techedtchr
NAXJA Forum User
- Location
- Maryland
Okay, I'm aware that there are many posts regarding no starts, but I've applied some of the info I've read to no avail. So, here goes:
1997 Cherokee XJ 4.0L HO Sport, AW4 auto, approx. 150k miles
Bone stock except for towing modifications (tranny fluid cooler, wiring for trailer).
The backstory:
Last year, went camping. Engine died suddenly, cranked but would not start. Had towed to repair facility, replaced fuel pump fuse and started right up. Techs could not find issue, ran the Jeep for an hour, did lots of electrical checks. $42 and sent us on our way. No issues for several months.
About three weeks ago, parked the Jeep, was running fine. A week ago, tried to start it, nothing. Replaced fuel pump fuse, cranked right up. 10 minutes later, dead. Replaced the fuse again, cranked right up. Died in about 5 minutes. Got frustrated, left alone.
Today, bought more fuses. Replaced fuse, cranked, ran for less than 30 seconds then died. Has not ran since. Got curious, tested fuse with multimeter, fuse was not blown. None of the previous fuses had blown. Started scratching head.
Tested the ASD, starter, fuel pump, and cooling fan relays, all checked out good. Popped them back in, still no start. Had dad-in-law switch ignition on with me standing over the fuel cap. Heard fuel pump cut on then stop, as should happen. Really boggled at this point. Jiggled shift lever, still no start.
Did some more reading in these forums, discovered CPS issue. Disconnected the CPS, used ohmmeter to check pins B and C. Checked on every setting, multimeter indicated open, as it should have. So, doubt CPS is bad. Now I am really stumped. I highly doubt the cap/rotor/wires are to blame because it ran great when it was parked. Where else can I look? Thanks!
1997 Cherokee XJ 4.0L HO Sport, AW4 auto, approx. 150k miles
Bone stock except for towing modifications (tranny fluid cooler, wiring for trailer).
The backstory:
Last year, went camping. Engine died suddenly, cranked but would not start. Had towed to repair facility, replaced fuel pump fuse and started right up. Techs could not find issue, ran the Jeep for an hour, did lots of electrical checks. $42 and sent us on our way. No issues for several months.
About three weeks ago, parked the Jeep, was running fine. A week ago, tried to start it, nothing. Replaced fuel pump fuse, cranked right up. 10 minutes later, dead. Replaced the fuse again, cranked right up. Died in about 5 minutes. Got frustrated, left alone.
Today, bought more fuses. Replaced fuse, cranked, ran for less than 30 seconds then died. Has not ran since. Got curious, tested fuse with multimeter, fuse was not blown. None of the previous fuses had blown. Started scratching head.
Tested the ASD, starter, fuel pump, and cooling fan relays, all checked out good. Popped them back in, still no start. Had dad-in-law switch ignition on with me standing over the fuel cap. Heard fuel pump cut on then stop, as should happen. Really boggled at this point. Jiggled shift lever, still no start.
Did some more reading in these forums, discovered CPS issue. Disconnected the CPS, used ohmmeter to check pins B and C. Checked on every setting, multimeter indicated open, as it should have. So, doubt CPS is bad. Now I am really stumped. I highly doubt the cap/rotor/wires are to blame because it ran great when it was parked. Where else can I look? Thanks!