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Probably should have started a new thread...
Anyway PCV - Positive Crankcase Ventilation. Basically the crankcase emissions have to go somewhere so instead of letting them into the atmosphere they go back into the intake manifold.
I don't see how the car would tun worse by replacing the valve, perhaps the symptoms could be described. It could be a conincidence that something else went bad when you changed the PCV valve. The hose which connects the top of the valve cover to the intake manifold could also have a hole in it or be blocked. It should be replaced at the same time you replace the PCV valve.

By the way I do believe worser is not a word :D
 
Car is making a bogging noise when coasting...

Just rescently my car is starting to make a boggind noise al most a sputter in the noise of the exhaust. what could be the problem? only thing i have not replaced during tune-up is PCV. What are the affects of a bad PCV valve?

1990 2-door Legend 5-speed
237,000 miles
 
Just disconnect the hose from the manifold. With your thumb over the end of the opening block it, open it up, partially block it and you will be able to replicate the problems a broken or stuck/blocked PCV valve would cause.
 
Your car should completely die if you remove hte hose from the PCV valve/valve cover.
 
jeffokada81 said:
Question, how do you know if your PCV is going bad?
Physically, you should hear and feel the ball inside the PCV valve moving freely as you shake it.

jeffokada81 said:
What are the affects of a bad PCV valve?
Gives out high emissions levels.
 
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