Closed loop

[buick83-T]

Just wondering what temp does the car have to reach for the computer to go into closed loop for 83' T-type?

 

[b4black]

I have heard 160-ish.

But looking on the shop manual, it says closed loop is when the O2 sensor is above 600°F and the coolant is above 66°F.

I have a 165° thermostat and I go into closed loop after about 3-4 minutes of driving.