Quote:
Originally posted by russellcframe
Forgive my ignorance, but if the fuel economy might only be mildly affected (Not enough to warrant $120 and time to install)....what is the point in changing it at all? I know it's a periodic maitenance item....I just don't understand why (unlike fluids and lubricants that wear down and can decrease component life if not changed regularly).
Thanks,
Russ
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Here is my thought train on the matter. It's probably incorrect, and if so, someone correct me.
When the O2 sensor goes dead, the ECU for whatever reason seems to make the engine run very rich. (Lack of O2 in the exhuast indicating lean conditions?) Doing this for a long period of time makes the injectors fire off the most fuel they can, meaning really loud injector noise. I don't know if the injectors would fail after a while, but them going wide arse open can't help their life expectancy and it certainly wouldn't help in keeping them clean....
Then I heard something about a rich exhuast killing/clogging catalytic converters....
Besides, if you plan on keeping your yota for a long period of time, it should pay for itself.
Steve