Oily sludge in air intake line

[Araesk]

I have some oily residue in the intake line by the BOV and a little after that, I am not sure what it is so I took my air intake apart and I have the pipes lying around. I took a picture to give you a rough idea of what it looks like, it's not a lot, rather just a tiny amount and it doesn't run at all when tilted.

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Should I run water through the disconnected hose and try to flush it out, then make sure it's completely dry and reattach it? I know i'm in need of new Valve cover gaskets so would that be causing this possibly?

 

[Bud92gsx]

Get a new pvc valve while your at it.

 

[Araesk]

So I should flush the line then and dry it out?

 

[dsmvenge]

Yes clean it, and dry it. Change your pcv valve. There will be some oil in the intake as the valve cover is recirculated into it. The only way I know to stop that is with a catch can.

 

[Araesk]

Went ahead and blasted out the inside of the intake, letting it dry now. Will grab a new PCV valve soon, but there is no way to stop it at all completely?

 

[WES_393]

Like dsmvenge said, the only way is a good catch can setup.

 

[synthetek]

That oil is in your intercooler too which is doing more harm than it is in the pipe you cleaned. You should clean out the intercooler and get a catch can.

 

[Araesk]

There is no intercooler mounted, only the radiator. Where would it be if not there?

 

[CellerDweller]

If you have a stock 2G, as it looks in your avatar, then it will be in front of the inside fender splash guard just forward of your passenger side wheel.

 

[delta448]

The stock side mount intercooler is mounted on the passenger side under the air box/filter. Get under the car and look, or look through the passenger side opening in the front bumper cover.

Oil that reaches the cylinders will promote detonation. If the PCV is clogged and not working, positive crankcase pressure will push oily blow-by into the intake through the vent line. That will make you knock if it gets through the intake valves, as well as coat the insides of everything from the compressor wheel all the way to the TB and kill the stock intercooler's already low efficiency.

 

[Araesk]

I thought that was a air intake with some super weird front filter on it, that's the inter cooler though? All it does is have strictly 2 hoses running to it; one to the intake manifold, the other to the exhaust manifold.

 

[delta448]

the other to the exhaust manifold

WTF

It should be connected inline between the compressor's discharge and the intake manifold. Take another look.

 

[Sebba]

That oil is in your intercooler too which is doing more harm than it is in the pipe you cleaned. You should clean out the intercooler and get a catch can.

Uuuh, no it isn't.

 

[DSM1G90]

I know that I need to take off and clean out my stock IC this summer due to I have some of the oily slime in my intake from turbo outlet to throttle body.

I have a catch can installed along with a new PCV valve, just need to figure out a catch can setup from head cover to turbo inlet.. knowing that in boost, the PCV valve closes causing pressure to be routed through the breather hose and back into the turbo inlet which this will gum up IC's real good.

Heard also .. to clean stock IC's is that some users pour some fuel in the ICS to flush them out of the gunk and crud that builds up in these units. Any other, or even better procedures would be helpful...thx.

-DSM

 

[Sebba]

Throw in .5L of gasoline into the IC, give 'er a shake, and dump.

 

[Kyle_T]

Woah another person from Muskego on here!

 

[Joethefallen23]

Uuuh, no it isn't.

The oil will cause a rise in post-intercooler IATs (compared to clean) while drastically increasing the speed at which the intercooler will heatsoak. There is far less heat dissipation when the entirety of the intercooler is covered in slugged up oil. So yea...it can.

 

[CellerDweller]

Yep, what Sebba said...Just make sure you let it sit and let the gasoline fumes evaporate. You can use mineral spirits too, still have to let it dry out though.

DSM1G90 - If you see oil on the outlet of the turbo compressor, this could mean your turbo needs to be rebuilt. Check the play in/out as well as side to side - you should have a very small amount side to side, but none in/out.

 

[synthetek]

Uuuh, no it isn't.

I meant that cleaning that one pipe isnt going to do much and oil on the inside of a pipe doesn't have as much effect on things as it does on messing up the efficiency of the intercooler when its full of oil. Its all bad once it starts reaching the cylinders. The whole system should be cleaned out, and PVC checked/replaced and a catch can installed to help prevent it from coming back. Flushing it with something besides water like mineral spirits/gas etc.. will probably help remove it all better than water. With the stock intake system setup its not uncommon to find oil all over the inside like that.

 

[Araesk]

Woah another person from Muskego on here!

Definitely have to look in meeting up some time and you might be able to help me out as I'm pretty new to cars still!

I'll go ahead and flush out the stock ICS with some fuel then tomorrow, I'll make sure to let it dry. I'll also look into the condition of the turbo, hopefully I don't need a new one.

 

[DSM1G90]

you should have a very small amount side to side, but none in/out.

Thx for the info - Shaft is good - do have the side play due to the needed oil pressure to "float" the shaft, but in/out play is tight with no motion.

What I plan on doing when I hit some vacation time come Labor Day week is do some catch-up maintenance on this Plymouth.