7.4 Startup / Idle 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
7.4.6 Idle Warmup Duty / Steps
This sets the position of the IAC valve as a function of temperature when the engine is running when using
open loop mode.
7.4.7 Closed loop idle settings
Closed loop idle lets the MS3Pro target a set idle speed instead of opening the IAC valve a set amount. This is
used for compensating for changing engine loads. It should not be used to fix a roving or hunting idle at steady
load - you need to get the idle tuned so it is stable in warmup mode under constant load first, if you find the idle is
hunting.
The MS3Pro uses the engine state settings to determine if the ECU should engage closed loop idle. The rate
of RPM change needs to be below both the slow acceleration threshold and the slow deceleration threshold, and
the TPS needs to be below the throttle closed TPS threshold.
The Closed Loop Idle Valve settings tell the MS3Pro what range of valve opening to use and where to set the
valve when closed loop idle engages. Note that this screen will change between “steps” or “duty” depending on
whether you have enabled a stepper or PWM idle control valve.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 184
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