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Welp.. It appears my firewall cutting had collateral damage. How needlessly foolish of me. Based on the wires cut, it appears to explain all of the engine codes and lack of start. Harness repaired and to-be reinstalled in a few days. At least I learned a lot about the wiring and PCM...

Few more things I checked today: Good checks: CCD bus - and + between PCM and TCM both check out good, 0.2ohms. Confirmed that 5v remains active to the sensors while cranking CkPS output wiring test, PMC C1 BLACK A8 ---> K24 18GY/BK CkPS signal wire CHECKS GOOD Bad checks: Injectors...

The sensors are all the same as were on the engine when it was still (running) in the XJ. The only sensor I replaced preemptively was the CPS with a mopar unit. I did test it with whatever was on there previously (the known-good unit) and that did not make a difference.

More troubleshooting today: TCM ground wire 24 good, 0.0ohms resistance PMC ground wires 31 and 32 good, 0.0 ohms resistance TCM diagnostics WIRING PASSES ALL FSM TEST (Ohm specs, voltage specs in gears, 2.49/2.51v tests) removed gauge cluster and DLC ohms between 4 and 11 jumped up to 120...

I am receiving the following codes: P1282 (I have fuel pump relay out while diagnosing this ASD issue) Fuel pump primes as normal when installed P0118 coolant temp circuit high P1694 No bus from ECM P0705 Trans range circuit (reverse lights function, new NSS installed) P1698 Fail to...

A few other things I should add. The CPS is a new Mopar unit. The gauges are not working unless I unplug the airbag controller under the center console. With the battery disconnected, I am reading 60 ohms between OBDII pin 3 and pin 11, which I understand indicates that one of the CCD Bus...

All, I am in the process of building an 89 Comanche with a full 1998 cherokee swap. Everything from the comanche is gone, so the vehicle is effectively a 98 cherokee for diagnostics. Everything has been swapped over at this point. I am unsure of where to start my diagnostics and I need some...

Time for an update. The misfire has subsided! Unfortunately I cant pinpoint what steps resolved it, but I will mention a few other things I did for anyone who may look at this thread as a checklist. I added a can of BG44k to the fuel tank, a can of engine restore to the oil (awaiting more...

For water, I used distilled and a spray bottle into the intake tube removed from the air box. Warmed up engine with a drive beforehand. Thumbed the throttle to maybe 2500rpm, sprayed fairly aggressively, maybe 3 full pumps a second. Very little hesitation from the engine. Took about 45 seconds...

So the misfire has subsided, but is not entirely gone. It seems much lighter until the PCM recognizes it and cuts the cylinder from firing. I am under the impression that the cleaning methods have worked a bit, but not quite enough to completely clear out whatever buildup may be causing the...

PCM swap did not make a difference. I did discover that my intake valve on cyl #1 did not appear to be rotating after pulling the rocker arm off. It had a stripe of wear instead of a crosshatch/bullseye pattern on the top of the valves stem. I stuffed the cylinder with weed Wacker line (at...

Thanks for the replies. That TSB and the cam sensor resync in that second article both appear to b apply to coil rail vehicles (00-01). I did, however, confirm that the distributor was still synced correctly with the oil pump gear, which it was. Additionally, these seem to refer to random...

Hello all, I have a 1998 Cherokee 4.0 5spd 4x4. I suddenly developed a cylinder #1 misfire and I am having a hell of a time finding the cause. I can feel the misfire at idle, hear it in the exhaust, and am receiving a P0301 code. The following have been tested and accounted for...

Okay, I do not have access to an oscilloscope but that noid light kit is cheap and I'm happy to add that to my tools. I did swap the injectors to no avail, so it does appear to be wiring/PCM related at this time.

Hello, On my 98 4.0 I developed a misfire on cylinder 1, which gave the p0301 code as well as confirmed by pulling the injector connector on cyl1 to no change in engine idle. I have confirmed good spark on cyl 1 by grounding the plug out of the cylinder, good spark. I have swapped...