2002 4.0 5spd 140k-ish miles.
I haven't had a ton of time to dive into the jeep yet, but so far I'm at a bit of a loss. Any help/insight is much appreciated. So here's what's going on:
I was sitting with the jeep idling a few days ago after I arrived at work and the engine kind of stumbled, the oil pressure gauge dipped a little, and the RPMs surged for a second. Then, it seemed to idle a little rough, but nothing crazy. Later that evening when I headed home, it had a major hesitation when I would accelerate. First at low RPMs, then it would clear a little bit, then hesitate again until I shifted gears. Almost like it was loading up on fuel or the cats are clogged or something.
I didn't get to look at it until today. I see no vacuum leaks, my computer is telling me all sensors are operating properly (not sure I believe that), the cats don't really seem to be clogged based on IR gun temp readings. It didn't throw any codes until today, and they ended up going away on their own. Codes were P0303 and P0135.
All sensors, except Crank Position Sensor, have been replaced in the last 30k miles and a new battery installed 8 months ago. Also, the dash acted crazy for a bit and I've only gotten about 148 miles on this tank of fuel and I'm on empty... Usually I get around 230 miles to a tank before I fill up. I've included a link to a video of the dash acting up. The brake light started flashing, it started beeping, and the speedometer started sweeping.
I've seen this before and also diagnosed it/fixed it for someone, but i can't for the life of me remember what the problem was.
My suspicion is it's a sensor or possibly coil pack, a ground came loose somewhere, or something similar. I'm not ruling out the O2 sensors even though they're new, but I'm doubting that's the problem. The engine otherwise runs/sounds as if there's no mechanical issues--just the miss/hesitation /whatever it is. Hoping I didn't lose a lifter/wipe a cam lobe, but again, it certainly doesn't seem like it. It truly seems like a clogged cat, but they don't seem to be clogged, and I don't see how that would explain the dash issues.
Any ideas?
*I typed this on my phone, so I apologize for any formatting or other errors.
I haven't had a ton of time to dive into the jeep yet, but so far I'm at a bit of a loss. Any help/insight is much appreciated. So here's what's going on:
I was sitting with the jeep idling a few days ago after I arrived at work and the engine kind of stumbled, the oil pressure gauge dipped a little, and the RPMs surged for a second. Then, it seemed to idle a little rough, but nothing crazy. Later that evening when I headed home, it had a major hesitation when I would accelerate. First at low RPMs, then it would clear a little bit, then hesitate again until I shifted gears. Almost like it was loading up on fuel or the cats are clogged or something.
I didn't get to look at it until today. I see no vacuum leaks, my computer is telling me all sensors are operating properly (not sure I believe that), the cats don't really seem to be clogged based on IR gun temp readings. It didn't throw any codes until today, and they ended up going away on their own. Codes were P0303 and P0135.
All sensors, except Crank Position Sensor, have been replaced in the last 30k miles and a new battery installed 8 months ago. Also, the dash acted crazy for a bit and I've only gotten about 148 miles on this tank of fuel and I'm on empty... Usually I get around 230 miles to a tank before I fill up. I've included a link to a video of the dash acting up. The brake light started flashing, it started beeping, and the speedometer started sweeping.
I've seen this before and also diagnosed it/fixed it for someone, but i can't for the life of me remember what the problem was.
My suspicion is it's a sensor or possibly coil pack, a ground came loose somewhere, or something similar. I'm not ruling out the O2 sensors even though they're new, but I'm doubting that's the problem. The engine otherwise runs/sounds as if there's no mechanical issues--just the miss/hesitation /whatever it is. Hoping I didn't lose a lifter/wipe a cam lobe, but again, it certainly doesn't seem like it. It truly seems like a clogged cat, but they don't seem to be clogged, and I don't see how that would explain the dash issues.
Any ideas?
*I typed this on my phone, so I apologize for any formatting or other errors.
