Where would i find a A/F guage to check that out?
"Shane Moseley" <smoseley@ix.netcom.com> wrote in message
news:3B6721FC.ABEED4A3@ix.netcom.com...
> A slow response time from your oxygen sensor can cause the exact symptoms
you
> describe. Slow response can be caused by an oxygen sensor going bad, a
dirty
> oxygen sensor, recent exhaust system modifications, sensor relocation,
fuel
> additives, etc.
>
> If you had an A/F gauge - you could see this behavior visually.
>
> Hope this helps - Latr,
>
> Shane
>
> Paul Macey wrote:
>
> > Subject line says it all. Yellow Check engine symbol came on upon
startup
> > last night after my truck sat in the hot parking lot at work, all day.
> >
> > Service dept reset the code on my 2001 4.7, said all should be fine but
> > scheduled a tentative appt for 8/20 to check into it further (they
allowed
> > me to stop by today with no appt to check the code and clear it)
> >
> > I have a Robert Shaw GT755-180 t-stat and Jet Chip II that have been
> > installed for at least a month. The temp gauge has and currently is, at
> > the same reading since these installs, the truck's performance remains
the
> > same.
> >
> > The t-stat appears to be functioning normal, during startup, it runs
> > smooth, same idle as always, and warms up to operating temp as it always
> > has before...looks like it is not stuck open or remaining closed, right?
> >
> > Thoughts on my next step? Just drive the truck till 8/20 to see if the
> > check engine light comes on again? Go under the covers and check the
> > t-stat? Bring it for service w/o the Jet Chip and let them pull the
t-stat
> > and possibly charge me for that service? Allow them to re-install the
> > stock 190 t-stat that I kept? Replace the 180 t-stat (are these
GT755-180s
> > bullet proof?). Call Jet Chip and describe the problem and ask for a new
> > chip? Reset the PCM (I know this would have cleared the original code)
> >
> > I hate to have the service dept or me go under the covers if it can be
> > avoided at all but I also don't want to cause any potential problems
with
> > the engine...just a quirk in the PCM code or temporary problem with the
> > t-stat/chip?
> >
> > Anyone else have the same code and symptoms? If so, what was your final
> > fix?
> >
> > Thanks in advance!
>
> --
> '96 IndyRam-HisIndy-MPI TB Pulleys RTcam MPComp HVoilpump
DynaGearDoubleRoller
> WindageTray CompTAs
> '96 IndyRam-HerIndy-numbered(#142)"Track Truck"
> '74 Triple-Black Dodge Challenger Rallye 360 EFI R&D vehicle
> '93 Dakota CC 318 - soon to be mine 8)
>
>
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