Pelican Parts Forums - Question on BMW 3-Series E36 O2

Hi, Nick. I have a weird issue here as it seems to me like also benh said before that he has. My 318is 1993 is having trouble with a rough idle and even get stalled. I've checked the hoses and have none cracked; and I changed sparks and their wires. Then I'm going to the next step: O2 sensor and the idle control valve. But, I couldn't find the O2 sensor. Instead, I found a plug, similar to the electrical plug of the sensor, but sealed. I attach a picture. My questions are, regarding your answers to benh, is it possible this particular model came without the O2 sensor? I mean, that it never had one? If not, how can I know if the sealed plug is in the place that corresponds to the electrical plug of the O2 sensor? And in this case, is it a good idea to modify the exhaust pipe to incorporate the hole to plug the sensor? Or simply it works fine without this sensor in fact, it did?
I know that it's not the subject of this thread, but it also had a rattle after start it on, and during it was still cold, at the timing chain. I changed the tensioner, but now the rattle became worst. I'll try again with this, after changing the idle control valve and, eventually, placing the O2 sensor again. Is there a "right" position to enter the tensioner in its place or is it indifferent since simply it is putted in its place, taking care about each extreme are in theirs? Is it possible it didn't pop up while starting and maintaining over 2500 rev by 30 seconds? I apologize in advance if this new subject cannot be treated here; but I couldn't find a thread referred to this specific model.
Thanks a lot for your attention.

http://www.pelicanparts.com/more_inf...65600-3144.jpg

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