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post #1 of 13 (permalink) Old 01-13-2013, 08:09 AM Thread Starter
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Oil in Intake Manifold

Hi all!
I've been taking care of maintenance on the girlfriends car, a 2006 Cobalt LE with 2.2 engine, about 110,000 miles. She bought the car used 4 years ago and has been diligent in changing oil. I have been using full synthetic when she asks for oil to changed, when the message center lets her know it's due, for the past 3 years.

She complained the car nearly stalls at stops occasionally. So I removed the throttle body to clean it. It was dirty, clean now, but I noticed a puddle of oil in the bottom of the intake manifold. Also there is some white goo in the air box above the throttle body and in the rubber tube that runs from valve cover to the air box. The coolant level is normal, and she drives long enough usually to fully warm the engine, about 20 minutes to work.

So I am thinking there is there is some blow by or a problem with the PCV system and not sure about the white goo. I've seen to goo on other cars that are used for short distance driving. But not quite as much, there might have been 1 to 2 ounces of the white goo. I used a long screwdriver as a dipstick to measure how much oil is in the intake manifold. Looks like about 3/16".

How does this PCV system work? Haynes manual shows only the tube from the valve cover to the air box and a baffle in the valve cover as being the entire PCV system. Seems like there should be an actual PCV valve or another vent somewhere.

I am thinking of adding a catch can unless there is some other simple problem to repaired. The car does not use oil between oil changes. Perhaps it's wrong to say none, but it is not evident on the dipstick between oil changes, so perhaps a few ounces per oil change adds up in the bottom of the intake manifold over many oil changes.

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post #2 of 13 (permalink) Old 01-13-2013, 09:26 AM
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The white goo is a mixture of water (from condensation) and oil components. This should all be normal when your throttle body get's dirty. Now that you've cleaned the throttle body and I assume the oil at the bottom of the intake you should be good. But you could still check at next oil change to make sure. Also run a pipe cleaner through the spigot at the valve cover PCV to make sure it is clear of sludge or debris.

Oh! This can also happen if you overfill with oil!

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post #3 of 13 (permalink) Old 01-13-2013, 03:06 PM Thread Starter
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I hope it's normal and will keep an eye on the oil level. Spigot was cleaned out but there is still oil in bottom of the manifold.
Thanks

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post #4 of 13 (permalink) Old 01-17-2013, 01:17 PM
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this condition is normal. no need to worry. most car manufactures have this issue as well but most the time you will see it under the oil cap. This is most often seen during cold climate conditions. It is a small amount that builds in the engine and eventually will burn off. almost the same effect as dew on grass.



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post #5 of 13 (permalink) Old 01-17-2013, 01:19 PM
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Um, what? Typically the white goo under the oil cap means you have coolant and oil mixing.


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post #6 of 13 (permalink) Old 01-17-2013, 01:21 PM
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Re: Oil in Intake Manifold

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Originally Posted by Chester View Post
this condition is normal. no need to worry. most car manufactures have this issue as well but most the time you will see it under the oil cap. This is most often seen during cold climate conditions. It is a small amount that builds in the engine and eventually will burn off. almost the same effect as dew on grass.
X2. Normally from a lot of short trips that don't let the oil heat up

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post #7 of 13 (permalink) Old 01-18-2013, 06:41 AM
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Quote:
Originally Posted by Blackbalts View Post
Um, what? Typically the white goo under the oil cap means you have coolant and oil mixing.
If coolant and oil were mixing it wouldn't be white, it would be a peanut butter color. White on the oil cap is just water condensation from the crank. Not a big deal, could be a PCV valve not working fully, or at all lol.

Now to the OP's problem, this is common with 99% of the cars in the world today. Some cars is because of a bad PCV, some cars is because of the valve cover breather that runs right back to the intake pipe, some are because of the TB ports, leaking valve seals, ect ect.. What I'm saying, it's normal to have oil (a little, not a LOT), sitting on bottom of your intake manifold. I don't think there has ever been a car I've torn apart that hasn't had that. My evo which I take care of myselt (Master Certified Technician mind you), I still have that in my car. I'm trying to find a way to keep it from doing that, but at the same time, I'm not that worried about it unless I start getting the pacific ocean in there, then we have some issues lol.

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post #8 of 13 (permalink) Old 01-18-2013, 07:15 AM
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Oil in Intake Manifold

Quote:
Originally Posted by Leveecius View Post
If coolant and oil were mixing it wouldn't be white, it would be a peanut butter color. White on the oil cap is just water condensation from the crank. Not a big deal, could be a PCV valve not working fully, or at all lol.

Now to the OP's problem, this is common with 99% of the cars in the world today. Some cars is because of a bad PCV, some cars is because of the valve cover breather that runs right back to the intake pipe, some are because of the TB ports, leaking valve seals, ect ect.. What I'm saying, it's normal to have oil (a little, not a LOT), sitting on bottom of your intake manifold. I don't think there has ever been a car I've torn apart that hasn't had that. My evo which I take care of myselt (Master Certified Technician mind you), I still have that in my car. I'm trying to find a way to keep it from doing that, but at the same time, I'm not that worried about it unless I start getting the pacific ocean in there, then we have some issues lol.
Coolant and oil mixed typically mean blown head gasket, no? And if the head gasket was blown he'd be overheating so I don't think it's oil and coolant.


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post #9 of 13 (permalink) Old 01-18-2013, 08:23 AM
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Re: Oil in Intake Manifold

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Originally Posted by Rriggs92 View Post
Coolant and oil mixed typically mean blown head gasket, no? And if the head gasket was blown he'd be overheating so I don't think it's oil and coolant.


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Intake gaskets will do that on v6 engines and bigger as well. But Yes normally head gaskets. Wouldn't necessarily overheating either, some blow air into the coolant system and some just leak some antifreeze into the cylinders.

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post #10 of 13 (permalink) Old 01-18-2013, 08:42 AM
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Quote:
Originally Posted by money_man View Post
Intake gaskets will do that on v6 engines and bigger as well. But Yes normally head gaskets. Wouldn't necessarily overheating either, some blow air into the coolant system and some just leak some antifreeze into the cylinders.
This and some actually don't do anything but leak down the side of your block lol. But yes, a peanut butter color is oil mixed with coolant, which could be head gasket, or intake gaskets. The older GM 6 cylinders (2.8 were known for head gaskets, 3.1/3100/3.4/4.3 were known for intake gaskets) going out on them and causing problems.

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