Re: cherokee keeps shutting down
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. |
Re: cherokee keeps shutting down
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. |
Re: cherokee keeps shutting down
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. |
Re: cherokee keeps shutting down
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. > |
Re: cherokee keeps shutting down
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. > |
Re: cherokee keeps shutting down
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. > |
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