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Hi, thank you very much for the reply.
This sounds very valid, but I am afraid that in my case, the drop in performance goes beyond just benign detuning, it becomes ugly at times.
I will definitely try to put in the cut-off switch, though!
One other thing that I have just stumbled upon:
When I pulled out the PCV valve from the valve-cover, I noticed some amount ot oil spitting out of the hole, wiped everything off, put the PCV back in. The car seems to run good after such a procedure, but again-only for a couple of days. When the procedure repeated after a couple of days, performance seems to go back to normal, and so on.
The big question: is it normal for the engine to spit some oil through the PCV? How does PCV deal with it? Will a new PCV improve the situation?
Oil gets into the air-fuel mixture (after the throttle), then into the combustion chambers, then...fouls up the O2 sensor. Does that sound plausible?
Many thanks once again, please let me know what you think.
Len
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