HOW-TO: PCV Leak Fix

[distinctdev]

PCV Leak Fix: Check Valve
After recent testing, it has been found that the stock PCV system may have a boost leak. To

eliminate this problem, a check valve is installed, inline, between the throttle body and the pcv

valve.

UPDATE:
If you are installing this mod, and already have a catch can, the check vavle should be placed between the Intake Manifold and the Catch can, with the direction of flow like the following

Catch Can ===== > Check Valve ===== > Intake Manofild

Parts Needed:

1 x Valve,Check,3/8 In (Part #5X781)
2 x Brass Hose Barb,3/8 In (Part #6X410)
Source: http://www.grainger.com
Gainger seems to only sell to businesses, if you have a local grainger store they may allow you to open up an account with them

or

1 x Brass Medium-Pressure Spring-Loaded Piston Check Valves (Part #7775K53)
1 x Push-On Brass Hose Fitting Barbed X Male for 3/8" Hose ID, 3/8" Pipe Size (Part #91465K93)
Source: http://www.mcmaster.com/


I recomend any brass check valve over a plastic one, you can see here how my plastic one warped from underhood heat.

Approximately 4ft of 3/8 In Hose
4 Zipties or 4 3/8 In Hose Clamps
Source: Local Auto Parts Store



Steps:
1) Buy the parts.
2) Pop walk outside, unlock your car (skip this step if car was previously unlocked), pop hood.
3) Disconnect both sides of the Stock PCV Plastic Hose.


4) Remove the Stock PCV Plastic Hose, This may be a little tricky but It can be done.
5) Roughly Measure how much of your new hose you need to cut.
6) Cut it in half and install the check valve inline.



7) Reconnect both ends so that the arrow on the check valve points towards the trottle body. You may hide the valve and hose behind the intake manifold for a clean look.

8) Install zipties/hoseclamps on the lines
9) Take the car for a drive, you most likely gained 1-2 psi of boost!
10) Enjoy

[wolf]

Although it looks pretty simple and easy, there is just something about it is not right. I think a check valk (one way) it ain't design to be there.

Any experts thoughts?

[thunder6g]

granger won't deal direct with customers/consumers??
I've been following the thread for this but was kinda waiting for someone to give a easy link to them directly- got any where else we can pick these up?

[SilverBullet]

I'm confused. Where does it actually leak? I'd figure, if anything, it would leak around the six connecting areas. Is the check valve there to prevent/help the PCV valve to deal with the "back pressure"?

[thunder6g]

there is about a 12-14 page thread on this issue in the performancemods section I think.

[SilverBullet]

hmmmmm...

[ojcool]

It's a scam! That valve is bronze not gold!!!!!!!!














Heh Heh.

[tURBOsetch]

Nothing wrong with adding the mcmaster valve. The stock PCV valve is a one way valve it just doesn't seal very well so it allows boost to blow by into the valve cover...You can tell if yours is leaking by looking in the air box where the little sponge is...If it has oil on it then your PCV is leaking boost.

[mdhavi18]

so does this mod completely eliminate the need for an oil catch can?

[RoostBoost]

subscribing for the best check valve to get.....grainger doesn't sell to the public...

[UNCsrt]

Quote: Originally Posted by mdhavi18

so does this mod completely eliminate the need for an oil catch can?

any thoughts on that?

[barrr]

Quote: Originally Posted by mdhavi18

so does this mod completely eliminate the need for an oil catch can?

No, they do two different things.

Catch can stops oil from getting into the intake.
Check valve stops boost getting to the valve cover.

[distinctdev]

updated

[SINYBlueSRT]

Ok, to clarify, "...You can tell if yours is leaking by looking in the air box where the little sponge is...If it has oil on it then your PCV is leaking boost." If so, then once you fix the boost leak, you should no longer be finding oil in the airbox. Right?

[01CBR929]

Hmmm guys... a PCV is, well... it stands for "positive crankcase ventilation". Not positive valve cover ventilation.