Hey guys, well, when I was inspecting the motor, I took off the throttle body plate and noticed the TB was fll of oil, coming in through this line from the pass side Valve cover, to the TB. I cleaned out my TB, and pt a breather on the valve cover. Should I put a breather on the end at the TB? Or simple block it off? Anyone have any ideas? I dont want to get oil in there again.

Thanks

WILL

 

Block it off. Thats a vacuum leak if I ever saw one without it being blocked off.

 

Snaps!!! Will do man! THanks, I figured, but I though I would make sure!

WILL

 

Mine, were blocked off... I figure that I am gonna go get 2 breathers. I have 2 holes in each valve cover.

 

Put the stock hose back on, replace your PCV valve, and clean the TB more often. If you have a MAF car, using a breather on the valve cover is creating a vacuum leak, since the PCV valve is hooked to a vacuum line on the manifold. I'm having this problem with my car now for the same reasons. If I pull the cap off the throttle body, it actually runs better because that air leak is similar enough to the amount being sucked in through the breather that it actually helps to make the mass air number more accurate. If your PCV valve is sticking it can cause crap to go up the tube to the throttle body, but if you don't have unusual amounts of blow-by, and your PCV valve is working ok, your throttle body should stay clean.

 

FYI, the breather will probably make your underside of the hood oily. I have it channeled to the TB like stock but clean it every year as part of routine maintenance. Besides, it is supposed to provide negative pressure for the crankcase.

 

I changed the PCV valve right after I bought the car, but it must have been fouled for quite some time to be causing all the oil to get into the TB, well ****, now I wasted money on a K&N breather, lol. I was thinking of fabricating some kind of in-line filter to catch excess oil before it reaches the TB? I will mess with that soon, but for now, i am gonna hook it all back up to stock. The new PCV should help out

Will

 

If you really wanna get fancy and efficient - run a hose from the PCV valve to the collector on the headers. Your piston rings dont block 100% of the air/fuel/exhaust mixture in your cylinders, everything that blows by your rings ends up in the crank case, what the PCV valve does, is let it all escape so you don't blow apart your motor - what GM did, was, like with the EGR recirculating unburnt stuff from the exhaust through the intake, is recirculate unburnt vapors from the crankcase through the throttle body's vacuum port. This was all an emissions thing, however, attaching it to your exhaust will gain u a coupla hp by not polluting your nice fresh air intake charge with unburnt vapors, and it'll relieve the crank case pressure via the vacuum created by exhaust gases passing through the headers.

 

how do I go about this bro??? I have an idea of what you are talking about, but I am more of a visual learner. Have a diagram or something? Thanks

Will

 

http://store.summitracing.com/partde...rt=MOR%2D68785

Just get a breather like those, weld a tube to the header collector, and run a hose from the breather to the tube.

 

That goop behind the throttle plates is caused about 90% by the EGR system, NOT THE PCV system!!

The stock hose that goes from the TB to the valve cover is the fresh air intake INTO the valve cover on that side. It takes air from IN FRONT OF THE THROTTLE PLATES. It cycles through the engine and collects oil vapors. It is then drawn back out and through the PCV valve back into the intake system.

The stock system is NOT an un-accounted-for vacuum leak! What is drawn from in front of the throttle plates through the fresh air hose is deposited right back into the intake through the PCV valve. The PCV valve is a KNOWN and CALIBRATED vacuum leak, basically, and the programming in the chip is designed with this in mind.

Run the PCV system just like the factory designed it. It works extremely well. There is very little you can do to "improve" it- and believe me, I've tried. make sure the valve is fresh and that the related hoses are not plugged up with crud or collapsed/soft from old age and long exposure to oil vapors.

If you run a functional EGR system then you simply have to clean out behind the throttle plates from time to time. No way around it.

 

The fact that the air is fed from in front of the throttle plates doesn't mean anything. The fact that it's fed from BEHIND the MAF means everything. All air going through the MAF is metered, including the air that is sent into the crankcase, and subsequently back into the intake manifold through the PCV valve. In its stock form it's not a vacuum leak because the air getting into the intake manifold through the PCV valve is air that was already metered by the MAF. If you remove that fresh air tube and just throw a breather on the valve cover instead, then you have a vacuum leak.