bad pcv valve?

[Wickedracer84]

can a bad pcv valve kill your cars performance?

 

[spoolup]

I have never seen it, but lets say the valve allows air to pass thru BOTH directions. Well then you have a huge boost leak since the pressurizied air will enter your valve cover then exit out the breather on the side of the cover and into the intake or the catch can. Easy to tell if yours is bad. Pull it out. and shake it, should hear a little rattle, then blow IN TO the threaded side,should allow air to pass, then try blowing into the barbed side, air should not flow. Should take a good 30 seconds to test.

 

[FourG63 97GST]

Your PCV valve shold be hooked up in front of the turbo, right behind the mass air meter. The purpose is to let excessive crankcase pressure out. You should never have a pressurized line on the front of the PCV valve. Having one stuck is not a good thing but it won't kill performance. For $4.99 I change mine like once every 6-8 months.

you're thinking the charcoal or breather.
the pcv on the firewall side on the valve cover w/ a hose going to the intake manifold

 

[oldman]

can a bad pcv valve kill your cars performance?

Yes it can. Crankcase ventilation is crucial to our system, a stuck open or closed pcv will decrease crankcase ventilation capacity causing excessive crankcase pressure, one of the top reasons for turbo seal and valve seal failures if left un-treated.

 

[91gsxboosted]

It sure can^^ like he said. to check it take it off and see if you can blow through it on both sides. It should be fairly easy to blow throiugh. If you dont feel like doing that go buy a new one they are like 3 bucks

 

[DGajre777]

If you have a Autozone near you it is part # PCV144 and it costs $3.99.

 

[Wickedracer84]

replace my pvc today everything seems to be working well didnt feel like test driving tonight but anyways thanks guys

and the part number at oreiliy autoparts was like 266

 

[steve]

But make sure to test it with at least boost pressure applied to the barb before installing it.
Anything that leaks out is just as bad as a boost leak the same size in your intake manifold. Worse actually since a "normal" boost leak doesn't try and pressurize the crankcase or blow oil into your intake.

Don't be too upset if you have to buy a few before you find one that actually seals at 15-20psi

Steve

 

[oldman]

Don't be too upset if you have to buy a few before you find one that actually seals at 15-20psi

Especially if it's not an OEM piece.

 

[DGajre777]

This might be a stupid question, but if I blow in the PCV valve to check it, how much PSI of air am I pushing through it?

 

[oldman]

This might be a stupid question, but if I blow in the PCV valve to check it, how much PSI of air am I pushing through it?

Minimum to your boosting level.

 

[steve]

if I blow in the PCV valve to check it, how much PSI of air am I pushing through it?

Put the tire gauge or the hose from your boost gauge in your mouth and measure it. I'd be surprised if you can push more than a few PSI which is why you have to use compressed air to test them. If they leak when you blow into them they should go directly to the circular file.

Steve

 

[DGajre777]

Put the tire gauge or the hose from your boost gauge in your mouth and measure it. I'd be surprised if you can push more than a few PSI which is why you have to use compressed air to test them. If they leak when you blow into them they should go directly to the circular file.

Steve

That's what I was looking for. So basically if it can't hold a few PSIs that I blow from my mouth, it won't be able to hold 20 psi from the engine. Thanks!

 

[Wickedracer84]

ive tryed blowing through both ends of the pcv valve i can fell air going out the opposite side of it when i blow through the vaccum hose side. but i know my breath wont even create 1 psi when i blow on my boost guage line. does it have to be under more pressure to seal from the vaccum hose side or what?


im refering to the new pcv

 

[oldman]

ive tryed blowing through both ends of the pcv valve i can fell air going out the opposite side of it when i blow through the vaccum hose side. but i know my breath wont even create 1 psi when i blow on my boost guage line. does it have to be under more pressure to seal from the vaccum hose side or what?


im refering to the new pcv

Here you go.

If they leak when you blow into them they should go directly to the circular file.

 

[Wickedracer84]

circular file?

 

[steve]

circular file?

Maybe they call them something else in Texas but that's one way to refer to the wastebasket/trash can.

Steve