'165 Minimum Air Question...

[Bruce Plecan]

> so if i am getting this right, sounds like my throttle blades are to far
> closed.  so if i open the throttle blades up the CPU is going to close the
> IAC (reduce the counts).  but if i tweak the throttle blades the TPS is
> going to be off.

Yes.

> so set the IAC ST the Counts are down to say 15 & then
> re-adjust the TPS ST that TPS voltage is about .5 to .54 Vdc w/throttle
> closed.  (is there a personal pref on the TPS voltage @ idle?  i hear a
lot
> of preferences but have yet to have someone give me a reason for any of
> them)

Should check the shop manual, varies some by application.

> This is the starting point for the hardware (right after i check to ensure
> that i don't have any vacuum leaks & any other basic stuff that I ought
not
> miss before I start tinkering, you chuckling Bob V? hope so).
> now that i have the hardware set, the question is, is there any idle
> specific things to set for idle quality?

Yeppers,   just like any engine it has a sweet spot for timing and AFR

> I just checked my GME Pro & the only idle specific thing i see is the idle
> speed:temp table.  there is the VE table down @ the idle rpm/map setting.
> this also brings up a subject that we had not long ago about the idle cell
> being #4.

Ya know,  I have never paid a wit to cells, inna MAP system.   If you know
the K/Pa, and rpm then you know where you are, table wise.

I don't see idle cells anywhere in the editor.  will i be able
> to look up in the ANHT hac what columns/rows make up what idle cells?
>
> when i got the system there was not any instructions on the hardware & it
> has not come easy.  kind of sucks finding out 3 years later that the
stupid
> Throttle blades were set wrong.

NO, just your improving on things.
Some folks think a 1,200 rpm choke speed is fine,   I find it criminal.
Different strokes for different folks.

> what is the advantage to having the IAC counts "low" (Bruce you like them
@
> 0)?  if the car wants X amount of air & Y amount of fuel to idle @ 800
> (what my car is commanding @ temp), then what does it matter if the air
> comes through the TB or the IAC?  I bet it has to do with decelerating &
> other things that the cpu is going to control the iac for, but that is
just
> an ignorant guess, don't even know what other conditions are going to
> demand higher iac counts.

Think of this way.  The less corrections the ecm is making the closer the
engine's operation is, to what your foot is doing.   Once you have the fuel
and tming right and start getting anal about what good is and tinker with
the IAC stuff it will become clearer about what does whom
Bruce


>
> I know i am a bit long winded, (this on a day that there is good traffic
on
> the list), trying to get up on the learning curve here.  please note that
i
> am keeping all of the interesting correspondence (interesting as defined
by
> me).  I am going to try to put this back together in small chunks that can
> be posted on my web site  (or on DIY if worthy) for other newbies to learn
> from & for reference.  when that time comes i would appreciate some
> feedback from you old salts.
>
> as always thanks Mucho for the input
> Bob Wooten
>
>
> > [Original Message]
> > From: Bruce Plecan <nacelp at bright.net>
> > To: <gmecm at diy-efi.org>
> > Date: 2/14/01 5:25:47 AM
> > Subject: Re: '165 Minimum Air Question...
> >
> >
> > Min air, IAC counts are about a persoanl thing IMO
> > 99% of the time 10-20 is fine.
> > I like 0, in Drive.   And rpm varies by application (ie GN is 675 in
> Drive).
> > At 90 something sounds like your min is off, as compared to your
commanded
> > speed, and any cam change would affect this.   Actually at 90 sounds
like
> > you might be near anti-stall,  I don't remember ever seeing that large
of
> > number on a fully warmed engine, at idle.
> > Try setting the min idle to like 700, and commanded idle of 800 and see
> > where ya are.
> > Wholesale changes like this might bring on needing AE changes also.
> > I'd also, 3x the mechanics of things.
> > Bruce
> >
> >
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>
>
> --- Bob Wooten
> --- r71chevy at earthlink.net
> --- www.r71camaro.homestead.com
>
>
>
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