ventilation hose no 2. part number 12262 62060

So question is does anyone know what this is, and whats it for. hose going from little plastic deal on the intake tube to driver side valve cover. Second pcv valve? It has oil residue in it, not bad but a little amount.

 

that one is open on mine as well. possibly pre-03 TB setup? ours has the ETC-s (or w/e the letters are) and a motorized assist on the back of the TB

 

i knew i should have clarified. I ONLY REMOVED THE HOSE FOR THE PIC. I put it back on afterwards.... Whats an "ETC". I did start the truck and removed the hose on the intake tube side, and noticed the rpms went down a little, but only like 50 rpms.that was while the truck was in park..

 

check your other thread

I was talking about the tiny one on top of the intake for the first pic you circled.

 

That is the filtered air "source" for the PVC system. It's the fresh air that "ventilates" the crankcase/valve cover areas.
In theory, air is continuously drawn thru the the engines internal voids (driver valve cover>crankcase>pass valve cover>PCV valve>little hose to manifold) by manifold vacuum. This flow is metered by the PCV valve and is intended to carry any oily gasses that leak past piston rings and valve guides along with it to be burnt in the engine.
Oil present in that hose indicates the engine is producing more of these gasses than the PCV valve will allow thru. Hence the excess gasses back up and condense in the tube.
Could be a sticking/clogged PCV valve and/or a restriction/clog in the little hose from the valve to the manifold and/or worn rings/valve guides. Extended high loads or "spirited" driving can also cause a temporary back up and leave a little tell tail oil trace.

 

Thank you for this explanation, I've wondered what the purpose of this oil well was for a while. Both of my 3.4's have standing oil in the throttle body from this guy, both with new PCV's. I guess I shouldn't plug the intake and put an open filter on the hose if it's supposed to "draw" air in. Maybe I'll do a catch can of sorts.

 

I as well thought about a catch can, or some sort of filter on that line. Aside from maybe not passing CA smog, would that harm the system in any way? Please just let it be spirited driving and not rings, or valves OR ANYTHING INTERNAL!!!!!

 

+1

I see it as unlikely that both of my 3.4's with a difference of 100K on them would both have shot rings. And I'm no expert, but I wouldn't think a catch can would hurt emissions. Same closed system.

 

I guess your right about it still being a closed system, however it probably wouldn't pass visual, though i could just disconnect it. One way to check the valves and rings would be a compression check., but i dont have a guage. As stated in my thread about rough idle i plan to seafoam my cylinders this weekend, maybe. However, currently im laid up with a blown out back... Hence the maybe..

 

There have been numerous cases of oil in that line on perfectly good engines with "claimed" good PCV valves. FWIW I would not trust aftermarket PVC valves to meet Toyota's "3 stage flow rates".
Not all 3.4's have that little box between the hose and the main rubber intake tube. I believe that box is a catch can of sorts intended to catch this "nuisance oil". I have never seen one close up but it might be constructed to catch/condense the oil and let it drain back down the hose into the valve cover. Maybe one of you folks that has one could make a close examination of it and see if that's reasonable.

Also don't rule out a restriction in the little PVC hose or the fitting on the intake.

 

Valid points, but I replaced both valves myself with OEM valves. I did one last year and the other last month.

 

I think your right, i think that is a "toyota" catch can, albeit a very crude one that doesn't seem to catch much. I already bought a catch can for the actual pcv system, should have it installed next week, if all goes well. Would it hurt to have two? Even under the theory of a closed system..? Not something I plan to do, but its an interesting thought. Oh and on another note, after a failed 5 month old O'Reillys pcv grommet, i think ill start using oem..

 

So, for those who care, heres a pic of that little plastic piece on the intake tube right before the tb on an 04 dc prerunner, the "catch can" if you will.

 

Smokn, did you replace the valve on the driver side valve cover? I thought, JUST BY THE LOOKS OF IT, that was/is a non replaceable part.

 

I did indeed. I did it along with valve cover gaskets. It's replaceable, you just need to replace the grommet at the same time. Together they cost about $10 IIRC.

Oh, and no Toyota catch can on my 01.

 

So it IS an actual valve, not just a vent tube. By any chance did you take pics? Do you recall the part number? What does iirc mean? Sorry im still learning some Internet abbreviations...

 

Thanks for putting them up.
From the placement and elevation of the "little" hose connection on the box, it sure looks like any captured or condensed oil would drain into the main intake hose instead of back down into the driver side valve cover.
I'm thinking the box may have more to do with mitigating some effect the pulsing nature of the main intake air stream has on that end of the PVC system. Hard to say.

In case there is a poll, my 99 does not have the box and the hose is dry as a bone. I have occasionally noticed the bottom of the t-body to be damp with oil but that was coming from the PCV valve hose. FWIW I cut in a catch can in the regular spot, between the valve and the manifold. This was done just out of curiosity related to a theory I had. It has not "caught" any more than a film or a few drops of oil since Nov.

 

Yes, most definitely a valve. A progressive valve at that. Because the PVC system is essentially a vacuum leak, it must be regulated to an amount low enough to not harm proper air/fuel management at all engine speeds and vacuum levels.

IIRC = if I remember correctly
FWIW = for what it's worth

 

Let me just clear this up in my head, cause last night i was thinking of multiple ways of doing my catch can when it arrives. Air goes into the toyota made catch can I PICTURED, therefore goes in to the motor/engine on the driver side valve cover, then comes out the pcv, and into the intake plenum.. Make sense? If not I'll make a drawing and that would explain better. I thought about putting an inline filter on the vent hose that this thread is abou. kinda under the idea that i can see if oil is going back into the intak. which would also, in theory, let me know if the pcv is bad... Yay, nay?

 

What Dirty said. Post 22 on the 2nd page of this thread has the PN's you need. Also, this thread is probably the best as far as info for valve cover gaskets and related stuff.