Lon Stowell

I'd suspect the Crankshaft Position Sensor first. Generally
a failing O2 sensor just causes the engine control to go to
open loop mode.

Roughly 12/26/03 11:35, Jim McGeough's monkeys randomly typed:

> OK, sounds like something that happened to my '90 Cherokee a couple of years
> ago. I replaced the O2 sensor (that always seems to be the culprit) and it
> worked fine. However, your problem sounds more like a combination of a bad
> O2 sensor and a short somewhere in the wiring from the O2 sensor. Too bad
> most of our discussion group mechanics are on Holiday right now, or they
> could have given you a quick accurate analysis.
> "Jeff D." <jeff@fallingrockcentral.org.org.org> wrote in message
> news:jeff-92795B.16260622122003@news06.east.earthlink.net...
>> 92 XJ, 4LHO, 270K (60K on motor), started experiencing stutter-step in
>> idle and planned on tune up. All of a sudden, from cold just as temp
>> starts to rise, no hesitation, no rough idle, just shuts down and won't
>> restart til cold. I did plugs, wires, cap, rotor, fuel filter this AM.
>> Started and ran fine right up to temp and through a 10-15 minute test
>> drive. Left alone for awhile, maybe 2 hours, started OK, but back to
>> shutdown as temp starts rising. Although, this time it restarts and will
>> run OK and shut off/on with ignition as long as temp doesn't get to
>> cold?????????? Help.
>
>


--
Fan of the dumbest team in America.

Lon Stowell

I'd suspect the Crankshaft Position Sensor first. Generally
a failing O2 sensor just causes the engine control to go to
open loop mode.

Roughly 12/26/03 11:35, Jim McGeough's monkeys randomly typed:

> OK, sounds like something that happened to my '90 Cherokee a couple of years
> ago. I replaced the O2 sensor (that always seems to be the culprit) and it
> worked fine. However, your problem sounds more like a combination of a bad
> O2 sensor and a short somewhere in the wiring from the O2 sensor. Too bad
> most of our discussion group mechanics are on Holiday right now, or they
> could have given you a quick accurate analysis.
> "Jeff D." <jeff@fallingrockcentral.org.org.org> wrote in message
> news:jeff-92795B.16260622122003@news06.east.earthlink.net...
>> 92 XJ, 4LHO, 270K (60K on motor), started experiencing stutter-step in
>> idle and planned on tune up. All of a sudden, from cold just as temp
>> starts to rise, no hesitation, no rough idle, just shuts down and won't
>> restart til cold. I did plugs, wires, cap, rotor, fuel filter this AM.
>> Started and ran fine right up to temp and through a 10-15 minute test
>> drive. Left alone for awhile, maybe 2 hours, started OK, but back to
>> shutdown as temp starts rising. Although, this time it restarts and will
>> run OK and shut off/on with ignition as long as temp doesn't get to
>> cold?????????? Help.
>
>


--
Fan of the dumbest team in America.

Lon Stowell

I'd suspect the Crankshaft Position Sensor first. Generally
a failing O2 sensor just causes the engine control to go to
open loop mode.

Roughly 12/26/03 11:35, Jim McGeough's monkeys randomly typed:

> OK, sounds like something that happened to my '90 Cherokee a couple of years
> ago. I replaced the O2 sensor (that always seems to be the culprit) and it
> worked fine. However, your problem sounds more like a combination of a bad
> O2 sensor and a short somewhere in the wiring from the O2 sensor. Too bad
> most of our discussion group mechanics are on Holiday right now, or they
> could have given you a quick accurate analysis.
> "Jeff D." <jeff@fallingrockcentral.org.org.org> wrote in message
> news:jeff-92795B.16260622122003@news06.east.earthlink.net...
>> 92 XJ, 4LHO, 270K (60K on motor), started experiencing stutter-step in
>> idle and planned on tune up. All of a sudden, from cold just as temp
>> starts to rise, no hesitation, no rough idle, just shuts down and won't
>> restart til cold. I did plugs, wires, cap, rotor, fuel filter this AM.
>> Started and ran fine right up to temp and through a 10-15 minute test
>> drive. Left alone for awhile, maybe 2 hours, started OK, but back to
>> shutdown as temp starts rising. Although, this time it restarts and will
>> run OK and shut off/on with ignition as long as temp doesn't get to
>> cold?????????? Help.
>
>


--
Fan of the dumbest team in America.

bowgus

My understanding as well ... a failed O2 on my 96' 4.0 litre "should" cause
"start" mode meaning a rich setting ... and the symtoms would be real poor
mileage and eventually a clogged/carboned up/destroyed cat.


"Lon Stowell" <LonDot.Stowell@ComcastPeriod.Net> wrote in message
news:BF1Hb.485959$275.1382833@attbi_s53...
>
> I'd suspect the Crankshaft Position Sensor first. Generally
> a failing O2 sensor just causes the engine control to go to
> open loop mode.
>
> Roughly 12/26/03 11:35, Jim McGeough's monkeys randomly typed:
>
> > OK, sounds like something that happened to my '90 Cherokee a couple of
years
> > ago. I replaced the O2 sensor (that always seems to be the culprit) and
it
> > worked fine. However, your problem sounds more like a combination of a
bad
> > O2 sensor and a short somewhere in the wiring from the O2 sensor. Too
bad
> > most of our discussion group mechanics are on Holiday right now, or they
> > could have given you a quick accurate analysis.
> > "Jeff D." <jeff@fallingrockcentral.org.org.org> wrote in message
> > news:jeff-92795B.16260622122003@news06.east.earthlink.net...
> >> 92 XJ, 4LHO, 270K (60K on motor), started experiencing stutter-step in
> >> idle and planned on tune up. All of a sudden, from cold just as temp
> >> starts to rise, no hesitation, no rough idle, just shuts down and won't
> >> restart til cold. I did plugs, wires, cap, rotor, fuel filter this AM.
> >> Started and ran fine right up to temp and through a 10-15 minute test
> >> drive. Left alone for awhile, maybe 2 hours, started OK, but back to
> >> shutdown as temp starts rising. Although, this time it restarts and
will
> >> run OK and shut off/on with ignition as long as temp doesn't get to
> >> cold?????????? Help.
> >
> >
>
>
> --
> Fan of the dumbest team in America.
>

bowgus

My understanding as well ... a failed O2 on my 96' 4.0 litre "should" cause
"start" mode meaning a rich setting ... and the symtoms would be real poor
mileage and eventually a clogged/carboned up/destroyed cat.


"Lon Stowell" <LonDot.Stowell@ComcastPeriod.Net> wrote in message
news:BF1Hb.485959$275.1382833@attbi_s53...
>
> I'd suspect the Crankshaft Position Sensor first. Generally
> a failing O2 sensor just causes the engine control to go to
> open loop mode.
>
> Roughly 12/26/03 11:35, Jim McGeough's monkeys randomly typed:
>
> > OK, sounds like something that happened to my '90 Cherokee a couple of
years
> > ago. I replaced the O2 sensor (that always seems to be the culprit) and
it
> > worked fine. However, your problem sounds more like a combination of a
bad
> > O2 sensor and a short somewhere in the wiring from the O2 sensor. Too
bad
> > most of our discussion group mechanics are on Holiday right now, or they
> > could have given you a quick accurate analysis.
> > "Jeff D." <jeff@fallingrockcentral.org.org.org> wrote in message
> > news:jeff-92795B.16260622122003@news06.east.earthlink.net...
> >> 92 XJ, 4LHO, 270K (60K on motor), started experiencing stutter-step in
> >> idle and planned on tune up. All of a sudden, from cold just as temp
> >> starts to rise, no hesitation, no rough idle, just shuts down and won't
> >> restart til cold. I did plugs, wires, cap, rotor, fuel filter this AM.
> >> Started and ran fine right up to temp and through a 10-15 minute test
> >> drive. Left alone for awhile, maybe 2 hours, started OK, but back to
> >> shutdown as temp starts rising. Although, this time it restarts and
will
> >> run OK and shut off/on with ignition as long as temp doesn't get to
> >> cold?????????? Help.
> >
> >
>
>
> --
> Fan of the dumbest team in America.
>

bowgus

My understanding as well ... a failed O2 on my 96' 4.0 litre "should" cause
"start" mode meaning a rich setting ... and the symtoms would be real poor
mileage and eventually a clogged/carboned up/destroyed cat.


"Lon Stowell" <LonDot.Stowell@ComcastPeriod.Net> wrote in message
news:BF1Hb.485959$275.1382833@attbi_s53...
>
> I'd suspect the Crankshaft Position Sensor first. Generally
> a failing O2 sensor just causes the engine control to go to
> open loop mode.
>
> Roughly 12/26/03 11:35, Jim McGeough's monkeys randomly typed:
>
> > OK, sounds like something that happened to my '90 Cherokee a couple of
years
> > ago. I replaced the O2 sensor (that always seems to be the culprit) and
it
> > worked fine. However, your problem sounds more like a combination of a
bad
> > O2 sensor and a short somewhere in the wiring from the O2 sensor. Too
bad
> > most of our discussion group mechanics are on Holiday right now, or they
> > could have given you a quick accurate analysis.
> > "Jeff D." <jeff@fallingrockcentral.org.org.org> wrote in message
> > news:jeff-92795B.16260622122003@news06.east.earthlink.net...
> >> 92 XJ, 4LHO, 270K (60K on motor), started experiencing stutter-step in
> >> idle and planned on tune up. All of a sudden, from cold just as temp
> >> starts to rise, no hesitation, no rough idle, just shuts down and won't
> >> restart til cold. I did plugs, wires, cap, rotor, fuel filter this AM.
> >> Started and ran fine right up to temp and through a 10-15 minute test
> >> drive. Left alone for awhile, maybe 2 hours, started OK, but back to
> >> shutdown as temp starts rising. Although, this time it restarts and
will
> >> run OK and shut off/on with ignition as long as temp doesn't get to
> >> cold?????????? Help.
> >
> >
>
>
> --
> Fan of the dumbest team in America.
>