Took off oxygen sensor - stalled

[coopns]

We took off the front part of the exhaust system (like the first half that had the cat conveter) and replaced it. Took off the oxygen sensor and cleaned it a bit with some carb cleaner. Drove fine but I pulled up to stop and it stalled, sounded like it was idling a bit low. Worked fine today.

Any thoughts?

 

[bepperb]

When the engine is cold, it doesn't use input from the 02 sensor, it's open loop mode. When hot it does. Keep an eye on it. I doubt the carb cleaner would damage or leave a residue but perhaps.

 

[J. A. Rizzo]

Idle air control valve, dirty throttle bore and blade maybe. Carb cleaner could damage an O2 sensor and throw off the output voltage, causing the PCM to run the engine too rich or too lean. If the engine is a V-6 and there are O2 sensors in both manifolds but you only cleaned one of them, the difference between the two sides could cause strange problems. Usually O2 sensors are just a replacement item. I have only heard of cleaning them actually helping anything a very few times. Was the check engine light on prior to doing this work? Is it on now?

 

[mechtech2]

Don't attempt cleaning an O2 sensor.
It cant be done right.
If driving doesn't keep it clean, there is another problem.

This is my first guess why a sudden onset of problems occurred - you messed with a part.

Normally, vacuum and intake leaks, a dirty throttle body , or dirty or sticky idle air motor would be my guess.

 

[ARCOgraphite]

Check for exhaust leaks; cant tolerate ANY B4 the cat; also was BAT dicso'd? Relearn takes some time.

 

[eljefino]

I'd see if you can pull the fuel trim, if the O2 was compensating that much you may have another issue... crud in injectors, unbalanced injectors, vacuum leak.