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Open loop, closed loop
I'm still learning about EFI. As I understand it, the system can either operate in open loop or closed loop. In open loop, the injector duration comes straight from the ECU table, without any modification. In closed loop, the O2 sensor readings can cause a modification to the values in the table. So I guess that open loop is like a failsafe mode and as such, the engine will run rich.
So my question is, what are the conditions for running in closed loop and what would cause a change back to open loop.
Another related question. My shop manual says that the O2 sensor heater acts to stabilize the sensor's output. I dont understand how that would work. I assumed it preheated the unit so it could go into closed loop faster. If that is the case, does it make sense to turn on the ignition a minute or two before actually starting the engine, giving the O2 sensor time to heat up?
I have a feeling that I am out in left field in my reasoning. I'm sure someone here can set me straight.
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krousdb 
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