Garage Storage Organization and Garage Cabinets

**glhman** · **Help me double check my PCV system**

Ok, I'm blowing oil out the dipstick, the oil filler cap, and my newly installed rear main

. The motor has about 17k miles on it. Here is my setup:

From the valve cover, it immediately goes into a T. The right line goes into a catch can, and then into the turbo inlet pipe (non pressurized). The left T goes into a check valve that is closed under boost, then into the intake manifold (as well as the MAP sensor, AFPR, ect). Is this correct? I guess maybe my check valve is busted, but other than that I'm completely lost

Thanks for any help

william · 07-11-2007, 10:32 AM

It *sounds* right... by check valve do you mean the PCV valve? If you are running the PCV valve, you don't need a check valve. Moreover, a standard check valve may be too restrictive. The less restrictive the PCV system is, the better. Run a compression test. If the compression is low and/or inconsistent the PCV system won't be able to keep up. It sounds like you might have more blow-by than you should. I cracked a piston with less than 20 K kms on my engine. I lost about 30 psi compression on one cylinder and it was enough to spray oil from every orifice.

**cawcislo** · 07-11-2007, 01:17 PM

if you're blowing oil out of the dipstick tube you've got some blowby issues.

**glhman** · 07-11-2007, 02:14 PM

Yes, my check valve is actually PVC valve.

puppet · 07-11-2007, 11:43 PM

Your CC isn't connected right.

Should be a line from the VC to one nipple on the CC. The other nipple on the CC gets the "T". One side of "T" goes to fresh air intake the other side gets the PCV valve and goes to the intake mani.

**glhman** · 07-14-2007, 01:36 AM

Yeah I know, but It's just fits underhood better that way. And that wouldn't cause this problem, would it?

firebaron90 · 07-14-2007, 01:45 AM

Oddly, I am having the same issues, just not as bad. It is just the oil cap. I changed my PCV set up to the one that CLAY described, which is to thread the rear exit of the VC, and add a 3/8NTP tap. Use a 3/8 Brass NTP "T". To the one side, add a PCV valve that threads into the ntp "T" then i run the line to the manifold. The other side of the "T" has a nipple that runs to a catch can, then to the air intake after the k and n filter. I had no such issues before this mod was done. What is wrong here??? Just a FYI my catch can is vented (had a filter on the top of it. Any suggestions? Sorry to hijack.....

Joe

puppet · 07-14-2007, 10:37 AM

Well, here's the thing. The CC is supposed to separate oil and debris from the gases coming out of the VC before entering the engine. That's their whole purpose. That is why the CC should be the first component in the chain. Gases will have to go through that chamber first.

Your hook-ups will not utilize the CC until your in boost "and/if" the PCV valve is working correctly. That is to say if you have another draw on the VC while in boost. If not, you may as well remove the CC cause it's not even being used.

It shouldn't matter where or how it fits under the hood. The proper connections are just a matter of hose routing ... not so much CC placement. Well, within reason anyway. You wouldn't want the CC in the backseat if you get my drift :P Keeping the hoses large and short is the best.

**glhman** · 07-14-2007, 06:32 PM

I understand that, but that would just cause me to burn oil, and not to be blowing oil out the dipstick, filler, and rear main.

puppet · 07-14-2007, 08:20 PM

I didn't say it would ... just that you have it connected wrong.
(You asked "Is this correct?" in your first post.)

Gumpus · 07-14-2007, 11:06 PM

I think you may have bigger issues. I have had my pcv get stuck before, and it would not vent the crankcase. When that happened, the engine would make a "groaning" noise when the pressure built up, and would even push the engine over another crank or two when I turned the car off, but it never shot out oil. The only time that ever happened to me was when I put a hole in a piston.

**glhman** · 07-16-2007, 12:40 AM

Yeah, that's what I'm afraid of. I'm scared to do a compression test...

**glhman** · 07-23-2007, 02:55 PM

Ok, well I finally got the guts to do a compression test, and I'm happy. She has 120 across the board (may seem low to some, but I am at 1 mile of altitude). Next setup is re-re-double checking the PCV system

firebaron90 · 07-25-2007, 01:44 AM

GLHman,

is your catch can vented??? If it is, that is the issue. I had a vented catch can on mine. My issue was the vent did not allow a vacuum to occur, and my crank case pressure was building up in the VC during boost. I sealed my catch can, and checked for leaks, and the problem seems to have gone away.

Joe

**glhman** · 07-25-2007, 01:45 PM

My catch can is vented to the intake before the turbo. Not sure how it would work if it wasnt.