'165 Minimum Air Question...

[Bob Wooten]

With the car sitting in @ the starting line waiting for the other guy to
dry hop my car was sitting @ 201 coolant temp, 160 MAT, & a IAC count of
93.  would you consider this high?  i checked a number of runs (street
mostly) & it appears from looking @ the scaling that this is a 256 count
full scale & I don't think that i ever saw it get higher than 130 or so (a
peak not average).  this leads me to think that it has a way to go before
it runs out of room. the amount of flow through the IAC is non linear in
relation to the count though is it not?  maybe 93 is a ton?  

Thanks
BW 


> [Original Message]
> From: Shannen Durphey <Shannen at grolen.com>
> To: <gmecm at diy-efi.org>
> Date: 2/13/01 10:14:06 PM
> Subject: Re: '165 Minimum Air Question...
>
> Bob Wooten wrote:
> > 
> > what would you use as a minimum setting (using counts)? 
> Kinda depends, but I like to see 45-60 or so on the scantool.  T
> 
> > by poor idle
> > control you mean that it might surge & pretend that it wants to die
when it
> > is just sitting there idling or when coming to a firm stop (firm stop is
> > kind of like spirited driving only acceleration in the other direction).
> Anything like spirited not driving?
> Poor idle control is stalling as soon as it's put into gear, and/or
stalling at
> stops, and/or low idle speeds, and/or no A/C compensation, and/or
sometimes no idle
> speed flare on startup
> > 
> > TIA
> > BW
> > 
> > > [Original Message]
> > > From: Shannen Durphey <Shannen at grolen.com>
> > > To: <gmecm at diy-efi.org>
> > > Date: 2/13/01 9:19:07 PM
> > > Subject: Re: '165 Minimum Air Question...
> > >
> > > Like Dan suggested, you need to ensure that the IAC is fully closed
and
> > not under
> > > ecm control when setting minimum air.  Minumum air settings are a bit
of a
> > > balancing act, IMO.  I like to use IAC counts as a reference for
correct
> > throttle
> > > position.  IAC counts will depend on minimum air, timing, tps
adjustment,
> > and fuel
> > > delivery values.  The farther you are from stock, the more these
factors
> > change
> > > from stock settings, and the more room you'll have to make mistakes.
> > However...
> > > Do not close the throttle plates completely.  You can often run the
> > engine 'till
> > > warm, back off the throttle stop screw completely, turn the screw
back up
> > until the
> > > throttle lever arm just makes contact with the screw, then go an
> > additional 1/2 to
> > > 1 turn.  Again, I like to check the IAC counts as a reference.  Once
the
> > throttle
> > > stop is set, leave it alone.  There may be occasions where you need to
> > adjust it,
> > > but think of it as the last item on the list to change.
> > >
> > > One question:  Did the car work with this minimum air setting at all?
> > TPI engines
> > > seem to "use up" IAC motors more often than other systems.  One of the
> > signs of a
> > > faulty IAC is poor idle control when the engine is warm.
> > >
> > > Shannen
> > > OneSS2NV at aol.com wrote:
> > > >
> > > > Hello all,
> > > >    I was curious if anyone can give some tips on setting the Minimum
> > Air for
> > > > an '87 '165 F-body?  The spec given is 450 rpms, but it seems too
low.
> > I
> > > > have it set there, and when I shift from Park or Drive into Reverse,
> > the RPMs
> > > > drop too low and the car stalls.
> > > >    The motor is a 305 with a mild Crane 2031 roller cam and World
> > Products
> > > > Heads (basically stock, with 1.94/1.50 valves), so should I assume
that
> > it
> > > > needs a bit more RPM to keep the computer happy?  Is this a case of
> > "give the
> > > > car what it wants, not what the book says?"
> > > >
> > > >       Thanks in advance,
> > > >          Steve Ragusa
> > > >           North Jersey
> > > > '85 Monte SS with '87 F-body TPI
> > > >         '96 Impala SS
> > > >    www.bowtiepower.com
> > > >
> >
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> > 
> > --- Bob Wooten
> > --- r71chevy at earthlink.net
> > --- www.r71camaro.homestead.com
> > 
> >
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--- Bob Wooten
--- r71chevy at earthlink.net
--- www.r71camaro.homestead.com



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