Ah, so, the long version? Ok, but only because I'm on vacation, LOL.
Once in a blue moon, on first start up for the last couple months, I might get one "miss" a block from the house. Then no issue. Almost made me wonder if the new fuel pump was not up to the old pump's performance.
Until a week and a half back. On the way to work (2.5 mile, 4 minute drive), it started missing, bucking and no power. Almost didn't make it to work. Barely made it home. Would idle almost perfect. But a slight miss approaching 2k, and definitely cutout closer to 3k. Waaaaaaa waaaaaaa wa wa wa akakakakakaka waaa waaaaa waa akaka waaaa. Just barely wanted to run. Among the already present fault codes, I now had the following:
P0303 Cylinder 3 misfire detected
p0304 Cylinder 4 misfire detected
P0340 Camshaft position sensor "A" circuit
P0352 Ignition coil "B" primary/secondary circuit
P0353 ignition coil " C" primary/secondary circuit
P1391 something something whatever
P0300 Random /multiple cylinder misfire detected
Over the course of 3 or 4 days, I had most of the above. First, 3 or 4, and then do some checking, then the rest of them in addition to the first ones. Ordered a Mopar CAM sensor off ebay, as I was led to believe it might be discontinued, so ordered one hoping it would be authentic and new. It had not shown up yet, when I decided to pick up a crank sensor and cam sensor from Oreilly's.
I have a used engine harness that I bought last fall in preparation of fixing any bad or corroded wires, like I found at the Bank 2, sensor 2 connector. I had decided that I would pop it on, in addition to the new aftermarket crank sensor last Sunday. Started at the crank sensor. Found the bolt loose. Hmmmm. Went ahead and replaced it, as its history was unknown to me. Did not replace the harness. Just the crank sensor. Drove it for 20 minutes. Ran perfect. I thought, "Is it playing with me because it's only 70 degrees out and something something whatever isn't hot yet?" Decided to drive it to lunch, when it started to softly miss like it had before. Not as violent. Like you had a pillow over it, LOL. Borrowed a car to run home and grab the aftermarket cam sensor. Put it on and.....it was as bad as ever. Barely 20-25 mph on the way home, took back roads. Even at stoplights, it was barely running. Back home, I put the old original Mopar cam sensor back on.
I work in a Ford parts department, so I decided to call the people I buy my Mopar stuff from the next day. GEEP4ME is not my first Chrys/Dod/Jeep product. Had them look, double check the info I had, and it turns out the crank sensor WAS still available, as was the cam sensor (but on backorder, but I had an ebay purchase coming). They ran the part number on the locator and a couple local dealers showed the crank sensor in stock. The oreilly sensor: $33. Mopar: $141. (sigh)
But I bought it. Waited a day to get the will to live to come back, and changed out the aftermarket sensor for the mopar. Cleared the codes and rechecked for faults. The list of codes that appeared made me wonder if it'd been struck by lightning, LOL.
View attachment 185389
And there were more.
But it was running fine. Cleared the codes again, and this time, I only had 3 codes, ones that I have had for almost as long as I've owned it. Yay! Progress. It's been running fine since. I even had a used processor coming, just in case. But even with that, you never know what you're getting.
Somewhere in the middle of all that, I stumbled upon that video I posted. I too, had read all that I could. Spent most of last weekend reading up on any thread across the web, trying to find a common link. One guy, replaced everything that could be replaced and still didn't have a working Jeep. Another replaced all the sensors and coil, and it ran fine. Still had 2 codes though. Another owner, did the same, but would have a miss every now and then out on the highway. Another put 4 aftermarket crank sensors in and then the 5th was a Mopar sensor curing everything. So, I gambled. With the scope in that video though, that would pretty much show exactly the issue. The problem is finding a guy local to me, or you, or wherever someone is, that has the same knowledge and tools. The Ford dealer where I work, doesn't have anyone that knows a Jeep system, like they might know a Ford system. Plus finding someone willing to work on it on the side, well, who knows. I do know a guy, with all my wholesale contacts, that I know is smart enough, probably smarter than the guy in the video. I was about to pick his brain, when the mopar crank sensor seemingly fixed all the recent rough running and misfires.
I could go on, about how many of us (yes, me too) at least with this particular set of running issues, are not much more than parts changers/guessers. But without 2 or 3 or $4,000 to spend on a scope and the experience in using it, you might as well pony up for the OEM parts to throw at it. Otherwise, hopefully the first guy you take it to (I've been there myself) DOES find the issue. You're going to pay him every penny he's worth for however many hours it takes him to fix it PLUS the OEM sensor price, provided he doesn't mark up the list price higher like most shops do. If you're unlucky, he'll be the 2nd or 3rd, maybe even the 4th guy you take it to.
Anyway, that is that.
