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Old 01-15-2015, 11:47 PM   #1
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Oil in Air Intake/Plenun

So about a month ago, I installed an SR CAI as well as a Trickflow Plenum.

Last week I was pulling stuff apart to install a new throttle body and I noticed oil in the air intake tube and all in the plenum and on the back of the stock throttle body. Ive never had this problem until I installed the CAI.

I read some threads, and apparently its coming from the PCV valve/ valve cover?

Anyways, I need suggestions on how to stop this from happening. I really don't want oil in my air intake. Thanks
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Old 01-16-2015, 09:25 AM   #2
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It's not going to hurt anything and is part of the normal operation of the engine. Unless it's a very large amount such as when you pull your CAI off and it dribbles out freely. Other than that it's doing exactly what it's designed to do.


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Old 01-17-2015, 12:54 PM   #3
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It is doing what it is designed to do but the oil that collects in the intake can, over time, make a big gooey mess!
A number of oil catch cans are available from different manufacturers, that basically install between the PCV valve and the intake manifold. These catch cans separate the oil from the air, that is vented from the crankcase, and prevents it from entering the intake.
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Old 01-17-2015, 01:15 PM   #4
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Okay cool thanks for the replies guys, I think I'm gonna invest in a catch can then. Im pretty sure there's too much oil because when I pulled the CAI off it was in fact dripping a bit (there was probably about a half teaspoon of oil in the intake). I guess I just don't like everything in my intake being caked with oil even if its normal

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Old 01-17-2015, 08:21 PM   #5
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We have a couple very nice units here:

Steeda 2005-14 Mustang Billet Oil Separator - Made in USA 555-3712 - Free Shipping!

Let me know if I can help assist with a price ... you can reach me at tim@steeda.com.

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Old 01-18-2015, 12:21 AM   #6
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Of course your intake is going to have oil in it from your air filter oil and from your valve cover to breath.

I mean if you don't like it you can delete all cable breathing tubes to the cover with filters over the covers and plugged hole in intake and don't spray oil on your filter. But that beats the purpose of all the components for the car.


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Old 01-18-2015, 11:18 PM   #7
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Maybe I just never noticed it before with the stock air intake, but regardless I'd rather my throttle body and intake not be caked with oil. I'll look into a catch can but I might not bother.

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Old 01-18-2015, 11:20 PM   #8
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You can if you want. It's up to you man, your car your build. ;P


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Old 01-19-2015, 01:03 AM   #9
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I wish that I had taken some pictures of the intake manifold and the cylinder head intake ports of my high mileage (380k miles) 460 engine. It was pretty bad!
This thread actually has me considering installing a catch can on all of my vehicles.

I've seen a thread somewhere about building a homemade catch can using, off-the-shelf, HomeDepot parts.
That may be something to look into as well...
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Old 01-19-2015, 06:23 AM   #10
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Yea i saw people doin that on a hyundai forum.

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Old 01-19-2015, 06:49 AM   #11
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I just deleted my valve tubes plugged the holes in my intake and put filters over my valve covers.


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Old 01-21-2015, 12:34 PM   #12
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Quote:
Originally Posted by Speed_Mister View Post
I just deleted my valve tubes plugged the holes in my intake and put filters over my valve covers.


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Do you have any pictures or links of the parts you used? I know this method is pretty recommended for higher horsepower cars and boosted applications right? Regardless I think I would like the look of that it probably cleans the engine bay up.

But I plan to do a catch can or something similar as I really don't like having my intake caked with oil. Just seems like more of a bad thing than a good thing.

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Old 01-21-2015, 02:18 PM   #13
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Click image for larger version

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I just pick stuff up from the local car store that will work to block it off and not fall into the intake.


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Old 01-23-2015, 03:56 PM   #14
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Attachment 173948

I just pick stuff up from the local car store that will work to block it off and not fall into the intake.


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Okay and did you put breathers on both the valve covers?

Seems like a pretty inexpensive route to go, I'm definitely gonna look into this.
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Old 01-23-2015, 06:12 PM   #15
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It costs like 4$. Lol


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Old 01-24-2015, 06:40 PM   #16
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I got a oil catch can on pvc valve side from jlt performance. It catches a good bit of oil to couldn't believe it. Your exhaust smoke a lot?
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Old 01-26-2015, 03:27 PM   #17
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I got a oil catch can on pvc valve side from jlt performance. It catches a good bit of oil to couldn't believe it. Your exhaust smoke a lot?
My exhaust smokes a lil bit but I feel like its not too much. Do you just need one catch can? I know some people have one on each side.

I think I'm gonna go with a catch can, I don't want to completely remove the PCV system. But I've got all winter to decide lol

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Old 01-26-2015, 06:35 PM   #18
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My exhaust smokes a lil bit but I feel like its not too much. Do you just need one catch can? I know some people have one on each side.

I think I'm gonna go with a catch can, I don't want to completely remove the PCV system. But I've got all winter to decide lol

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Umm yeah don't remove the pcv system whatever you do it vents the crankcase. Our New edge cars have a oil pressure issue so to speak of excessive oil pressure on the pcv side valve cover. You only need one I wasted money and got two to be sure no oil got in there or very little and the driver side can collects nothing at all. I always do research if I don't know or am unsure about something, than ask questions after the fact. But Ya good idea to get a catch can bro. Oil shouldn't mix with air/fuel.
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Old 01-26-2015, 10:45 PM   #19
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Umm yeah don't remove the pcv system whatever you do it vents the crankcase. Our New edge cars have a oil pressure issue so to speak of excessive oil pressure on the pcv side valve cover. You only need one I wasted money and got two to be sure no oil got in there or very little and the driver side can collects nothing at all. I always do research if I don't know or am unsure about something, than ask questions after the fact. But Ya good idea to get a catch can bro. Oil shouldn't mix with air/fuel.

As long as you put a filter over the valve cover you should be good.


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Old 01-27-2015, 05:00 AM   #20
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As long as you put a filter over the valve cover you should be good.


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Those filters get soaked with oil through time then it leaks down your valve covers because the filter isn't breathing as well soaked with oil.
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Old 01-27-2015, 11:36 AM   #21
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Those filters get soaked with oil through time then it leaks down your valve covers because the filter isn't breathing as well soaked with oil.
wash em with a k&N kit or something similar.
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Old 01-27-2015, 03:04 PM   #22
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Those filters get soaked with oil through time then it leaks down your valve covers because the filter isn't breathing as well soaked with oil.

Just clean them every time you clean your air filter.


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Old 02-14-2015, 02:53 PM   #23
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We have a couple very nice units here:

Steeda 2005-14 Mustang Billet Oil Separator - Made in USA 555-3712 - Free Shipping!

Let me know if I can help assist with a price ... you can reach me at tim@steeda.com.

Best Regards,

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I have been running this drier/filter for years & works great.
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Old 02-14-2015, 06:36 PM   #24
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I have been running this drier/filter for years & works great.


Should do a write up on how to piece all this together and install.


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Old 02-16-2015, 12:48 PM   #25
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Should do a write up on how to piece all this together and install.

Ordered from Steeda (JLT have nice ones too). Comes with directions. Actually takes 10 minutes to install. One hose connects to pcv valve, other hose plugs into intake. Fills quickly. It is a MUST have part for our cars. Have one on the Cobra and on the 3.8L Coupe.
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Old 02-22-2015, 04:11 PM   #26
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Looks like a good deal, I'll be picking one of these up once I get closer to finishing my cam swap

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