Well I thought I had the issue resolved until temps dropped to -40 for the past week or so - and it stopped working again.
Using the Scangauge I monitored the IAT and it was reading 500* (which I now believe is an issue with the Scangauge), so I disconnected the sensor and it defaulted to 68 and the high idle seemed to work normally - when the engine was cold.
Today I spent a bit of time playing with it and was pretty successful controlling the idle with the sensor disconnected, once it warmed up I lost all control of the high idle.
I tried changing the default to 0*F , setting the Cold Idle control to be always on - regardless of temp - and it still wont work when the engine is warm.
When the sensor is disconnected does it substitute a different temp sensor?
As a last ditch effort I plugged the sensor back in, and still no high idle function.
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