Originally Posted by Deadlyblade2k

Just did this on my 2011 ecoboost fx2. I pulled the CAC off today and there was a little tiny bit of yellow slime stuff at bottom of charge tube pit. I drilled a 1/16 hole as stated in very corner at lowest part and after a little drive im sure all of it came out cause it was all over the lower bracket that holes the CAC up. I didnt have any real problems with injestion but wanted to nip in the butt because im at 70k miles now and im sure its only gonna get worse if i didnt.

Originally Posted by leghost

Look at what comes out, through, the PCV of ALL engines so equipped, re-cycled back into the engine. Most cars have the PCV output vented directly to the intake manifold, downstream of the throttle wherein there is almost aways a vacuum as long as the engine is running.

BUT...

With a FI, Forced Induction, engine the intake manifold downstream of the throttle plate is often under POSITIVE pressure relative to the atmosphere..at EXACTLY those times the crankcase evacuation is most required, WOT, HIGH effective compression ratios = "high" blow-by.

So Ford, along with many other FI engine manufacturers, resorted to an old standy, a modified roadway draft tube.

Basically a tube with the opening at right angles to the vehicle's forward motion "windflow".....the airflow over the opening provides a "draft" effect, sucking the crankcase vapors out and into the atmosphere.

You cna readily see why this type of PCV system was abandoned years ago.

But...why not use the draft tube concept at the inlet airstream just downsream of the intake air filter??

The airflow into the intake, low or HIGH would create a draft effect right at the PCV outflow opening.

No complaints from the EPA..

Unless there is a low section of the intake system wherein moisture, condensate dripping down the discharge side of the CAC, might pool during times when the CAC outlet end cap is at atmospheric pressure, low to moderate intake airflow.