weird o2 sensor readings? (mc'd urq)

[JShadzi at aol.com]

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[ Picked text/plain from multipart/alternative ]
Mike, this isn't necessarily true, the condition Todd is having trouble with
doesn't have to do with the main, steady state fueling of the engine, this
area is referred to as "acceleration enrichment".  For example, in the 034efi ECU
we had to add a seperate configuration parameter for acceleration enrichment
becuase of the sudden fuel need a motor has upon initial acceleration, or when
the throttle body is rapidly opened.  So this is supplemental fuel on top of
what was already going into the motor based on its fuel need right before the
acceleration event.  Typically about a 10% increase in duty cylcle for about
1/2 second or so will ensure smooth, hickup free transition to acceleration.

I've read that the CIS systems dealt with this mechanically (duh), that upon
sudden acceleration, the inertia of the air plate will carry it slightly above
the position dictated by air flow, so when the throttle is rapidly opened,
and the initial rush of air to the motor happens, the plate will swing up and up
a little higher to add this extra amount of fuel.  Someone correct me if I'm
wrong, but I believe I read this in the Probst book, been a while tho.

Not sure what could be causing Todd's problem as he says he's swapped in
different meters to no avail.  All this accel. enrichment would have to happed
before the WOT switch is ever engaged.

Javad

In a message dated 7/10/2003 6:55:09 PM Pacific Standard Time,
mike at borderlinemotorsports.com writes:

> the only thing i'd say to this is that the actual flow of gas is
> going to be proportional to the amount of air coming in through the
> plate, not the throttle body...  there will be a drop in pressure (or
> increase of vacuum) for a split second until the air fills the gap
> there, but that would create a temporary rich-running condition, imo,
> if anything...