TheReaper

I'm trying to find out what the symptoms of a bad PCV valve on these would be symptoms I've been having driving down the road I will hear a hissing sound and have a loss of power during the hissing the hissing goes away power comes back the hissing sound is coming from the driver side doesn't do it at idle only does it while driving down the road you can also hear a hissing sound when the vehicle is shut off it is not AC compressor during the hissing sound when I lose power it has a very throaty sound almost like bogging down any help would be appreciated already went through the vacuum system no leaks is there a way of testing these I know they're built into the valve cover just not sure if there's a way to test them