaned it out drove a few miles more oil in intake ?
Car runs fine no puffs of oil spark plugs are clean What gives ?
I do have after market Valve covers but all PVC line are hooked up and working .
Should I be worried about this ?
Acct Suspended APR 2026 by request
Joined: Dec 2010
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2020 Corvette of the Year Finalist (performance mods)
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what kind of catch can do you have?... some of them are not designed properly and are really no more than an empty can and can easily allow oil to pass right through and back into your intake
Drifting
Joined: Jul 2005
Posts: 1,484
Likes: 27
From: Torrance Calif
Get a "real" catch can that can hold some volume and has a screen or barrier inside.
Check to make sure your plumbing it right.
Sound like you have the vacuum hooked up right because you are sucking oil.
I use this one, and it solved my problem.
http://www.ebay.com/itm/270490067270...84.m1423.l2649
I "Y" connected the two valve covers to the catch can input.
Check to make sure your plumbing it right.
Sound like you have the vacuum hooked up right because you are sucking oil.
I use this one, and it solved my problem.
http://www.ebay.com/itm/270490067270...84.m1423.l2649
I "Y" connected the two valve covers to the catch can input.
Thread Starter
Burning Brakes
Joined: Oct 2011
Posts: 956
Likes: 36
From: Norwalk CT
That is the can I have . My friend with a Ls3 has same one works great .i made sure it was connected correct . But I dont have the valve cover vents Y off to the can .
My pass side valve cover vent is connected to top of TB on right side ?
My pass side valve cover vent is connected to top of TB on right side ?
Drifting
Joined: Jul 2005
Posts: 1,484
Likes: 27
From: Torrance Calif
You need to "Y" then together or run two catch cans.
Thread Starter
Burning Brakes
Joined: Oct 2011
Posts: 956
Likes: 36
From: Norwalk CT
I have the Proform valve covers
http://forums.corvetteforum.com/c5-t...post1587088509
So you telling me I need to plug the vac inlet on the top right of TB and route to line from the pass side Valve cover to inlet of Catch can ?
http://forums.corvetteforum.com/c5-t...post1587088509
So you telling me I need to plug the vac inlet on the top right of TB and route to line from the pass side Valve cover to inlet of Catch can ?
Instructor
Joined: May 2014
Posts: 148
Likes: 2
From: Orlando, FL
I was thinking the PCV, but is it before or after the catch can? The reason I ask is, the blow-by that occurs may still by causing some oil from the catch can to cycle into the intake. Also, is do you have any codes where the throttle position sensor can be off? I am thinking of an issue where a positive pressure is being built and forcing a blow back into the intake...
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Drifting
Joined: Jul 2005
Posts: 1,484
Likes: 27
From: Torrance Calif
I have the Proform valve covers
http://forums.corvetteforum.com/c5-t...post1587088509
So you telling me I need to plug the vac inlet on the top right of TB and route to line from the pass side Valve cover to inlet of Catch can ?
http://forums.corvetteforum.com/c5-t...post1587088509
So you telling me I need to plug the vac inlet on the top right of TB and route to line from the pass side Valve cover to inlet of Catch can ?
Obviously you are only running one side into the catch presently.
Safety Car
Joined: Aug 2011
Posts: 4,451
Likes: 410
From: Portland OR
Factory valve covers have baffles inside them that help to keep oil away from the hose connections.
Without the baffles, oil has a direct shot at the hose.
Your link to the covers brought up this thread.....
Aftermarket covers often times have no baffles......so you should check for that
Ron
Without the baffles, oil has a direct shot at the hose.
Your link to the covers brought up this thread.....
Aftermarket covers often times have no baffles......so you should check for that
Ron
Thread Starter
Burning Brakes
Joined: Oct 2011
Posts: 956
Likes: 36
From: Norwalk CT
re Oil in Intake
There is no other line coming from VC but the fresh air line from top right side of TB . I checked my OEM VC's same thing , the drives side cover has NO line coming off of it . I have line from Vally cover running to Catch Can out Catch can to TB thats it there is no other lines to "Y" to Catch Can ? I did read that on 2004 LS6 and up GM has a up dated Valley Cover with internal PVC ?
Attached is my set up .
ps, the after market VC have baffles
Attached is my set up .
ps, the after market VC have baffles
Factory valve covers have baffles inside them that help to keep oil away from the hose connections.
Without the baffles, oil has a direct shot at the hose.
Your link to the covers brought up this thread.....
Aftermarket covers often times have no baffles......so you should check for that
Ron
Without the baffles, oil has a direct shot at the hose.
Your link to the covers brought up this thread.....
Aftermarket covers often times have no baffles......so you should check for that
Ron
Drifting
Joined: Jul 2005
Posts: 1,484
Likes: 27
From: Torrance Calif
Both LS6'S in my Vette and CTS-V have a vent pipe in the valve cover, and not from the valley cover.
You might try reversing your connections to the catch can.
The way you have it, if trapped oil sloshes, it will be sucked from the side.
Also, you are using a "high" vacuum tap.
You might try using the one on the TB.
You might try reversing your connections to the catch can.
The way you have it, if trapped oil sloshes, it will be sucked from the side.
Also, you are using a "high" vacuum tap.
You might try using the one on the TB.