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I have a 96 camaro. Stock thermostat temp is 195* for this year. I currently have a 180* thermostat in my car now. I wanted to go with the 160* thermostat but I wasn't sure if that would resist the computer into running in closed loop (optimal performance). I know only 00+ I beleive had problems with throwing codes (correct me on the year if im wrong), so throwing a code is not to my concern, but I am looking for an answer on what temp the computer runs in closed loop mode.
And i have a manual fan swicth as i presume some of you may ask. Thanks in advance.
<blockquote>quote:</font><hr>From the GM Service Manual:
To provide the best possible combination of driveability, fuel economy, and emission control, a closed loop air/fuel metering system is used. When the vehicle is first started, the PCM controls fuel delivery in open loop, ignoring the HO2S signals and calculating air/fuel ratio based on inputs from the engine coolant temperature, throttle position, and mass air flow sensors. The PCM will begin using the HO2S 1 signal for controlling fuel delivery (Closed Loop). when the following conditions have been met:
The HO2S output signal is varying, indicating that the sensor is hot enough to operate properly.
The Engine Coolant Temperature sensor indicates coolant temperature above 40°C (104°F) with manual transmission vehicles or above 20°C(68°F) with automatic transmission vehicles.
Time since start-up is at least 15 seconds for a warm engine or 90 seconds for a cold engine. <hr></blockquote>
This answers my question that closed loop begins at 104*. Therefore since a 160* thermostat will allow the engine to warm up past 104* and that it will also allow the exhaust temps to heat up the 02 sensors, a 160* thermostat is safe to use on my car.
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