Min throttle plate opening & IAC

[Bruce Plecan]

-----Original Message-----
From: T Hergen <thergen at svn.net>
To: DIY_EFI <diy_efi at efi332.eng.ohio-state.edu>
Date: Monday, October 05, 1998 5:55 PM
Subject: Re: Min throttle plate opening & IAC

While it's called Idle Air Contoller, that encompasses alot of terriotory.
An idle speed too high or too low triggers a high IAC count.  Mixture
can also play a limited part in the picture.  If the coolant temp is too
high or too low you can have a high IAC count.  TPS also falls into the
mix.  An electric drill, and sheetmetal screw can be used to defeat a
IAC plug.  Careful use of an ice pick with a hammer can work.
And like I've always said your results may vary.
Cheers
Bruce


>If you haven't cleaned the throttle body yet, do that first.  It
>definitely affected the IAC position on a car I had.  Some of the >sprays
don't work that well --  it's best if you can see that it's
> clean.
>Hopefully, someone else can answer your real questions...
>On Mon, 5 Oct 1998, Jason Weir wrote:
>> Ok,
>>     I have been nose deep in the 101 stuff,  I started from the
>> beginning and that be the idle.. Are my steps correct
>> 1. set min throttle opening
>> 2  set low rpm timing values
>> 3. adjust VE table so IAC > 10 and O2 swings rich-lean-rich nicely and I
>> have my min idle speed...
>> Ok here is my question... My throttle body has the plug covering the
>> adjustment screw so I had to leave the min opening as it was.. Bruce
>> mentioned to use a piece of paper to set min throttle opening and then
>> shoot for 10 or less IAC well my opening is nearly non existent, would
>> not pass the paper test... Because the throttle plates are almost
>> completely closed would that lead to a higher IAC, I cannot seen to get
>> my IAC less than 20.. The lower I go with fuel the worse it runs...
>> What does the collective wisdom think?... Thanks Jason
>> Jason Weir
>> 88 Wrangler - 258 Chevy TBI
>> Fayetteville, North Carolina
>> http://home.att.net/~jweir/tbi/inject.htm  --- TBI Installation Page
>> mailto:jweir at att.net