12-16-2009, 11:52 AM
That tube looks to be providing the fresh air side of the PCV system. Fresh air from the intake tube into the crankcase, then sucked into a port aft of the TB (vacuum) to suck the air out.
Just above the oil fill cap there is another tube connected to the valve cover. Does that tube run to the back of the manifold (vacuum)?
If that tube your talking about is designed to pull air out I would say it does it through a combination of crankcase pressure pushing and a venturi effect of air rushing past the opening, not vacuum in the intake tube.
I just don't see how a MAF with an opening 2.5 in circumference could force a vacuum between it and a blocked, smaller passageway (TB with blade 99.9% of the time more closed than open) The MAF has to flow more than the TB to work properly.
Just above the oil fill cap there is another tube connected to the valve cover. Does that tube run to the back of the manifold (vacuum)?
If that tube your talking about is designed to pull air out I would say it does it through a combination of crankcase pressure pushing and a venturi effect of air rushing past the opening, not vacuum in the intake tube.
I just don't see how a MAF with an opening 2.5 in circumference could force a vacuum between it and a blocked, smaller passageway (TB with blade 99.9% of the time more closed than open) The MAF has to flow more than the TB to work properly.
Current: 1985 LS1 Corvette | 2014 328i Wagon F31
Former: 2010 Ford Edge | 1999 Integra GS
I have a little bit of a rub near lock but if you are turned to lock on a track there are other problems already...
Former: 2010 Ford Edge | 1999 Integra GS
I have a little bit of a rub near lock but if you are turned to lock on a track there are other problems already...