Quote:
Originally Posted by XfireZ51
Paul,
Unfortunately this procedure does not isolate the Min Air coming from the throttle body itself. The ECM adds and subtracts IAC steps based on a number of parameters which would still be active if setting IAC in this manner. So the proper procedure is to block off the IAC inlet completely. The easiest way to do that is by extending the IAC fully. I described the process for doing that in another thread which I believe Dynomite may have put in the Stickies.
The objective is to set the throttle opening just a tad below where the motor will idle on its own without any intervention from the ECM. The point of good tuning is to have the motor running as well as possible on its own, keeping ECM intervention at a minimum. The closer to optimal the motor runs, the better it will run. The ECM wasn?t designed to make up for a motor running in sub-optimal condition.
I like my idle IAC to be ~ 10-15steps.
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Two means to the same end: After reading your approach, I can see how your approach may be the better way to go - less iterations to get to the same point...is my point!
In defense of my "iterative" procedure, the issue - as result, the car runs terrific and
the IAC settled at 6 counts. ALL of the stalling issues and high IAC counts and idle stability (Pete's cams!), stalling after coming to a stop and often a moment after starting a cold engine and high IAC counts were resolved and never returned.