Usually if they are going bad they become slow when switching. The O2s have a
1V operating range and normally cycle 0-1V somewhere about every second. As
they age this becomes slower.
Fuel smell is either a very rich mixture or the vapor emission system is
screwed up. Are you getting any codes?
Paul
On 7/5/2006 5:40:07 PM, Steven W. Riggins (mailinglists@geeksrus.com) wrote:
> So if my O2 sensors are going bad, that would make it run too rich
> and cause some of the rich fuel odor I smell from time to time?
>
> On Jul 5, 2006, at 3:15 PM, Paul Nimz wrote:
>
> > There is no learning for the octane. The knock sensors fire off
> > when they
> > hear noise and the timing is immediately retarded. The new timing
> > numbers
> > will automatically be adjusted no matter what or when. Assuming
> > you knock
> > sensors and the code strategy is up to it.
> >
> > Now the less btu content of the higher octane will have a small
> > change on the
> > learned tables by requiring a slightly richer mixture when in
> > closed loop.
> > But the O2s will adjust to the proper 14.6 AF ratio then start
> > saving new
> > values to the adaptive tables immediately.
> >
> > But the WOT tables are fixed and therefore without adjustment you
> > get what you
> > get. Stock tables are way rich anyway for open loop (on the V8).
> >
> >
> I've always gotten a bit better mileage from premium, ~1-2 mpg, but
> > cost wise
> > it's
> a draw.
> >
> > I do see an advantage to using premium when the a
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