Thread: How can oil get in plenum?

The car was bought jus a few months ago and everything seem good. Then it started to smoke a little out the exhaust on start up. Didn't think much of it because I thought valve seals. Started doin it more and more and didn't quit after start up. I started taking it apart, oil was setting on top of the valves waiting to be dumped in the chamber. Also when I unplug the PCV oil come out of the plenum. I was reading up on it and i keep coming to valve seals or rings.. I could see valve seals leaking but to put that much oil on the valves seem unlikely. Something about if the rings was worn they could let compression pass the piston therefore pushing oil through the PCV into intake?

I will try a new one. I thought mostly air pressure went threw that..If so much is goin threw it wouldnt that be a problem?

I do needa check them bolts..you are referring to the lower intake right?

Originally Posted by 98L36

I'd try a new PCV first, my car (even with the 3.8) had a bad PCV valve that was giving me all kinds of little mysterious problems.

Originally, I thought you had a 3.8, but FFDP pointed it out that you have a 3.4. I'm not so sure that your 3.4 has the bolts down inside of the lower intake like a 3.8 does, but it was my fault for not knowing you were talking about a 3.4 and thus throwing you off. I'm not sure if the intake on a 3.4 is built similarly to a 3.8 or not, sorry about that.

I'd just try a new PCV before you go taking other things apart, a new one solved some issues for me and was fairly cheap at the parts store.

There are two of them if i remember right.. i rebuilt the engine last winter so im not 100% sure... though the fact they havent responded in awhile tells me the pcv most likely worked.