Pcv valve and tailpipe smoke
I am curious as to if a never changed PCV valve (2000 4.0 tj) can cause these things to ingest a little oil. I noticed after blipping the throttle a few times to 4K rpm (no load, wide open, full closed, wide open, full closed.. ) that i get a light amount of burned castrol gtx in the air. This alone dosent bother me, but I wonder if its possible that a 111K mile old PVC valve could be putting a little oil in the intake under very high vacuum.
I havent taken the valve out yet, my air filter and intake hose tube seem to be pretty clean, but the throttle body and inside of the intake is blackened with something that looks like soot, but the soot is dry, and the intake dosent seem to be wet fouled per se.
Im a firm believer that anythings possible, and if a bad PCV valve will vent some oil into the intake only under certain high vacuum conditions that perhaps that oil is completely sucked through and the intake dried out after the engine is shut off and cools down- hence leaving the dry soot inside.
I wonder if anyone else has noticed this or has any ideas. I never replaced my PCV valves or leaky valve cover grommets because I thought that PCV valves were a part of maintenance that could be neglected and a little oil on the valve cover dosent bother me. Apparently though through my readings online youre supposed to replace the valve itself every 15k?
anyone with similar experiences or recommendations?