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Camaro V6 LFX Engine, Exhaust, and Bolt-Ons For all LFX related parts

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Old 08-05-2013, 09:28 AM   #1
NJ-JRS
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Oil in throttle body and intake tube

Hi Guys,

Considering I have an RX catch can, what would cause oil buildup in my intake tubing and throttle body?

I swapped out throttle body's this weekend for a ported one (which I've noticed ZERO improvement with in terms of the dead spot and throttle response, but that's a whole other issue to deal with), and during the process I found somewhat-dirty oil in the oil body and intake tubing that I had to wipe down with a paper towel. I had gotten the catch can at pre-1000 miles before I even had the intake, but they're not directly in sequence with each other anyway so I'm not sure if that matters.

Is some oil buildup around there just natural, or could there be an issue that I need to insect?

Thanks!
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Old 08-05-2013, 09:35 AM   #2
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Is it hooked up correctly?
Have you drained your catch can?
Have you done a top end cleaning to get the pre-1000 miles gunk out?
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Old 08-05-2013, 10:09 AM   #3
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You have a 2 oil lines to the intake, dirty(from the pcv to the intake manifold) and another (clean side) that's supposed to be negative pressure from driver side valve cover to intake tube. I was wondering if a second catch can is required...?
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Old 08-05-2013, 01:09 PM   #4
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I have drained the catch can many times, but have not done any cleanings.

Though I can say it seems the oil is coming from the pipe that is fed directly into the intake tubing to the left of the tube connector piece (RotoFab setup if that helps). Does that help narrow down if there's something in particular I need to fix?

Here's an old pic from when I installed if that helps anyway unfamiliar with how the roto fab is set up.
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Old 08-05-2013, 01:11 PM   #5
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Actually I have used Tectron's fuel system cleaner once or twice if that's what you were referring to.
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Old 08-05-2013, 01:17 PM   #6
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More than likely the Oil is coming from the Clean side which is the tube that runs from the rear driver side valve cover to the intake. You could place another catch can on there but there are other options. You could install a breather and cap off both ends or you could do something like the 1LE separator.

I myself will be doing the 1LE separator which should be coming in this week (was told it will ship today). That i know of i will be the first V6 on the forum to install it so I guess we will see how it works out.
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Old 08-05-2013, 05:10 PM   #7
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Correct me if I am wrong, but you said you installed the catch can before the cold air intake right? If you did, you may have installed it wrong. In the picture you posted the line I circled should be cut and hooked to the catch can. You may want to check this out
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Old 08-05-2013, 05:34 PM   #8
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This line that I colored red is where the oil is coming from. It is your breather. The fastest way to fix it is to get a oil breather cap and seal off that line.



I just did this and now no more oil in my intake.

I have had my car for a few months and I found this when taking the oil breather line off of my intake.

You can see the oil in this image:
http://i714.photobucket.com/albums/w...ps62b162c6.jpg

New breather cap:


I will note... this breather cap seemed to have some sort of pressure valve on it that caused my cap to make sucking noises. I ripped the pressure valve off the bottom of the new oil cap filter and it works like a champ.

Final layout
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Old 08-05-2013, 05:42 PM   #9
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The breather cap will help with the RX catch can, but I stand by my last post if he installed the catch can before the intake. The picture shows the intake installed and the line that should be coming from the catch can to the intake that should be cut and run to the can, it clearly is not.
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Old 08-05-2013, 05:44 PM   #10
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Quote:
Originally Posted by Buschman View Post
The breather cap will help with the RX catch can, but I stand by my last post if he installed the catch can before the intake. The picture shows the intake installed and the line that should be coming from the catch can to the intake that should be cut and run to the can, it clearly is not.
I agree with that point.

Can we see an image of your catch can install?

The RX Catch Can install should look something like this.

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Old 08-05-2013, 07:24 PM   #11
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Hi guys,

Its installed the correct way according to your pics and instructions. I'll take a pic later when I'm home to post and confirm.

But the oil seems to in fact be coming from the line sledgehammer highlighted above with the red line/arroe
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Old 05-16-2014, 03:57 PM   #12
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Hi Guys,

Hate to resurrect this old thread but I'm still having the issue of the clean line from my picture above (the one running vertical next to the oil cap) leaking oil into the intake tubing. My catch can is installed correctly as per the RX instructions, but from a few things I've heard some people have had this problem with this line leaking oil.

Does anyone know of a solution for this?

Thanks!
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Old 05-16-2014, 04:03 PM   #13
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Sounds like you are referring to the clean side.

For that you need a 1LE separator or Elite makes a separator now. I wrote a 1LE separator install DIY for the LFX. Find it and have a look.
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Old 05-16-2014, 04:45 PM   #14
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^^^^ This.
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Old 05-16-2014, 04:54 PM   #15
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Wow good to see they finally made something for this issue.

I see both Elite's and RX's products online. Anyone have a preference as to which one to go with? Any issues closing the hood with either?

Also can someone explain if I'm missing something; I'm not sure where the clean tube comes from, but obvi it's coming from somewhere into the intake tubing. These 'oil seperator' caps I'm seeing seem to have one valve side on them; I would think it needs one on each end to act as a 'pass-through' device in this line for the vapors just like the normal catch cans on the dirty side. Can someone explain to a layman what I'm missing about this?
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Old 05-16-2014, 05:01 PM   #16
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A little bit off oil is going to come through there especially if you have a heavy right foot. It's not good but it isn't indicative of a serious engine problem (not likely at least). During normal driving the air restriction of the throttle body plate creates a difference in pressure between the clean side and the dirty side. Air flows in the clean side, through the crankcase, and out the dirty side. At wide open throttle there is significantly less differential pressure between the intake manifold and the intake tubing because the throttle plate is restricting much less air flow. Thus, small amounts of oil are able to make their way through the clean side tubing and into the intake tubing and throttle body.

Because it was designed as a track ready car the 1LE has an oil separator that prevents this as the car is expected to spend some time in WOT conditions.

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Old 05-16-2014, 05:05 PM   #17
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Have you noticed a difference with the ported throttle body, or still nothing? I love mine I could feel a difference right away.
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Old 05-16-2014, 05:08 PM   #18
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Quote:
Originally Posted by 6bangerBOOM View Post
A little bit off oil is going to come through there especially if you have a heavy right foot. It's not good but it isn't indicative of a serious engine problem (not likely at least). During normal driving the air restriction of the throttle body plate creates a difference in pressure between the clean side and the dirty side. Air flows in the clean side, through the crankcase, and out the dirty side. At wide open throttle there is significantly less differential pressure between the intake manifold and the intake tubing because the throttle plate is restricting much less air flow. Thus, small amounts of oil are able to make their way through the clean side tubing and into the manifold.

Because it was designed as a track ready car the 1LE has an oil separator that prevents this as the car is expected to spend some time in WOT conditions.
Great explanation! Couldn't have said it better.
O.P., like others have said you'll want to look into the clean side separator or a second catch can. Personally, I prefer a dual catch can setup.

Feel free to call, PM or email me anytime with questions.

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Old 05-16-2014, 05:11 PM   #19
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The PCV system works like this:

Intake manifold vacuum draws air from the crankcase via the dirty side tube. Normally this pulls all the combustion byproducts and oil vapors out of the crankcase (and is supposed to burn them via combustion) , and prevents excessive pressure buildup. The catch can separates these byproducts out for draining instead of allowing them back into the intake, where they can coke up the valves.

To prevent creating a vacuum in the crankcase, there is an intake tube on the clean side. It pulls air from the intake tube, after the MAF sensor -- important, as eventually this air still ends up in the combustion chamber and needs to be accounted for by the ECM. This design allows for a "flow through" system, with no excessive pressure or vacuum in the crankcase.

Under some circumstances (WOT, forced induction, etc) intake manifold vacuum drops or disappears. Under those conditions, air (and oil, etc) can flow back down the clean side tube and be drawn into the intake tube and on to the throttle body. The separators (not catch cans) are designed to capture this backflow and allow it to drain back into the valve cover after the vacuum returns to normal. The separator allows air through the tube from the intake tube and also out its bottom, into the valve cover.

Hope that helps.
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Old 05-16-2014, 05:11 PM   #20
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Have you noticed a difference with the ported throttle body, or still nothing? I love mine I could feel a difference right away.
Still nothing unfortunately. I'm almost wondering if there's been underlying issues at hand from day one with my car since I don't notice a lot of the changes people have spoke about with these upgrades. Once I put CAI one, the only thing I noticed was less response/a delay on acceleration when I'd hit the gas; even added the apex scoop didn't change the way it felt. :(
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Old 05-16-2014, 05:24 PM   #21
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Quote:
Originally Posted by 6bangerBOOM View Post
A little bit off oil is going to come through there especially if you have a heavy right foot. It's not good but it isn't indicative of a serious engine problem (not likely at least). During normal driving the air restriction of the throttle body plate creates a difference in pressure between the clean side and the dirty side. Air flows in the clean side, through the crankcase, and out the dirty side. At wide open throttle there is significantly less differential pressure between the intake manifold and the intake tubing because the throttle plate is restricting much less air flow. Thus, small amounts of oil are able to make their way through the clean side tubing and into the manifold.

Because it was designed as a track ready car the 1LE has an oil separator that prevents this as the car is expected to spend some time in WOT conditions.
Nice explanation. My typing skills on my phone are too slow (and my post was too long).
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Old 05-16-2014, 06:02 PM   #22
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Hey guys,

Thanks for all the extra details, but to clarify the thing I'm confused about; since there's a hose running into the intake tube from the top area of the pic, I would think this new separator would be put into the middle of this line (green drawing, green circle being the separator).

From what I see though, unless Im not seeing it correctly, it replaces the oil cap and runs just one line to the intake tube (yellow in image), no? Does this mean the northern part of the original hose is now of no use and is just an open exposed hole (the area circled red) after the separator is installed?
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Old 05-16-2014, 06:08 PM   #23
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can you post a pic of your catch can install?
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Old 05-16-2014, 06:38 PM   #24
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The hose you are referring to is the clean side. This to me is GM's idea of getting all pollutants. This is where your oil is coming from. I have the same problem. The easiest explanation is the air box is creating a bigger vacuum and is overcoming the dirty side that is hooked to the top of the manifold and pulling the vapor into the intake tube and into you TB. I don't see how it does it but it does. The old days you had a PCV valve in the valve cover on one side and a breather cap on the other.
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Old 05-16-2014, 06:44 PM   #25
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Originally Posted by NJ-JRS View Post
Hey guys,

Thanks for all the extra details, but to clarify the thing I'm confused about; since there's a hose running into the intake tube from the top area of the pic, I would think this new separator would be put into the middle of this line (green drawing, green circle being the separator).

From what I see though, unless Im not seeing it correctly, it replaces the oil cap and runs just one line to the intake tube (yellow in image), no? Does this mean the northern part of the original hose is now of no use and is just an open exposed hole (the area circled red) after the separator is installed?
The separator air line plugs into the intake air tube (like the line you hi-lighted) and it's body replaces the oil cap. The other end of the line you hi-lighted is capped in a separator install. Basically you pull that line you hi-lighted out. There is a junction piece on the far end that when pulled GENTLY will pop out of the valve cover. DO NOT LOSE THIS PIECE! Measure the diameter of the end that plugged into the line you removed. Go to Auto Zone (or equivalent) and buy a small heavy duty rubber cap and a small clamp (they come in sets). Cap the piece on the rear of the valve cover. This information pertains to the factory 1LE separator. You can't use the cap that comes with it as it is too small for the LFX engine piece you are capping. This info is in my 1LE separator install DIY I referenced earlier.

http://www.camaro5.com/forums/showthread.php?t=314149

If you get the new Elite separator for the LFX it may come with everything you need. I haven't seen one so I don't know.

As to your throttle body response...

If you had more than a few thousand miles on the engine before you installed the catch can then you have a dirty intake manifold and valves. Preventing this buildup is why you bought the catch can. Buying the can didn't clean what was already in there though. If you notice a bit of a rough idle or delayed acceleration then your intake system is most likely dirty. Did the manifold feel oily when you installed the throttle body? To fix that there is another DIY I wrote for cleaning the LFX intake and valves.

http://www.camaro5.com/forums/showthread.php?t=288997

IMHO unless you have a very clean intake tract, a ported throttle body is useless.

Performing all this work is worth it though. The LFX is a sweet motor when it can breath! A good catch can and clean side separator will really help keep it clean and breathing well. I did all this work several thousand miles ago. It still runs great.
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