Oil in the airbox

[ironbird720]

Everytime I open my airbox it seems to be saturated with oil.I'm not sure if the oil is getting sucked up through the oil return breather hose going from the turbo or the hose coming from the valvecover where the pvc splices in.They both join to the airbox in the same spot.There is foam inside it and in the bov and I noticed it was falling apart and making a mess so I removed the foam.I'm wondering if replacing the foam with somekind of aftermarket foam would prevent the oil from getting in or can these hoses go to seperate filters for breathing?Has anyone had this problem before or have any ideas?Thanks.

[88Ddaytona88]

try posting this in the help forum instead of this one i have the same prob on a non VNT car and am interested too but def post it in the help section at the top

[90DodgeVNT]

This is common with the airbox setup on the VNT's. Most just run a crankcase breather of some type off the pcv connection. Even with the same setup, I have to clean out the breather every so often since it gets oily rather quick.

Also there was a TSB for the inside baffle/shroud on the valve cover some years back. Has to do with re-sealing the baffle with RTV to keep oil out of the airbox. Even though I did the TSB and checked it each time when I was running the stock airbox and I still had oil.

[RPMurph]

well im really not sure what the VNT airbox setup is like but i know on the N/A cars where the valve cover has that hose that connects to the airbox ya put a filter right on that hose

im sure your airbox is VERY different but it should at least give you an idea of something you can do

[ironbird720]

On my vnt that hose that comes from the valvecover goes to a special little compartment on the side of the airbox which I believe comes stock with foam.And there is another hose that conects to the botom of the compartment which is then conected to the turbo oil return line.To help breath I guess,but the turbo must be sucking oil from one of these two hoses I wonder if I can run those to hoses to a seperate filter like yours?

[Dave]

The turbo would not be "sucking" the air from that pocket in the air box. Your turbo is getting oil from the HEX. The oil sending unit at the bottom of the front of the block. Looks like a hectogon.

[Whorse]

Quote:

Originally Posted by ironbird720 On my vnt that hose that comes from the valvecover goes to a special little compartment on the side of the airbox which I believe comes stock with foam.And there is another hose that conects to the botom of the compartment which is then conected to the turbo oil return line.To help breath I guess,but the turbo must be sucking oil from one of these two hoses I wonder if I can run those to hoses to a seperate filter like yours?

That hose from your valvecover is for your PCV. I noticed a lot of oil in my airbox as well and I replaced my PCV, cleaned the hoses with alcohol, and replaced a cracked T connector.

The small connection right below where your PCV hose connects goes to the back right of the intake manifold, and it's the source of vaccuum for your BOV. On the bottom there's a larger hose that runs from the turbo output hose to the airbox which bleeds out the air when the BOV is opened by the vaccuum from the intake manifold.

I'd recommend cleaning all your hoses from your turbo to your intercooler and throttle body, clean the throttle body out a bit, do a swab of the intake manifold for oil, possibly replace or else clean your PCV valve (cheap). Remember that the PCV will bring some oil from the crankcase back to the airbox, which is what the foam is for.

Best of luck.

[ironbird720]

Sorry for the confusion,I know the hose sticking out of the valvecover has a T on it.One where the pcv goes and the other way goes to the top of the smaller compartment on the air cleaner.On the same compartment but on the bottom the hose goes down and tees into the oil return line from turbo.I have the bov hose going to the back of intake where the brake booster hose tees in.And finally theres a hose on the top rear of the airbox tat tees and one hose goes to the bottom nipple on the turbo and the other hose tees in with the cruise control and goes to the brake booster.If this is right wich my diagram shows then maybe all I have to do is put some foam back in the little compartment and the bov??Still would like to know wich hoses would be safe to run to a seperate filter?

[Whorse]

If that foam is gone I'd replace it for sure as that catches a lot of the crap from the PCV and oil return. Don't quote me but I believe you can run a separate oil filter on your turbo oil feed, but not by the air box - you can put one at the back where it goes from your oil pan. A small motorcycle filter may work.

[ironbird720]

Foam is on order,hopefully this will eliminate most of the oil getting through but I was wondering if anyone has replaced the foam in the bov?I seem to be having a hard time opening it.Any suggestions?

[Whorse]

Quote:

Originally Posted by ironbird720 Foam is on order,hopefully this will eliminate most of the oil getting through but I was wondering if anyone has replaced the foam in the bov?I seem to be having a hard time opening it.Any suggestions?

Can't say I've done that, but just for you I'll go take a look and see what I can find out.

[Whorse]

Quote:

Originally Posted by Whorse Can't say I've done that, but just for you I'll go take a look and see what I can find out.

I took some pictures of it. I didn't bother taking the BOV off because it appears to have fused to the airbox. If you want to you'd have to take a slotted screwdriver to pry the cap loose and try and wiggle it off or twist it off. If you don't have much oil in your turbo outlets, I wouldn't bother changing it then.

[ironbird720]

thanks,I did try to muscle it open but it seems there is several tabs holding it together and its almost imposible to release them all.I put new foam in the pcv box and bought a new pcv.Hopefully this will stop most of the oil getting sucked in because i'm getting a little pist with the puff of smoke every once and a while. btw I think the bov sounds louder now without the foam in it.

[Whorse]

Make sure to get a Mopar PCV valve if you change it - aftermarket ones, even fram, aren't that good. Also check the PCV line for leaks - mine had one and made the world of difference.

[ironbird720]

found a replacement airbox at the wreckers today and it still has the foam in the bov so I think ill buy it.Still getting alittle smoke when I bring up the boost fast and let off.I don't think its all from the pvc hose that goes to the airbox because I replaced the foam but still get some smoke once and awhile under short boosts