Hi im trying to get a CCV valve, at least thats what im sure its called. I saw it in a Mitchell manual, Its on 89 firebirds and camaro TPI's. Its on the pass. side valve cover and has a vacuum line going from the valve to the throttle body. Anyone Know what Im talking about? and Is this the correct terminology for this valve? thanks,

I believe that's just a breather tube and is connected to the throttle body to make sure it gets air that has already gone thru the air filter (cleaner that way). At least that's what it is on my 91.....

Uh Huh,.....what he said!!!!!! CCV stands for Crank Case Ventilation. It is an open tube that fits in the passenger side valve cover with a hose or plastic tube running to the throttle body.

So then would it make a difference if i got 2 pcv valves? I work at a Chevy dealership and they cant find this valve at all!! Hopefully it will work with 2 pcv valves.

What they're trying to tell you is that it is NOT a valve.. It is the fresh air source for the PCV system (a tube running from the throttle body to the passenger side valve cover)... You DON'T want to put a PCV valve in there (that will just allow no air to enter). Find away to connect the hole on the valve cover to the hole on the throttle body (using a hose, the factory plastic tube or whatever). Alternatively, you could just put one of those little breather filters in the valve cover..

Do any of you guys think i will be able to purchase a CCV valve for this? and if so where can i get one?

I Know ive seen, something that goes there, and its not just a hose that goes in there. (at least i thought so) ive seen them on corvettes. Id rather get the hose that runs to that area from the Throttle body then put an air breather there, or is there really no difference at all between the air breather or the hose?

If you put a breather filter in the valve cover, will it not cause a leak at the TB? I had the breather filter on mine and a buddy of mine with a 95 Z told me that it would be best to put another PCV valve in there and run a hose to the TB.

Well, your friend doesn't know much about how a pcv system functions.. That port on the throttle body isn't a vacuum port, it is a fresh air port. I would plug it just so it is not open, but it isn't a vacuum port, it is a source of fresh and filtered air. A pcv valve would shut in that position and not allow any other air in (think about how a pcv valve is designed (it is designed to have vacuum on the hose end to pull the plunger up and allow air to be sucked up))...

Its just the difference between it drawing air from an independant little filter mounted on the valve cover, or drawing its fresh air from the air intake stream (and your regular air filter).

Thanks for your response. So your saying that a hose goes right to the valve cover? Theres nothing in between the hose and the valve cover? Thanks,

Nothing more than a hollow plastic elbow that allows you to connect the hose.

ok thanks again.

I want to purge the charcol canister on a '85 TPI... I have a diagram that shows the purge hose connecting to the pcv hose and going into the driver's side valve cover... I am wondering, since I have put the canister on the passenger side of the engine, can I just go into the ccv hose and go into the valve cover like the pcv? Aren't the two valve covers connected with the same air inside or are they sepatate? Don't quite understand the diverences...both are ventilator's... ???

As I said ; will work fine but you will fill crankcase up with petrol fumes before they are sucked out the Drv side cover

Air goes in one side and out the other ; hence the name Positive Crankcase Ventilation (PCV )
If both hoses were connected to a vac then you would have no airflow because there would be nowhere for air to get into system to allow air out at other end.
Put your mouth on the end of a soda bottle and suck;
what happens?

So the ccv side pulls fresh air out as it comes through the air cleaner and the pcv side pushes the air out of the crankcase and into the intake where it can go into the cylinders and get burned the rest of the way? This will eliminate the purge fumes going into the crankcase. They will go right into the TB. So the port where the pcv goes into the intake is a vacuum? This means I air cannot go into the crankcase on the pcv side because of that ball inside it? I believe I get it now...but where does the egr fit into it, doesn't it do what the pcv does, puts unburned gas fumes from the crankcase into the cylinders to burn the fumes the rest of the way...???
I will find a way to make the hose go around the back side of the engine and make it look clean.
And another thing: do you happen to know how often the canister purges itself...every couple minutes of driving? I know the ecm tells it to do this, but how does the ecm know...a timer or something or???
thanks vetteoz.

Wrong
Air goes from the TB to pass side cover , through the engine ,out PCV valve on Drv side cover to vac port at intake

EGR has nothing to do with CCV /PCV
It recirculates exhaust gas into engine to lower emissions; that is why it is called Emissions Gas Recirculation

https://www.thirdgen.org/forums/post...050-post2.html

EGR=Exhaust Gas Recirculation, CCV=Canister Control Valve. At least thats what Chiltons calls those things.

I hate to bring up this dinosaur thread but does anyone have a part name or number for the elbow that connects the hose to the valve cover? I'm pretty sure I have a vacuum leak there cause it freely moves around and I see an oil ring around the elbow

I dont have a part number but I had an Idea and it seemed to work great.

Cut off the end of an old PCV valve. Take out the plunger and spring. Voila.