I started removing my intake manifold last night to replace my intake manifold gasket. When I was looking inside my intake I noticed that it was heavily coated with burnt oil. I know that with the crankcase ventilaltion tube running to the TB that a certain ammount of it is going to get in there, but is there any way to stop or at least help prevent so much oil from entering my intake.

Thanks alot guys.

 

Actually, the tube from the passenger side valve cover to the TB is supposed to flow in the opposite direction.... it flows filtered/metered air from a port in front of the TB blades to the passenger side valve cover, where it is pulled through the crankcase by the PCV valve. If you have excessive backflow in the line, from the valve cover to the TB - and it is entraining oil droplets - it could mean you are building excessive crankcase pressure. This could be a plugged PCV valve, or excessive blowby due to worn piston rings. Take the top plate off the TB and clean it out.... it will be full of oil if you have a problem. Check it often to see how serious the problem may be.

 

It isn't "burnt oil" it is condensed fuel that forms a coating that is often referred to as "varnish" as for what you can do to prevent it, -nothing. On older engines, the wet fuel from the carburator tended to keep the stuff from building up but on newer engines the fuel is injected at the port so no washing. This also is part of the reason you get the deposits in the first place. The fuel evaporates off of the backs of the intake valves and the inside of the intake port right at the hottest part of the head when you shut the car off. The vapors condense on the intake manifold as it cools and then forms a black coating.

 

Thanks alot guys for clearing that up. I knew there was supposed to be some buildup from carbon and fuel deposites, but it just looked a bit excessive to me, that is why I assumed it may be oil.

Injuneer when I took the Plate off of the top of the TB there was some oil present but most of it didn't appear to be fresh oil. I have replaced the PCV valve a couple of months ago and it still rattles so I would guess it is still good. I am going to clean out the hard metal line coming to the PCV to see if it may be partially clogged. Any other suggestions to what this may be?