I just realized last-night that the check box was checked for auto nominal IAC on the setup screen and that is what changes it. I unchecked the box.
I set mine to 35 but don't know if 30 or 35 is correct.
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Originally Posted by sstan
LAF - I see in the map you posted yesterday that you have your nominal idle IAC set to 29, why? DTT is recommending 35 in this field (basic module parameters). The IAC lookup is very dependant on this being correct. From the Idle Tech note:
"you can readily see that serious problems would arise if the Nominal Idle IAC value was incorrect. The injector pulse width calculation would be incorrect with the error tending to be greatest during cold start and hot restart conditions."
The IAC value used for lookup in the IAC Based TPS Adder table is calculated based on the following equation:
Table Lookup IAC = IAC Position – Nominal Idle IAC
Why don't you try increasing the nominal idle setting in your basic parameters? Your Alpha-N table is needing some manual smoothing especially in the 2.5% area at low RPM's. It might be worth a shot.
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