When is a heated 02 sensor necessary ?

[Bruce Plecan]

> >  It seems as though this would help any motor go
> >closed-loop quicker, improving economy and performance.

> Not to my knowledge.  With the 730 ECM there is never a look at the stock
> O2 sensor to see if it is 'up to temp'.

While it doesn't **look** for a temp., there is a min temp., for the O2 to
work at.  So a steady low voltage would be an indicator that it's too cold.
also, low cross counts, or going open loop at idle after having been C/L.
Bruce


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