Thread: Oil in intake manifold...?

What exactly is this here? I don't think it's supposed to be leaking oil into the intake manifold but it is... The inside of the manifold is wet with oil from where this hose goes in..

This should cover it well .

This will solve your issues

http://www.banzai-racing.com/20B/Parts/20B_oil_catch_can.jpg

What does this do to the car by having oil in the intake manifold... Does it make it run differently?

Oil is not supposed to be there. Your engine has a problem. If you look at BenFenner's post he goes into great detail how the system works.

Basically put it's to introduce vacuum into the crank and suck out and positive pressure blowby. If you have too much blow by it will result with oil in the intake manifold. PCV Valve could be a source of oil too.

I had the same problem, it was my piston rings at fault. They were gone on the sludge monster and caused a lot of gasses from the cylinders escape into the crank.

Even if everything is working perfectly some oil will get into the intake manifold from there.

Oil vapor will be mixed into the air, when it gets incontact with cool incoming air it will start to stick to the aluminum of the intake manifold and start pudling,

Yup true, unfortunately it seems to be a bad design.

Cleaning the Throttle Body

But there was a noticeable amount in it, it seemed like it was all coming from the hose going into the intake manifold and so on. The compression is good @ 170 so if the rings were bad I'm sure it would be lower than that, right?
I guess I have to install oil catch can or something then...





I cleaned the throttle body already about 3 months ago and it's actually not that dirty, I made sure to look in and make sure.

If the throttle body is not that dirty than why worry?

What Miko said explains it all, on top of it.


(This thread gives another reason why a low port is more preferable compared to a high port.) I did not clean my throttle body or intake in over 5 years and when I did, sure it was dirty, but it was not oozing that is for sure.

Check your PCV valve, replace that $10 item. If it sticks open it might cause some problems.