@Igoo65, @Jerry Bransford, whomever else...- I would PM you about this thread but I don't see that feature on this forum. YES, I've read through numerous posts here and on other forums. My situation seems to be bit different, I've tried to provide exhaustive data up front so someone can "walk into the movie halfway" and lend me their expertise. i'm a pretty competent moderately skilled shade tree mech. and have had 2 buddies with more knowledge than me get stumped over this one. Pardon the description but it addreses questions that might initially be asked. THANKS IN ADVANCE for y'alls help.
I have a painfully similar Crank-No-Start situation with my '05 LJ 4.0 6 spd.
Help plz!
I have a painfully similar Crank-No-Start situation with my '05 LJ 4.0 6 spd.
- Jeep ran perfectly well when parked last Oct.
- Parked, battery disconnected, no trickle charger (until 6th month till just before trans reinstall)
- Removed trans for reverse gear fix,
- I DID perform some wiring harness cleanup/repair while trans was out. Split the tape and plastic loom cover in many places and re-loomed with new plastic and high-temp tape. I was extremely careful when spliting loom. I doubt I even nicked a wire but.....anything is possible. Maybe I wrapped new tape and loom too tight? I'm pretty meticulous about such things.
- After re-install of transmission, dismal "crank-no-start" condition.
- I have performed the litany of diags and thrown CKPS (x3-original, Napa,Chrysler/Mopar), CPS, and now PCM. No change.
- The VERY odd thing to all of this...It has actually started 3 times and idled for 15-20 mins ea. time and ran like a sewing machine. Then upon shut down...crank-no-start again.
- Codes initially thrown were CKPS/CPS but those have been cleared and have NOT come back, subsequent code re: PCM not talking to SKIM module, Check Gauges,
- To best of my ability metered and verified 5v at CKPS harness at sensor location and verified 5v at CPS harness connection.
- All relays swapped with working "horn" relay
- SPARK test on coil rail resulted in NO verified spark on all locations but one, via plug grounded to block and in-line spark node light. One anomaly, most forward plug location had weak, intermittent spark (both test methods)??
- I've laid under Jeep and wiggled CKPS harness while someone cranked-to see if wiring had shorts or breaks. No change-I DID perform some wiring harness cleanup/repair while trans was out. Split the tape and plastic loom cover in many places and re-loomed with new plastic and high-temp tape. I was extremely careful when spliting loom. I doubt I even nicked a wire but.....
- Buddy w/$3K scanner go no CKPS/CPS codes when he did diag.
- Some gauge failure and SKIM key light intermittently appear. But not consistently.
- One theory-PCM back up batteries dead too long it no longer able to communicate with SKIM and other components-plausible? Even "New" re-flashed PCM exhibits same results.
- Second theory- possible CKPS harness short or break-but again, doesn't seem likely- no melting or visible chafing.
Help plz!