Re: "False Air" = "Vacuum Leak"

["David Teitelbaum" <jtrealty@xxxx>]

You ask a very good question, Where does the air come from for the
idle speed motor? A quick look at the picture on D:05:01 gives a
simple answer. The idle speed motor bypasses the THROTTLE PLATES not
the air sensor. An air leak in this circuit not only upsets the air
fuel ratio but also causes a loss of speed control by the idle circuit
and the throttle plates. This is a very important reason the air tube
going into the mixture unit underneath must not leak at the "O" ring
seal. If there are no vacuum leaks then all of the air the idle system
gets is measured by the air sensor plate.
David Teitelbaum
vin 10757



--- 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
> 
> 
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