Is it a common problem? What to do?
Thanks.
When I open oil cap there is no blow by gas.

 

You shouldn't have any "gas" when opening the oil cap....it's not a sealed or pressurized system like the fuel tank.

There are two sides to the system: The left side (front) which opens freely into the intake before the throttle body. The other is the right side (rear) that utilizes the PCV valve and runs to the intake plenum. When the PCV valve is closed during throttle, the crank case gases are pulled out through the intake and no fresh air is entering. It is creating negative pressure. It's not vacuum as you would see off an intake, but air/gases are being drawn out and nothing allowing fresh air to enter elsewhere.

When at idle, the PCV is open and air/gases are being pulled in through the valve into the plenum. Fresh air (after the MAF, so not to be drawing in unmetered air) is pulled in through the front valve cover.

What to do? Just installing a good oil catch can will resolve oil getting into the manifold from the rear cover, which is the source. Get a GOOD can, not a $30 ebay paper weight. They tend to leak and are not usually user friendly (not easy to remove/empty). Go ahead and spend $60 or more on a good and trusted unit. Also, make sure the fittings are 5/8" to fit the rubber hoses.

 

[I]I have the same issue with my 2002 Maxima SE, I installed a pcv oil catcher to prevent the oil contaminating the intake. The problem is the tapered cylinder bore of the engine
Read this
http://forums.nicoclub.com/answers-o...c-t323273.html

Install this PCV oil catcher
http://www.jegs.com/i/JEGS+Performan...52205/10002/-1

Use 3/8 PCV tubing (not the fuel and transmission tubing), attached one end to the PCV valve to the IN of oil catcher. Another tubing, attached to the OUT of the oil catcher and attached the other end to the intake manifold.[/I]

 

I was thinking more along the lines of this.

http://www.summitracing.com/parts/mi...c-la/overview/

Holds significantly more, solid can so it won't leak, and won't be horrible to place.

Really, what ever you go with...just DON'T go ebay crap!

 

The engine of VQ35DE is really hot most specially in summer plus the high vaccuum might compressed the extended plastic tubing.
You better off getting this
http://www.jegs.com/i/JEGS+Performan...52206/10002/-1

 

I forgot to mention, rubber boot before throttle has lots of oil too!
I guess, it is coming from front valve cover, it is hard to believe that oil is going through PCV valve/ intake manifold/throttle against air flow. I checked compression, it is perfect.
2 and 4th spark spark plugs look oily.
I am thinking about installing separate air filter on hose front cover/rubber boot. I will plug boot hole and install filter on front cover hose.
Air coming through PCV valve will not affect MAF.
So far I bought new air filter, if old filter is clogged, negative pressure in rubber boot could suck oil from front cover. I need to check vacuum.
Thanks, guys, for your responses.

 

Oil in the sparkplug is different. It's leaking from sparkplug tube seal. For 2002-2003 maxima the sparkplug tube seal is attached to the valve cover. Replacement of the valve cover and valve cover gasket is a must. Use the 2004 valve cover. I believe for 2000-2001 maxima , you only need to replace the sparkplug tube seal.

 

Im getting white smoke and a misty oil out of my front valve cover, I have a small cone filter there like most super charged guys do. Could this white smoke be caused by blow by or a bad PCV valve? I also found oil in my manifold.. not a whole lot but a few table spoons.

Im planning on doing the catch can and a compression test to make sure its not blow by. I replaced the PCV valve to be safe.

 

You shouldn't vent the front vc of you aren't venting the rear also.

 

From what I know most SCrgd guys vent it with no issues. Also If I vented the rear wouldnt that eliminate the PCV valve altogether?

 

My understanding is that if you vent one and not the other it's considered unmetered air and basically a vacuum leak.

 

Hmm I don't know.. most guys just install a breather filter on the front cover
. And leave the PCV system as is.. some use a catch can which is what I want to do because of the oil getting in my manifold.. As for a Vacuum leak, I'm reading 18-22 on my boost gauge and my mevi works off the vacuum canister so I dont see how its a vacuum leak.

 

Just telling you what I've been told from several others.
Maybe someone will jump in and speak more about it.

 

Got ya.. Anyone care to enlighten me please feel free.

 

Yup, having a breather on only one VC causes a lean idle due to unmetered air entering, and so the rear also needs to be vented.

You can do one of two things, either drill your PCV valve out, so it's a 2 way, or, put a breather on there too.

http://forums.maxima.org/5th-generat...html?styleid=2

 

^thanks.