Catch Can N/A VQ37VHR Burning Oil/Smoke

Printermeow

Greetings and thank you everyone for reply!

I ran into a problem, I had open breathers for over a year but the smell of fuel became unbearable and I decided to go with recirculating (non vented) catch cans to "close the loop and make it factory like" and thus eliminate smell.

Setting up like in example photos from catch can manufacturer I get severe smoking from exhaust like a chimney with intake breathers connected from crankcase to intakes as in photo but without baffles. Also within seconds had about half cup full of oil in both of my catch cans.




Setting up with closed off intake and manifold breathers it doesn't smoke but I am very fearful of pushing the car because I have done something wrong with tubing from/to catch cans.







Please help me out guys, thank you.

Rusty

I'm wondering if you have your hoses on the cans backwards. Or you got cheap azz cans that just suck. Where did you get the cans from?

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jchammond

This was to be next on my list & there are a variety of cans,videos & reviews.
Be sure & put new pcv valves in & you may have to remove upper plenum, to clean oily residue. Can is T’d in from pcv to plenum inlet (you appear to have it proper).
Inlet port from pcv should have an internal pipe,that goes down into some type of media (steel wool etc.) & outlet just gets clean vapors from near top of can.
Some have drain valves on bottom & some with screw on bottoms.....just be sure your pcv valves are good & you don’t just have nipples in grommets...or it will be sucking a lot up through system.

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Quicksilvers

The last time I seen a smoke show like this from oil catch cans installed was from a 1998 Chevrolet Camaro SS LS1 and the owner failed to change his dirty PVC valves and also routed the lines wrong but he could remember to trim his mullet though. I am wondering what brand oil catch can did you install? Also double check your lines and make sure they are routed correctly. Install new PCV valves if you have not already. I see mostly people with forced induction Z’s running oil catch cans not people with naturally aspirated Z’s.

Elmo370z

This is how I routed my lines. I plugged off the two ports coming off the manifold.

Attached Images

6BD40F4E-1A84-4C10-93A7-4B483B25A4DF.jpeg (275.6 KB, 92 views)

Printermeow

Cans are genuine mishimoto and hoses are in the correct way as per many others installing same kind of cans. I removed them and reverted back to open filter from front crank case ports and there is no smoke and also no severe suction within the crankcase like in the picture attached, engine working the nipple is sucked in as in picture when I had cans installed

Cyber370

Why the catch cans, OP? Was it smoking or where you burning oil prior to the catch can installation?

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Quicksilvers

It was smoking the same situation as the OP.

sirnixalot

It looks like you've deleted the PCV valves as I see AN fittings on the valve cover. If that's the case all you are doing is pressurizing the crankcase (under boost). If that happens you end up forcing oil past the rings.

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projectpanda

I know this is an old thread but wanted to share my similar experience. The rear ports on the valve cover needs to be able to breathe, so DO NOT CAP. I made this mistake and after 60 miles of high rev driving, my oil pressure light came on and when I checked my dipstick, there was so much vacuum it pulled the stick back down
My setup that caused this was capping off the rear ports but kepted the pcv port stock. I didn’t have a filter to put over the rear port but I still left it open to breathe and it was fine afterwards.

I have since drilled into my intake to mimic the factory setup with an oil catch can on the pcv side.

Jonathan-NEX

Hey I know this is an old post, but I am having the same issue with my set up. i installed the catch can the same way you did, and I forgot to open the backside valve covers causing pressure to build up and the same thing would happen when I would open the oil dipstick. I proceeded to add hoses with little filter breathers attached at the end, and that got rid of the oil pressure problem, but then I received a code P0171, running lean on bank 1, what do you think I may be doing wrong?

Here are pictures of my current set up

Attached Files

Document.pdf (369.4 KB, 6 views)

ByThaBay

You're pulling in unmetered air through the breathers. Your fresh air intake has to be taken AFTER the maf sensor meters the air. If you take in air from a breather, that's "unmetered" air going directly into the manifold.

breather -> valve cover -> pcv valve -> intake manifold = vacuum leak

Jonathan-NEX

How can I fix that problem, and thank you for replying!

ByThaBay

Get rid of the breathers and connect the hose to an air source after the maf but before any forced induction or throttle.

Jonathan-NEX

Since my intakes do not include the hole to connect the valve cover to, where should I get the air source from?