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Alright, probably (hopefully) the last update for a bit. Wiring harness has some damage under the hood that explained some of the parasitic draw, but still didn't account for everything. A full, thorough inspection revealed a perfect combination of old wiring beginning to crack & break and...

Alright, here's the update: Pulled the battery & alternator and had them both bench tested. Battery is lower than it was on CCA, but otherwise fine. Alternator is fine. Battery issue is likely the result of the repeated draining lately. Ran through all the voltage checks and nothing seemed...

Okay, here we go... '99 XJ, 4.0, Auto, NP242, 280K miles, big battery & ground cables, but mostly stock with a mild lift & 31s. Reman AW4 a couple months ago, which by the end involved a new battery as well, after a weird grounding issue killed the Red Top I had before. Engine is a reman 4.0...

Long story short, just put in a reman AW4, and a week later the CEL came on first thing in the morning. Was running fine, tried to pull codes with my Amazon special OBDII scanner, no codes found, tried to erase them anyway, CEL stayed on. Fast forward a couple days, and idle gets really rough...

The only code it's ever thrown is P0740, and the only symptom I've ever noticed from it is slightly higher rpm on the highway. I've never seen any other codes, and that one hasn't been present for the stalling issues. I don't know if/when the cat has been replaced. Does that sound plausible...

Where do I begin?? '99 XJ, 4.0 (reman, installed 11/19) AW4, NP242, stock gears, 3" lift, 31s. 246K on the body/trans, about 37K on the motor. Three times now, all a week or two apart, the engine has stalled within 30-90 seconds after seeming to start normally. First time, 4 weeks ago, was...

Had a hard time getting any consistent readings from the alternator last night, but decided I should at least try replacing it since I was running out of suspects. Wouldn't you know, that seems to have been the problem. Swapped in a reman from O'Reilly's, and even with all accessories...

I went with AER, because they're local and my mechanic had used them before. I think they produce Ford engines, but obviously they have the 4.0. I've liked it so far, though it took a while to get it working. My shop actually had to warranty out the 1st one before I even took delivery. They...

Just the standard handheld battery/alternator check tool at O'Reilly's. Which is part of why I'm not sure how accurate the results were... Where would I find the field circuit wiring? I can't seem to get a conclusive answer, unless this is also the fusible link, in which case I've replaced...

Have a low voltage (12-ish max) problem, but cannon can't seem to find the source. 99 XJ 4.0 AW4 233,686 miles (~12K on the reman engine) Basically stock, with a baby lift and 31s. And it's my daily/only. Last week on the way home the voltage dropped to 12 or so for a couple minutes, then to...

Holy Thread Revival, Batman! The outcome was a new boat for my mechanic, sadly. Most likely that it was some form of piston slap, because the #5 piston cracked to pieces a year ago yesterday. Managed to do some pretty damage to the cylinder head, as well. On the plus side, a new reman engine...

No worries about the flour comment; I assumed you were joking. Afraid it was something serious, though I don't know yet what it was. Engine clattered and died suddenly last night, and I haven't had a chance to investigate yet. Hoping my mechanic doesn't have a new boat soon... -alopeks

Yeah, I'm not gonna blow flour up the tailpipe... It would gum up the muffler bearings. -alopeks

Okay, pulled the belt, still there. Pulled spark plug wires (one at a time), still there. Also, shocked myself a little. Harmonic balancer has no visible play, and isn't rubbing anything. The otherday when I had the valve cover off, I ran the engine for a few minutes, and the sound was timed...

Sorry in advance for the long post. I'll start with the critical stats: 99 XJ 4.0, AW4, NP242 - basically bone stock. 221,000+ miles, and it's not just my daily, it's my only. Engine-wise, in the last 3 years (since I bought it) I have replaced: Radiator Vapor Canister Purge Solenoid Water...

DD, 99 XJ, 4.0, AW4, NP242, 208K, & about 4,000 miles since the (probably original) head gasket was replaced by a trusted shop. A couple of weeks ago, on may way to work (~25 miles each way) I noticed the oil pressure gauge was reading really low when I was at a stoplight. It had been lower...

Where are you located? I should have a used pair by the end of the month, once my replacements arrive. -alopeks

Bobbie, What did I say that sounded like I wasn't listening? I pulled the spark plugs, none of them are fouled, cracked, etc. I made sure they were all gapped to spec. All the wires are new, seated properly, etc. I don't see any arcing anywhere, I've inspected all the vacuum lines and used...

Not assuming anything. I know it received a tune-up when I bought it, because they also did a radiator flush, which later exposed a very small crack on the passenger side of the radiator. I've been keeping an eye on that as well. All the plugs look good, wires look good, and distributor seems...

Haven't seen anything unusual with the plugs, wires, or injectors. Doesn't mean there isn't something wrong, I just haven't seen it... -alopeks