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Long detailed post ahead. Thanks for reading! 2001 TJ automatic, 4.88 gears (relevant for the speed figures below) BACKGROUND: I spent a ton of time late 2021 and half 2022 trying to troubleshoot a misfire issue. Replaced just about every sensor; Mopar replacements where possible, forum...

I'm wondering if anyone can help me with a picture or two of the bracket listed as number 5 in the image below? I'm hoping to see how it is mounted to the engine/head. One of my lines keeps breaking at the compressor connection. I think it's due to pressure on the line caused by the bracket...

I have an interesting one! I've working on getting my 2001 TJ 4.0 Automatic back to a respectable running state, and having a nightmare of a time with it. Check this thread if you're interested in more detail on that - https://wranglertjforum.com/threads/yet-another-misfire.59466/ I just...

Thanks @pagrey for the input there! Thats going on the list of things to check. However, I found some new and interesting info about my bastard Jeep today. I took it to the local Jeep dealer to have the run their diagnostic tool and see if there might be anything more they could tell me. All...

No, I have not. Short of getting into disassembly and physically checking the chain, I haven’t hear of a reliable way to check if it’s good or not. After everything I’ve done, I’m hesitant to get into pulling apart and replacing internals. Plus, the long block was replaced around 136k miles...

Oh absolutely, if it weren't noticeable, I'd move on. I'll try to describe it as accurately as I can: When first starting up, at idle, it feels pretty good, maybe like theres a slight hiccup in a cylinder occasionally. Until it really warms up driving around on city it feels great, plenty of...

Oh man, looks like I’ve been neglecting the thread! Thanks for all the input fellas. At this point I think I’ve ruled out ignition and fueling components as the problem. All the sensors have been checked out, plugs, injectors, intake and exhaust manifolds sealed up (installed a header), etc...

Update: Got a replacement intake manifold (and a Banks header while I was at it) install finished up and... no difference. 😭 First drive out after getting everything buttoned up popped the same codes; P0306, P0305 and P0300. One thing that I can note through all of this is that the misfire is...

Ok so I’m working on replacing the intake right now and while inspecting inside the ports to check the valves I found a couple pieces of plastic inside the port for the intake valve of cylinder 5. Anyone have thoughts on what it might be? I can tell it’s been there a while, it’s worn like it’s...

Probably convincing myself it’s the issue more than anything. I just want this misfire to be gone! 6 is not the only cylinder showing misfires btw, it’s just consistently the first. Others do pop up depending how long I keep RPMs up. Like on my 5ish mile test drives after part swaps, 6 will be...

I'm no master of technical aspects of engines but I can take an educated guess. These motors don't have sensors on each cylinder to analyze performance individually, the PCM detects change in cylinder RPM through the crankshaft position sensor and uses that determine which cylinder is missing...

We'll see! It's certainly A problem, don't know yet if it's THE problem. I took that JB Weld suggestion and ran with it; I did notice an improvement, but the misfire is still present. I went ahead and ordered a replacement manifold and gasket, they should both be in next week and hopefully I'll...

Thanks for the suggestion!

Today while I was poking and prodding the Jeep in hopes it would give me a sign, I found a problem. One that from all I can tell would cause the PCM to report misfires that it would have trouble pinpointing. There is a crack in the intake plenum just forward of the injector for cylinder 1. I...

Absolutely does not add more confusion. I appreciate all the input and I'm sure poor souls who come along in the future will as well! You talk a lot about the cam sensor, but it was actually the crank sensor that I had tried... until today. I have read all of the posts saying to always go with...

Is it possible to get false positives on a leak down test? I was able to get to work on the Jeep today and perform compression and leak down tests. Everything showed about as good as one could ask, numbers are well within spec; 125-135 psi and 20%-30% loss. I did notice I could hear a bit of...

I have an export from my BlueDriver OBD2 scanner; I captured data from about a 30 minute drive with a decent range of driving condition. I wouldn't know what is normal on those graphs, and he didn't seem too concerned about it so I haven't looked further into the live data. Have not done a...

Still rattling down the road when we take her out. My buddy lent me his compression and leak down testers, I'll be running those tests by the end of this coming weekend. Hopeful that I'll have something conclusive to report by then.

@DropTopDon thanks for the leads! I checked out your threads and, while the misfire sounds familiar, your codes are totally different. I haven't seen anything beside P0306 and, occasionally, P0305. You did put me on to the resource center where the service manuals so thanks for that. Also, your...

I did some inspecting and tried some wiring fixes today with no luck. The wire loom appears to be in great shape, no damage to the loom and I don't see anywhere any of the wires could be damaged inside. Just to be clear, the suggestions above are talking about the loom that runs around the back...