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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / December 2005What Temperature does engine go to Closed Loop?
What temperature does the engine go into closed loop? I have a 1996 Chevy pickup with 5.7L and the gauge isn't reading as high as it used to. Probably need to change the thermostat but what harm does it do to run cooler than spec and at what temperature does it go to closed loop? > What temperature does the engine go into closed loop? I have a 1996 Chevy > pickup with 5.7L and the gauge isn't reading as high as it used to. > Probably need to change the thermostat but what harm does it do to run > cooler than spec and at what temperature does it go to closed loop? Dunno about yours, but my '88 2.8 V6 goes into closed loop as soon as it gets a good signal from the O2 sensor, which can be in as little as two minutes, regardless of coolant temperature. JazzMan  Signature********************************************************** Please reply to jsavage"at"airmail.net. Curse those darned bulk e-mailers! ********************************************************** "Rats and roaches live by competition under the laws of supply and demand. It is the privilege of human beings to live under the laws of justice and mercy." - Wendell Berry ********************************************************** >> What temperature does the engine go into closed loop? I have a 1996 Chevy >> pickup with 5.7L and the gauge isn't reading as high as it used to. >> Probably need to change the thermostat but what harm does it do to run >> cooler than spec Drastic increase in engine wear. Don >and at what temperature does it go to closed loop? > [quoted text clipped - 4 lines] > >JazzMan > What temperature does the engine go into closed loop? I have a 1996 Chevy > pickup with 5.7L and the gauge isn't reading as high as it used to. > Probably need to change the thermostat but what harm does it do to run > cooler than spec and at what temperature does it go to closed loop? Don't know about chevys, but the Ford EEC-IV I have in my 351C go into closed loop 90 seconds after a cold start if it sees a signal from the oxygen sensors. It only takes 30 seconds on a warm start. I see this in the logs from the EFI. It does need to get up to full temp to leave the warmup strategy and enter the warm cruise strategy, which is the most economical strategy. It can be in closed loop while still in warmup strategy. I had to lower the temp for entering warm cruise from 195F (?) to 170F for it to work properly with the 180F thermostat when I retrofitted the EFI to the 351C. Thomas > What temperature does the engine go into closed loop? I have a 1996 Chevy > pickup with 5.7L and the gauge isn't reading as high as it used to. > Probably need to change the thermostat but what harm does it do to run > cooler than spec and at what temperature does it go to closed loop? Depends on if the O2 sensor has a built in heater. Sorry, I don't know if yours does. Otherwise, from what I've read, the computer kicks in when the temperature reaches 150 deg F. Unfortunatley I don't know what part of the engine has to reach 150 deg, but it's probably the O2 sensor because that's what has to get warm enough to start sending a signal to the computer. > What temperature does the engine go into closed loop? I have a 1996 Chevy > pickup with 5.7L and the gauge isn't reading as high as it used to. > Probably need to change the thermostat but what harm does it do to run > cooler than spec and at what temperature does it go to closed loop? Thanks for the feedback and comments. bb |
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