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What kind of car do you have? i may be able to further assist if i know what kind of vehicle you have.
That is your crankcase ventilation tube, its possible that you may be having issues with a stuck Positive Crankcase Ventilation Valve… sometimes they get stuck into a position and oil ends up getting coughed up into the intake, clean out your intake assembly and the hose, replace the valve if you can or clean the valve out, see if that makes any difference.
How old is the car, how many miles? How often do you need to add oil?
If it’s just a light misting of oil, there shouldn’t be a problem. If you have puddles of oil in the intake, that’s a different story.
When an engine wears and gets sloppy internally, (cylinder bores, piston rings), you’ll begin experiencing “blow-by”, where combustion pressure leaks past the rings and cylinders and pressurizes the crankcase. The result is oil mist getting burped through the PCV system, and it coalesces in the intake plumbing. If there’s enough liquid oil in the intake, you’re likely burning some of it, which isn’t doing your spark plugs, combustion chambers and catalytic converter any favors.
It’s not an immediately fatal condition, but it’s an indicator of an aging engine. The only cure is a proper rebuild requiring cylinder reboring and oversize pistons and rings to suit. If you need to top up your oil often, and if you are using synthetic oil, now would be a good time to switch to plain old conventional oil. When an engine begins consuming oil, the money spent on synthetic is wasted and the benefits of synthetic become largely hypothetical.
Hello,
Its a mazda protege ’99. 250k miles. interior of intake rubber hose has flimsy presence of oil. its not a puddle by any means. its quite slippery. as the oil accumulates over period of time, it then travels into the intake manifold as well, as the air blows thru the intake system.
conventional oil in use, not synthetic at all.
havent seen oil leaks on the floor, no oil in tail pipe or spark plugs.
pcv is fine.car isnt experiencing start issue or running issue because of the oil in that area. compression is about 180 psi in each cylinder. it starts on the first take of the ignition switch turn.
just dont want to over look something that could result into issues later on.so looks like, the oil there is all normal.
is there anything in the inside of the valve cover need to be replaced? not the gasket but where the screws are holding plates. is there anything underneath the plate need to be replaced to stop the oil leak into the intake system?
It’s normal for oil residue to be there, being a normal side-effect of having a PCV system. That oil residue from crankcase air venting is inevitable, and having it routed back into the engine like it is is a federally mandated emissions control devices for which it’s been determined by the powers that be that that oil residue is considered an acceptable side effect. I have a car with a open breather because on that particular car I don’t want the intake tract to be dirty inside. The end of the breather hose is attached to a oil separator/catch can that needs to be drained of it’s oil/moisture mixture periodically. Without that catch can, there would be the same oil residue you have making a mess all around wherever that hose vented.
[quote=”aguy01″ post=146181]Hello,
Its a mazda protege ’99. 250k miles. interior of intake rubber hose has flimsy presence of oil. its not a puddle by any means. its quite slippery. as the oil accumulates over period of time, it then travels into the intake manifold as well, as the air blows thru the intake system.
conventional oil in use, not synthetic at all.
havent seen oil leaks on the floor, no oil in tail pipe or spark plugs.
pcv is fine.car isnt experiencing start issue or running issue because of the oil in that area. compression is about 180 psi in each cylinder. it starts on the first take of the ignition switch turn.
just dont want to over look something that could result into issues later on.so looks like, the oil there is all normal.
is there anything in the inside of the valve cover need to be replaced? not the gasket but where the screws are holding plates. is there anything underneath the plate need to be replaced to stop the oil leak into the intake system?[/quote]
Its an old engine with lots of miles so over time you are going to get that oil residue build up in your intake system.. Lots of owners are fitting legal catch cans to their crank case gas recirculation systems including on brand new cars because they want to eliminate oil residue in their intakes. It is a pretty common mod these days. It is quite simple and you can buy a generic kit for your car if you want to get rid of the future oil build up.. The oil mist from the crank case enters the can before the intake and most of it is captured in the can and drops to the bottom. The gasses that are left return to the intake system relatively free of most of the oil residue. But you need to drain the can every few months or so depending on how much fluid you accumulate.
It works like this…………………..(or just google “catch cans”)
http://www.americanmuscle.com/94-catch-me-if-you-can-99-04-mustangs.html
If you want to eliminate the oil then get a sealed catch can system (ie. NOT a vented type can ) fitted but in such an old car it is possibly not worth the trouble and cost. But its up to you and it is possible to remove the can and reinstate the original plumbing and then fit the system to your next car.
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