hows it goin guys? my dad is having a problem with his jeep. he parked it at work and it was running fine but when he went to leave it just cranked and cranked. i went to check it out today and i couldn't hear the fuel pump and i noticed the gauges weren't cycling when i turned the key on. i think its the fuel pump but was wondering if the gauges not cycling pointed to something different like a bad ground or ecu or something? what do you guys think?
If you have fuel and spark, check ths CPS. Does the tac move when you crank the engine ?
95' Jeep Grand Cherokee Laredo, 148k, 5.2, NP242, 46RH, 4" RC lift, all new adjustable ca's(2 IRO front uppers and the rest RC adjustables), nitro shocks, JKS TB's, Jet Chip, Dynamax cat back, Magnaflow cat, GTP hood vents. 31" Pro Comps with Rock Krawler "D"s. Westin brush/grill guard with Hella 500s, 411's, Solid diff covers, detroit locker rear, power lock in front, SYE and Tom Wood's front/rear shafts, RE discos, BPE's, d-rings front and back, factory tc and rad skid, hitch, Sliders next.
03' Jeep Grand Cherokee Laredo, (wifes Jeep) 99k, 4.7 5 speed auto, K&N, KYB shocks, drilled-slotted rotors, All the toys.
2000' Ford Superduty, F250, 7.3, 198K, 37's, too much to list.
Have you checked the fuses in the Power Distribution Center?(the black rectangular box next to the battery)
A few years ago, my '96 Zj had the same problem you describe. I found one of the fuses blown. It was the fuse for the ASD (automatic shutdown relay) I replaced the fuse and it started right up. Then, when I put it in gear,it blew the same fuse again. On mine the wiring harness for the rear oxygen sensor had sagged down and was rubbing on the driveshaft. The wires were worn through creating a short.
yea that was the first thing i checked, i didnt notice any blown ones. im goin back to look at it tomorrow hopefully i can figure it out. i googled the problem and found it might be the ecu or the factory alarm system so i guess i'll check that stuff out.
If a CPS fails, it'll let the engine continue running, but won't restart after you shut it down. Just another thing to check. Mine did the same thing as what you're describing and it was bad wires to the CPS.