what rpm at low load does the computer switch from closed loop to open loop? and what throttle percent does it switch from closed loop to open loop? car is an 88 st165. thanks
its by temp, at first it reads pre determined settings in the ecu,(open loop) once warmed up it reads off all the sensors (closed loop)
Open loop: An operating condition or mode based on programmed instructions and not modified by a feedback system A predetermined operating condition not based on exhaust gas conditions Closed loop mode: Once the engine has reached warm-up temperature, the engine management computer collects the precise data from all the sensors (coolant temperature sensor, throttle position sensor, oxygen sensor, etc.) to determine the most efficient air/fuel mixture for combustion. straight from my college textbooks.
yes it does run in open loop on a cold start up until it reaches temp. then it will go into closed loop. what i'm looking for is when it switches to open loop such as when going full throttle. there has to be a certain throttle percentage that it will switch to open loop. also, it should switch to open loop at a given rpm even in low load.