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open loop/closed loop operation

Hey guys, So I'm trying to understand the different modes our fuel system has on our cars and was wondering if anyone know the specs as to when our cars

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Old 12-07-2016, 11:29 AM   #1 (permalink)
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Default open loop/closed loop operation

Hey guys,

So I'm trying to understand the different modes our fuel system has on our cars and was wondering if anyone know the specs as to when our cars are supposed to go into closed loop operation from a cold start. any help in this matter would be much appreciated as I am trying to figure out whether my thermostat or o2 sensors need to be replaced as I am getting a rich condition on my long term fuel trims of around -15%.
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