ISC Dashpot Pre Position

Definition: tells the EEC where to maintain the idle during release of the throttle

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Description:

Hints:
Tells the EEC where to maintain the idle cduring release of the throttle. This is active above approximately 7mph. ISC_DASHPOT_PRE-POSITION & the DESIRED_AIRFLOW_NEUTRAL/DRIVE air flow #'s are asigned to a look-up table that applies a duty cycle to the ISC, there is no feed back as far as RPM or air flow.

In engine run/underspeed mode and when operating at part or wide open throttle, the ISC system is placed in dashpot pre-position mode. In this mode the ISC duty cycle is incremented a calibratible amount in anticipation of a required dashpot action. Proper dashpot operation is essential on systems having speed density fuel controls in order to avoid tip-in/tip-out stalls and HC (Hydrocarbon) spiking on decels.