Quote:
Originally Posted by ahanix1989
Is there any way to determine when my engine is in "open loop" mode? Is there a certain trigger I can tap into?
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A scanguage or OBDII reader can determine this. As for doing it yourself, best to just get an MPGguino assembled, they don't cost much and work well. It takes a computer to really determine what your OBDII is doing real time, can't really watch voltages.
Also on Dodge Open Loop is sometimes better than closed when the motor is cold, my truck is affected by temperatures dramatically, when cold my MPGs are 50% of when warm and when warm but not quite up to temp my FE floats about 25% lower than fully heated.