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post #1 of 30 (permalink) Old 10-25-2019, 07:27 PM Thread Starter
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Help! Oil shooting out VC PCV Tube at WOT!

So....As the title says...

SO I took off the valve cover to intake tube with the Check valve because it was clogged and then I vented to atmosphere. IT's been running perfectly for over two years.

So right after I get the car back for the rear diff and do some WOT pulls it now is shooting like a table spoon of oil out that tube when I do a WOT pull, and when I cleaned up the oil it smells somewhat like gas as well. I've attached a pic of the filter over that tube so you know where I'm talking about.

My car runs and drives great and this only happens at WOT. Does anyone have any idea why it would do this, or what I could do short of getting a new engine?

GOd I really hope this is somehting simple!! If not I'm torching this car!!!

I'd appreciate any help you guys can give me.

Help!  Oil shooting out VC PCV Tube at WOT!-egr-breather.jpg
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post #2 of 30 (permalink) Old 10-25-2019, 10:09 PM
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Sounds like your PCV may be stuck open. I can't remember if it should only allow air to come in or air to go out but I want to say it shouldn't let air go back out into the intake. If oil is coming out like that...may be a problem in that line.


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post #3 of 30 (permalink) Old 10-26-2019, 07:00 PM Thread Starter
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Are you talking about the line from the vc to the intake? I took that off.

Are you saying the pcv that goes into the manifold is messed up?
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post #4 of 30 (permalink) Old 10-26-2019, 10:02 PM
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Guys, re-read his post and look at his picture. He's removed the breather hose and vented through a filter.

@MattM - gas in the oil is generally a signifier that the seal(s) has gone on your HPFP (high pressure fuel pump) and that you need to replace it. I guess it could've gone badly enough that it's pressurizing the top end, but not sure.

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post #5 of 30 (permalink) Old 10-27-2019, 02:38 AM
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Guys, re-read his post and look at his picture. He's removed the breather hose and vented through a filter.

@MattM - gas in the oil is generally a signifier that the seal(s) has gone on your HPFP (high pressure fuel pump) and that you need to replace it. I guess it could've gone badly enough that it's pressurizing the top end, but not sure.
My understanding is that breather hose has a one way check valve in it at the intake. Again.
.I dont have an LNF in my possession to familiarize myself with it but it is my understanding that this particular line does not play well when routed without the check valve.


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post #6 of 30 (permalink) Old 10-28-2019, 09:01 AM Thread Starter
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Guys, re-read his post and look at his picture. He's removed the breather hose and vented through a filter.

@MattM - gas in the oil is generally a signifier that the seal(s) has gone on your HPFP (high pressure fuel pump) and that you need to replace it. I guess it could've gone badly enough that it's pressurizing the top end, but not sure.
Hey Tomato soup thanks for the reply. So have you heard of this type of thing shooting oil out the pcv? Also I would need to drop the gas tank to get at the pump correct?
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post #7 of 30 (permalink) Old 10-28-2019, 09:39 AM
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Hey Tomato soup thanks for the reply. So have you heard of this type of thing shooting oil out the pcv? Also I would need to drop the gas tank to get at the pump correct?
No and No. The HPFP is attached to the top of the engine, just in front of the driver. See: https://www.solsticeforum.com/thread...p-hpfp.141657/

As I said before: "I guess it could've gone badly enough that it's pressurizing the top end, but not sure."

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post #8 of 30 (permalink) Old 10-28-2019, 10:38 AM
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That nipple where you have the filter hooked to has no baffling behind it to stop oil vapor from coming out through there. That is why there is a check valve on the stock piece that goes to the intake. There is supposed to be a one way flow of air from the intake to the valve cover through that hose only, so no baffling is needed on the back of that nipple. The nipple on the front of the valve cover has to go through a bunch of baffling inside the valve cover to catch oil vapor, sort of a built in catch can.

None the less, if you are getting excessive oil out of that nipple the only cause I can think of would be a big increase in crank case pressure caused by blow by in the engine. You should also check the inlet to the turbo for oil also, as you should be getting more coming out of the nipple on the front of the valve cover also. Most likely if you remove the black plastic intake tube you will find oil where it meets the turbo inlet. Do a compression and leakdown check, I am guessing that will show you what is going on with your engine.

Since the fuel is directly injected into the cylinder, there would be no way to pressurize the top end of the engine with fuel pressure. If he is getting blow by from one or more cylinders, most likely that is where the fuel is also getting into the bottom of the engine and oil causing the smell.

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post #9 of 30 (permalink) Old 10-28-2019, 10:56 AM
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Replied on Kappaperf thread.

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post #10 of 30 (permalink) Old 10-28-2019, 10:57 AM
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That nipple where you have the filter hooked to has no baffling behind it to stop oil vapor from coming out through there. That is why there is a check valve on the stock piece that goes to the intake. There is supposed to be a one way flow of air from the intake to the valve cover through that hose only, so no baffling is needed on the back of that nipple. The nipple on the front of the valve cover has to go through a bunch of baffling inside the valve cover to catch oil vapor, sort of a built in catch can.
So that is what I was thinking when it came to that line. I didn't know how much pressure was supposed to be behind it but I did think that fitting at the intake was a check valve.

Matt, based on what Dave has said here, have you pulled the dipstick and checked to see if the oil smells like gas? I'd think if you were getting blow by you'd be able to smell it here too.


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post #11 of 30 (permalink) Old 10-28-2019, 01:36 PM Thread Starter
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Originally Posted by [email protected] View Post
That nipple where you have the filter hooked to has no baffling behind it to stop oil vapor from coming out through there. That is why there is a check valve on the stock piece that goes to the intake. There is supposed to be a one way flow of air from the intake to the valve cover through that hose only, so no baffling is needed on the back of that nipple. The nipple on the front of the valve cover has to go through a bunch of baffling inside the valve cover to catch oil vapor, sort of a built in catch can.

None the less, if you are getting excessive oil out of that nipple the only cause I can think of would be a big increase in crank case pressure caused by blow by in the engine. You should also check the inlet to the turbo for oil also, as you should be getting more coming out of the nipple on the front of the valve cover also. Most likely if you remove the black plastic intake tube you will find oil where it meets the turbo inlet. Do a compression and leakdown check, I am guessing that will show you what is going on with your engine.

Since the fuel is directly injected into the cylinder, there would be no way to pressurize the top end of the engine with fuel pressure. If he is getting blow by from one or more cylinders, most likely that is where the fuel is also getting into the bottom of the engine and oil causing the smell.
Hey Dave, I have one hopeful question for you.

Is it possible that my engine is now making so much power (it only does it at WOT and full boost) that I'm just overloading that side of the PCV system? And if I put a one way valve on it I could still be ok? Like I said, it's only happening at WOT with higher RPMS.
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post #12 of 30 (permalink) Old 10-28-2019, 01:44 PM
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Quote:
Originally Posted by MattM View Post
Hey Dave, I have one hopeful question for you.

Is it possible that my engine is now making so much power (it only does it at WOT and full boost) that I'm just overloading that side of the PCV system? And if I put a one way valve on it I could still be ok? Like I said, it's only happening at WOT with higher RPMS.
Did you change the power of the engine? I read your original post as nothing has changed for 2 years and after the differential swap, you are getting the oil out of the filter?

When under full boost and WOT is going to be the worst case for blow by into the crankcase, leakdown and compression test will rule that out or let you know either way.

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post #13 of 30 (permalink) Old 10-28-2019, 07:15 PM Thread Starter
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Did you change the power of the engine? I read your original post as nothing has changed for 2 years and after the differential swap, you are getting the oil out of the filter?

When under full boost and WOT is going to be the worst case for blow by into the crankcase, leakdown and compression test will rule that out or let you know either way.
Yes, kind of. My car always had a weird hesitation after 5000rpms at WOT where it would pull then not pull etc. ONce my MAP sensor finally went out it's been pulling really hard up to 6000rpms now.

That said, after talking everything over with you I did add the line back to the nipple with the check valve at the end (but not running back to intake) and guess what?! No more oil blowing out! I go out and basically tak e it all the way through redline in 2nd and 3rd a number of times and to the best that I can tell I'm not getting more oil leaking. I still have yet to burn off the oil that was shot everywhere, but it's lessoning and lessoning. It still pulls really hard and no misses no smoke out the tailpipe. For now, I'm just going to call it a win.

My oil does smell a tiny bit like gas though, so I'm guessing maybe I might be down slightly on one cylinder, but at this point I don't really care (as long as it runs and drives great). Maybe I'll put some thicker oil in it to help with the blowby or something.

Anyway Dave, thanks for the advise! At least my car is drivable at this point!
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post #14 of 30 (permalink) Old 11-05-2019, 02:04 PM Thread Starter
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Am having a hard time reading the dipstick to determine if there is too much oil. Does this look perfect or too full?
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post #15 of 30 (permalink) Old 11-05-2019, 02:21 PM
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Am having a hard time reading the dipstick to determine if there is too much oil. Does this look perfect or too full?
I'm looking at that dipstick and maybe I'm just really old and my eyesight is really gone but I don't see any oil on that.


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