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Originally Posted by crazycory1
I have a 1987 s10 4.3l. It has a single wire O2 sensor. Its been running ruff, so I went to replace the O2 sensor.
I noticed that if I unplug the O2 sensor and let it run, it doesn't cause the ecm to throw a code. Is this normal? Shouldn't it detect that the wire for the O2 sensor is open? Thanks for you help.
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It won't happen in an instant. It will take a while for the computer to pick up on it. Make sure if you change it to disconect the battery for a few min to reset the computer.