Originally Posted by
bink
I had a nagging, persistent problem with Idle. 2001 Vette. 239/251 cam. 90 mm TB, Fast intake and headers.
The electronic throttle idle would periodically learn downward 4-5 g/sec and 4-5 % TPS. It would drop the TPS from 11-13% to 6-7% and Desired airflow from 11-12 g/sec to 6-7g/sec. It was driving me nuts!!
Added air for the fans -B4301, B4302 (.75/1.50 g/sec).
Added air to the "Idle Learn AC Limit High Table"- B4326 (4.00 g/sec)
I had already increased my "Idle Learn Drive Limit High"- B4324 (3.00 g/sec).
Problem is cured!!
FWIW.