'165 Minimum Air Question...

[Dan Townsend]

> 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.
> 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)

If you set the min. air then the computer will use the IAC to try to get the
desired rpm.  This will happen regardless.  The TPS needs to be .54 +/- .075
I personally use .54-.55 but maybe closer to .60 would give better throttle
response since as soon as the gas moves it would start uping the % of
throttle.  Not that picky yet :-)

> 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?

I usually forget to reconnect the brake booster after removing the plenum
and am greated with 1200+ rpm idle.  Usually it is pretty obvious.  Get a
can of B-12 carb cleaner and spray all around the intake.  If the idle goes
crazy you've got a vacuum leak.  Getting the O2's to swing and BLM to stay
at 128 would be my first goal.

> 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.  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?

I don't recall seeing anything like that in the hac which I look at on a
daily basis.  If I am correct the cells are load and condition based.  Not
much to change.  That is why the VE table is there.

> 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.

It should be part of the tune-up when you buy a car.  My TPI car is my first
car and I couldn't do anything to the car when I got it just over 3 years
ago and now I can pull the tranny and take it apart and put it back
together.

> 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 it has more to do with the idea that IAC is a vacuum leak.  I'm sure
Bruce will have that somewhere is his answer since it is in the tuning tips
:-)

> 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.

What about us young-un's we can stab at it too.

DanT - Know I will have worded something wrong :-)

> 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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