PCV Valve bad right?

[nfernotalon]

Ok i just took it out of my valve cover and when i blow air through it and out of it air goes through no matter which way, pcv is bad right? thanx

 

[nube90]

Indeed it is... air is only suppose to go out one way.

 

[nfernotalon]

Thanx, i also heard oem ones are no good? Is this true?

 

[NN4S]

Thanx, i also heard oem ones are no good? Is this true?

Can't say I've ever heard that; folks just don't generally want to pay more than a few bucks for a replacement part. It's a simple enough part that is hard to screw up, so it's very likely that any one you pick up from a parts store will work. The usual fail mode is that you can't blow through it in either direction; a good cleaning is all that's needed in those cases to get it working again.

 

[nfernotalon]

Thanx, Im gonna go pick one up right now.

 

[PieEyedPiper]

Can't say I've ever heard that; folks just don't generally want to pay more than a few bucks for a replacement part. It's a simple enough part that is hard to screw up, so it's very likely that any one you pick up from a parts store will work. The usual fail mode is that you can't blow through it in either direction; a good cleaning is all that's needed in those cases to get it working again.

I've definitely heard it and if you search around you'll find the same.
It is a seemingly simple part, but maybe, that is why it is so often screwed up.
Units from random parts stores are the worst you can get, they all leak right away. Find me one that doesn't, and then find me one more.
The units from the dealership are the only half reliable valves, but better than parts stores. But even when you get your $4-$8 PCV valve from the dealer check it right there to make sure it doesn't leak. If it does, ask the parts person for another.

Check out this thread for some good info.
http://www.dsmtuners.com/forums/newbie-forum/229338-stupid-pcv-question.html
I, myself, have invested in a check valve between the intake manifold and a pcv so even if my pcv valve leaks it still operates as intended; limiting airflow into the intake and blocking all air entering the valve cover.

 

[kenamond]

I disagree with just about everything NN4S said. And I agree completely with what PieEyedPiper said.

You should be able to blow through the valve from the brass "snorkel" threaded end but not from the end the vaccuum line barb is. The Autozone and Carquest ones look identical to the OEM ones, but they'll leak air in both directions.

 

[nfernotalon]

So i just bought one from auto zone and it does the same thing, it leaks both ways!!

 

[nfernotalon]

What can i do?

 

[snowborder714]

I've always read to get the OEM PCV valve as the others always leak both ways.

Just get an OEM one. Part number - MD024719. And they're $4.85 from Mitsubishiparts.com - Find a Item.

Edit: Please don't bump your own thread.

 

[kenamond]

What can i do?

Take the Autozone one back for a refund.

Get an OEM PCV valve. If there's a DSM shop or dealer (Mitsu) in your area, call and ask for a PCV valve (they may have to order it). Or you can order it online. Mine cost $8 at a Mitsu dealership.

Read what PieEyedPiper posted to find out a way to fix the PCV valve issue for good. They wear out fairly quickly. That's one good reason to boost leak test at every oil change.

 

[snowborder714]

You could also just put a cheap check valve in the hose from the PCV valve to the intake manifold.

Here's a cheap one that'll do the job:

Liquid/Gas Check Valves - US Plastic Corporation

(I just ordered a few of them myself.)

 

[NN4S]

I disagree with just about everything NN4S said. And I agree completely with what PieEyedPiper said.

You should be able to blow through the valve from the brass "snorkel" threaded end but not from the end the vaccuum line barb is. The Autozone and Carquest ones look identical to the OEM ones, but they'll leak air in both directions.

I guess I've been lucky, then, because I have yet to get one that I couldn't clean out and use again. Not wanting to give any bad advice, just my experience with cars in general and DSMs in particular over the last four years. Anyway, given the comments from PieEyedPiper & kenamond, it seems that even Mitsu's units are suspect.

I'll certainly keep that in mind when I do finally have to buy a new one; for now I'll just continue tossing them in the ultrasonic cleaner with some fresh diesel fuel since it seems to be working for me.