PCV Valves

[nevermind65]

Thanks for all the replies.

I found a PCV valve lying around from a 5.0 liter. I swapped it out with the one I bought from Autozone. Seemed to do the trick. The one from Autozone, that I just randomly grabbed off the shelf, had a huge orfice. My guess is that it was allowing too much vacuum to be lost. I guess there is a reason they have 50 different variations.

I believe there is no valve per se in the PCV valve. Basically it is always "on" as long as your engine has either vacuum, or pressure in the engine. The rattling you hear does nothing but act as a one way valve so if you should encounter a backfire and an open flame is present, it will not allow the flame to travel into the engine where oil mist is present causing an even larger fire. That is what I was told many years ago anyhow. Maybe the valves for newer cars have something different in them?

Thank you!

[PaulProe]

has anyone found a site that lists the parameters of the different PCV valves and how to select one?

The outside-physical shape is one thing. Once you've found the correct configuration, there still are 20 different valves to chose from.

I've looked all over the internet and manufacturers site but no luck. Surely there is a site somewhere that outlines the valve selection process

Paul