'165 Minimum Air Question...

[Shannen Durphey]

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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