The Crankcase vent system is not really controlled. Any flow thruogh the breather is after the AFM and therefore not compensated except for the O2 sensor.  Any leaks including cracked valve cover gaskets are a problem.

Dennis

----- Original Message -----
From: Larry Alofs <lalofs@RCN.COM>
Date: Thursday, March 16, 2006 12:24 pm
Subject: Re: Chunka Bologna

> Can someone explain why a vacuum leak into the crankcase can affect
> drivability?
>  I thought that the crankcase ventilation system had some type of
> orifice to control the amount of air that goes into the intake by that
> route.
>
> Larry A.
>
>
> Mike Collum wrote:
>
> > Without a good O-Ring where the dipstick tube goes into the
> case, and/or
> > a good rubber seal where the dipstick enters the tube, you can
> have a
> > vacuum leak which would cause driveability issues.
> >
> > I even found on my '84 that the oil fill tube had a bad seal
> where the
> > plastic part attaches to the metal part that caused poor running.
> >
> >
> > Mike
> >
> >
> >
> > Roger Sisler wrote:
> >
> >> I got a lifetime  suply of 0-rings. Can I pull the tube out and
> >> replace the
> >> ring? What if the rings I have dont fit. Can  I just press the tube
> >> back in?
> >>
> >
>