Re: IAT Adjusters -with a tech question for you smart guys

From: TommFern@aol.com
Date: Sun Feb 25 2001 - 14:40:34 EST


In a message dated 2/25/01 7:16:22 AM Pacific Standard Time, bernd@texas.net
writes:

<<
 Lemme look at my Dyno sheets...i've only been looking at the HP figures on
 the printed versions. We were mainly looking at the A/F on the screen only.
 The influence is minor as compared to adjusting the fuel pressure manually,
 but remember: Cold Air = More Fuel and More Timing / Warm/Hot air = Less
 Fuel and Less timing.
 
 - Bernd
>>
  This tool will probably help out a lot more in the summer, when the PCM
would have decreased fuel due to the heat. Theoretically, I would think that
the ability to run your motor richer would be more pronounced in the summer.
 While we're on this interesting topic, I have another question for anyone.
I'm wondering how much of a role the IAT sensor plays at part throttle
conditions( when the O2 sensor plays a large role)? I have at times gotten a
check engine light while even idling. It spits out a fuel injector code. I've
been told that this because the PCM cannot further compensate for the
perceived lean condition feed to it by the O2 sensor. I'm wondering if the O2
sensor can max out the pulse width by itself, rendering any more additional
inputs by the IAT sensor useless( to further richen it). In another words, is
the O2 sensor the "trump" card at part throttle conditions, or can it indeed
get help from the IAT to further richen it at part throttle. In the past,I
have gotten my headers to glow and the air fuel meter on the dyno($$) to read
15:1 at idle!
Tom



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