Was listening under the hood shortly after starting it up just now, and the pcv valve started rattling like crazy. I pulled the hose and the idle jumped up. If I try to reconnect while rnning it dies. Sucking large amounts of air through that little hole, never seen one suck that hard! What's goin on?

 

Just replace the PCV valve. A bad one can cause your truck to act really really funny. Don't get the valve from an auto parts store though. Get the OEM one from the dealer. It's only a couple dollars more and it works much much better. I bought a replacement one recently and it was I think $8 from the dealer.

 

Is this the part that plugs into drivers side valve cover? I got a replacement one but wasn't able to remove it. Will the rubber plug come out of the valve cover or only the plastic tube?

 

The grommet gets hard and brittle. Make sure you are removing the pcv valve not the plastic elbow that looks similar.


They swapped sides certain years. My 98 was on passenger side. It is which ever one goes to the manifold, not the air cleaner housing.

 

The PCV rattling at idle is telling you it is working....... it's supposed to do that. Now, trouble with the aftermarket fellers is, they do not have consistent flow rates, and can allow more airflow that is good for you engine. Gives you excessive oil consumption, and all the ills that come with it.

 

Pull the PCV valve when the engine is hot and it will come out without a fuss.

 

though it's likely nothing, it may be worth looking at..

the pcv relieves pressure in the crankcase.. that pressure is created primarily by blow-by- or air making it past the rings on your pistons.. if it's going nuts, it's likely a failing PCV, but it could also be indicating excessive and sudden blow-by..

you may want to consider a compression test. (I know, not likely- but why not?)