Re: [DML] "False Air" = "Vacuum Leak"

["content22207" <brobertson@xxxx>]

Nope. Air passes over sensor plate, under fuel distributor, then thru
cold start tube. Idle speed motor bypasses throttle plates (and the
built in manual idle speed circuit -- sorry, couldn't resist).
Basically serves same function as variably cracking throttle plates. 

Only unmetered air is (should be) PCV. Contemporary engines obviously
designed for it. If you disconnect (or if your PCV valve stops working
on a car so equipped), performance and fuel economy will go down.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, Jim Strickland <ihaveanaccount@xxxx>
wrote:
> What about the idle speed regulator? Doesn't it add air that isn't
> measured by the air sensor plate?
> 
> Jim
> 
> 
> On Sat, 19 Apr 2003 03:58:24 -0000 "content22207"
> <brobertson@xxxx> writes:
> > Another term for "false air" is "vacuum leak". With the exception of
> > PCV, *EVERY* ounce of air that enters your engine should pass over
> > (and activate) the air sensor plate. Is the only way to meter fuel.
> > Any air entering via injector seals, bad hoses, old O rings or
> > gaskets, etc will throw fuel/air mixture off. Is often much more 
> > than
> > minor inconvenience: impossible idle, poor acceleration, excessive
> > fuel consumption, dirty combustion (how many times do problems like
> > these crop up on list?). Can not stress enough importance of 
> > ensuring
> > entire upper half of engine is air tight. Good news: is easily 
> > within
> > capabilities of every owner to at least isolate a leak. Just don't
> > take any seals for granted on a 22 year old block...
> > 
> > Bill Robertson
> > #5939
> 
> 
> ________________________________________________________________
> The best thing to hit the internet in years - Juno SpeedBand!
> Surf the web up to FIVE TIMES FASTER!
> Only $14.95/ month - visit www.juno.com to sign up today!