TBI 3-wire O2 sensor question

[dave w]

ACDelco ASF-74 is a factory 3 wire O2 sensor for a 1994 S10 4.3 Liter.

https://www.ebay.com/itm/ACDelco-AFS...UyV:rk:13:pf:0

dave w

[Daveo91]

I checked my wiring again tonight and yep, no issues. So I took the sensor out and hooked it up to 12v - after about 3 minutes the tip got pretty hot. I could still very briefly touch it without getting burned. Should it get hotter and should it warm up faster, or is this expected behavior?

[ony]

that is about how mine worked, before I put the 3 wire in truck would go open loop at 30 mph in 5th gear in the winter time.

[Daveo91]

Thanks for the input. I think I'll put it back in and run with it and see how it goes.