I’ll try that but that’s gonna have to wait til next week. Have to get my tag for my car renewed and I have to buy the vacuum gauge tester. But I’ll try that as soon as possible

 

Ok we will still be here.

 

Alrighty thank you very much for the advice

 

What's clogged up here is not either one of the crankcase ventilation tubes. You need to put a new Air Filter in there, or clear the rats nest out of the intake plenum.


There is no valve in the PVC system. It just constantly draws a constant volume through the crankcase. The Vacuum side plugs directly into the IM, subjected to ALL the vacuum in the belly of the IM. No valve there. It's 'heated' there if Outside temp < 35 degrees. @MontanaMark is correct, the PCV air source is from 'filtered' and 'metered' air from the passenger side of the TB Air Box. If the engine can't draw air into the manifold via the air intake plenum (Clogged Filter), it would suck like hell from the ONLY OTHER SOURCE from which it can get any air - THE CRANKCASE.

 

The air filter was dirty however I took out of the air filter out and the truck still ran the same. I took the throttle body off and looked into the manifold and everything looked clean. However I did find a lot of oil and gas inside of the manifold catch bowl thing? But for the most part everything you said sounds right except for the pcv not having a valve. The driver side and the passenger side has a valve but they’re bout working properly. Um I’ll check the intake manifold better and see what I can find. The mass airflow sensor read normal on the Obd-2 and whenever I put my hand to the intake the truck wanted to die. My friend keeps telling me piston rings however piston rings would cause air to be pushed out right?

 

How about the intake manifold? Cracked/broken at the bottom?

 

Yes bad rings would create pressure in the crankcase. Try blocking the air flow to the PVC valve and see what happens. That will let you know whether or not this is causing the excess vacuum in the crankcase.

 

is this something special on flex fuel ? I have heard of adding one in pcv system to collect oil from going back to intake . Is this factory or aftermarket .I would suspect passenger side pcv line on wrong port on intake . Possibly on iwe port for 4 wheel drive vacuum .very interesting problem

 

This is an interesting problem,

But Guys - The butterfly in the TB is the restriction that creates the pressure differential between Atmospheric pressure and IM belly. Atmospheric pressure in the Air Box, intake valves sucking air on the intake manifold side. Air flow from the air box trying to equalize negative pressure in the IM belly is available from only two sources. The PCV system through the crankcase into the IM belly and the intake port on drivers side --- AND --- the intake air plenum.

Air flows naturally and freely into the intake manifold from both those two sources (air plenum with a portion routed through crankcase) all the time. The only thing that would increase or decrease the amount of air flow in one path over the other would be a restriction in the opposite path. (PCV system <-> Air plenum).


At the ripe ole age of 71, if I've learned anything, it is certainly that there is room for me to learn something else from anyone. And @Robert.R is poised to prove that once again. But I know of no 'valve' on either side of the PCV system air tubes (for purpose of altering air flow). Catch can excepted, I can think of no functional advantage to putting any valve (limiting the amount of fresh air routed through the 'air-tight' sealed crankcase). The electrical connection on the Drivers side is an electrical heater to heat the air. It's sole purpose is to prevent humid air from FREEZING and causing failure of the PVC system. Otherwise, as the air traverses the pressure differential between atmospheric and intake vacuum, the rapid drop in pressure would cause ice buildup - plugging up the PVC path.

If an excess amount of air is being drawn in through crankcase (or 'into' with Oil filler cap off), it has to be the result of restricted air flow through the other path - (Air filter &or air plenum.)

ALSO - Is there some level of crankcase ventilation that would be considered TOO much?? It is air that has been filtered by the filter and metered by the MAF.

Just an ole shadetree mechanic's thoughts. I could be wrong.

 

To all here in this forum I really appricate all the thoughts and ideas of what it could be. Everything sounds dead on to what I was believing also and to clarify on everything I have done and tested. I have disconnected both pcv hoses and closed the the ports that suck the air in and had my brother try open the oil cap and he barely could like usual. The crankcase is sucking so much air that it is nearly impossible to take the cap off. You literally have to pry on the oil cap in order for it to come off. Whenever it does come off the engine stalls immediatly. Now i do believe the truck has piston ring problems, however, from my knowledge I do believe that air would be pushing out instead of sucking in correct? 🤔 I’ve check the manifold for leaks and cracks but couldn’t find anything. Now the intake manifold doesn’t even sound like it’s sucking air into the engine. The pcv system seems to be the only thing sucking air. Now I did check the manifold and it was clean, no debris. The engine has no knocking or abnormal sound. Camshaft looks spectacular. Maybe I can post a video and link it to y’all so y’all can see