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Oil in intake manifold...?

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Old 07-15-2013, 11:19 PM   #1
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Oil in intake manifold...?

I cleaned my throttle body and intake manifold today and I noticed a good amount of oil in the manifold and near the intake valves. Im pretty sure this isn't a normal thing. Can anyone tell me whats going on or what I need to do? Any input is helpful


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Old 07-15-2013, 11:50 PM   #2
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Originally Posted by TACOMABOSS View Post
I cleaned my throttle body and intake manifold today and I noticed a good amount of oil in the manifold and near the intake valves. Im pretty sure this isn't a normal thing. Can anyone tell me whats going on or what I need to do? Any input is helpful


Probably just lots of miles sucking down the blow-by gases and vaporized oil coming from the PCV valve. Look upstream in the induction system in your plenum and all the way to the throttle body, and also on the front side of the throttle body. I bet they are pretty dirty too.
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Old 07-15-2013, 11:53 PM   #3
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Originally Posted by scocar View Post
Probably just lots of miles sucking down the blow-by gases and vaporized oil coming from the PCV valve. Look upstream in the unduction system in your plenum and all the way to the throttle body, and also on the front side of the throttle body. I bet they are pretty dirty too.
I cleaned all that up today. There wasn't a whole lot but there was some. Seems the further I got into the engine, the more oil I was seeing
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Old 07-16-2013, 12:02 AM   #4
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Originally Posted by TACOMABOSS View Post
I cleaned all that up today. There wasn't a whole lot but there was some. Seems the further I got into the engine, the more oil I was seeing
Oh duh, you already said that.
Are you consuming oil?
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Old 07-16-2013, 12:04 AM   #5
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Why are you tearing it apart? Because my next question is have you done a compression test on it? Could be worn valve guides, or maybe even rings.

Are you consuming oil?
My original intention was to clean up the throttle body. No I haven't done a compression test and no I don't use any oil
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Old 07-16-2013, 04:46 AM   #6
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Originally Posted by TACOMABOSS View Post
I cleaned all that up today. There wasn't a whole lot but there was some. Seems the further I got into the engine, the more oil I was seeing
This cant be too bad of a thing right??
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Old 07-16-2013, 08:38 AM   #7
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I dont use any oil. Could this be a pcv valve issue? Or is this this a normal thing?
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Old 07-16-2013, 08:44 AM   #8
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This is a normal condition. PCV stands for Positive Crankcase Ventilation. The system is DESIGNED to take unburned gasses that normally get into the oil crankcase and draw them into the intake system, to be burned. This in turn does draw some oil vapor, which will deposit trace amounts on the cooler intake runners. Normal condition completely.
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Old 07-16-2013, 08:47 AM   #9
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pretty normal. I had my intake off to put the spacer in and my '12 had oil in the intake... I have a air/oil separator that I put on in the summer and take off in the winter but it hasnt gone back on yet this summer which is why I had oil in the intake when i looked recently. Look into an oil catch can or air/oil separator if you want to stop the oil from getting into your intake...

Edit: beat me to it bill
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Old 07-16-2013, 09:02 AM   #11
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No problem. That is what we are all here for!
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Old 07-16-2013, 02:22 PM   #13
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I run a catch can to prevent that 'ish. MPGs went up- figured that is because it was catching water vapor (evaps from oil from water condensation in case) that otherwise was sucking up some BTUs here and there. Anyhow nice to know those vapors are not depositing in the intake track causing a rough surface, more air friction and such. On direct injected cars the catch cans are crucial, they do not have port injectors to clean that crud off of the intake valves, causing big issues as time goes by.
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Old 07-16-2013, 02:37 PM   #14
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Quote:
Originally Posted by SconnieHailer View Post
Bill, how much do you stand to gain realistically by running a catch can and stopping most of that from getting down the runners?
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I run a catch can to prevent that 'ish. MPGs went up- figured that is because it was catching water vapor (evaps from oil from water condensation in case) that otherwise was sucking up some BTUs here and there. Anyhow nice to know those vapors are not depositing in the intake track causing a rough surface, more air friction and such. On direct injected cars the catch cans are crucial, they do not have port injectors to clean that crud off of the intake valves, causing big issues as time goes by.

Not trying to sound anti-anything here, but there is no evidence to prove that any kind of "catch can" system will improve MPG. There is no basis in how the PCV system operated to support this. MPG will change based on driving conditions, weather, fuel quality, etc. Even a small amount of water vapor will not affect fuel economy enough to notice a difference. Trust me, if a catch can system WAS something that improved MPG, the factory would install it! Anything that can help sales numbers they would use.
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Old 07-16-2013, 04:27 PM   #16
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Quote:
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Yea I could care less about MPG via a air/oil separator. I was more getting at how good of an idea is it to run a catch can?
Im curious about this as well
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Old 07-16-2013, 06:16 PM   #17
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Quote:
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Yea I could care less about MPG via a air/oil separator. I was more getting at how good of an idea is it to run a catch can?
Pretty sure it is a really good idea. Helps keep your engine cleaner by removing the oil rather than trying to burn it off. The consensus seems to be that the average person already sucks at doing basic vehicle maintenance so no point in adding even more maintenance to a vehicle... which is why companies don't install them from the factory.

Group buy going on right now for some good ones. We have basically met the max discount already too!

http://www.tacomaworld.com/forum/gro...group-buy.html
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Old 07-16-2013, 08:02 PM   #18
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I actually already have one installed but curious if leaving it on will really make my motor that much better after 200k miles and thought bill might have some great insight
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Old 07-16-2013, 08:09 PM   #20
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I also ran into a problem with it freezing in the winter... so i took it off for the winter months
Interesting.
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