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1999 2500 - rebuild with some issues

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1999 2500 - rebuild with some issues

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Old 06-11-2019, 08:59 PM
Charaschak
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Default 1999 2500 - rebuild with some issues

Hello- been lurking for a bit since I picked up this truck; brief history:
Bought a 99 2500, 5.9 gas motor, manual trans, quad cab 4x4 that had been sitting for about 6-7 years (has 170k on it). Incredibly enough, little rust but a lot of original parts. Been rebuilding it since February.
New heads, cap, rotor, wires, plugs, coil, gaskets all around, plenum fix, new exhaust, steering box, cat, brakes and brake lines, whole new front end (tie rods, ball joints, shocks, etc...leveled and 35ís.

Truck now cranks right over and runs just about great.
Ive been having a code for o2 (p0135) and replaced a new Bosch sensor with an NTK. Made a difference but it came back today along with p0132, random misfire and misfire 1-8 as well as p1391 (cam or crank signal).

None of these other than the o2 were present prior to this evening. Thanks to HeyYou for the assistance previously.
I can attribute the misfire to plug wire routing since I didnít do it with the TSB in mind, yet.
Thoughts on the upstream o2 and other codes would be appreciated. It runs great. Even when I get the misfire flashing light, itís idling and running just fine. I drove around for about 50 miles this weekend and other than the o2 which popped up right away and never came back after being cleared (even multiple stops and prolonged shut offs).


.
 
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Old 06-11-2019, 09:09 PM
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Nice.

That code is for the O2 heater circuit...... since you are seeing the code with different sensors, likely a wiring issue. Verify you are getting 12 volts to the sensor, engine running. and it has a good ground.
 
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Old 06-11-2019, 09:17 PM
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Thatís along the lines of my thinking. Would the o2 not functioning correctly have a hand in the other codes? Seems hard to believe an o2 would be involved in a misfire. I had live data running on the scanner Sunday while driving and that upstream o2 started off at 1.00000 and then started working as designed after a few minutes. Wonder what thatís all about.

The crank/cam sensor code only showed up today as
pending if that matters.
 
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Old 06-11-2019, 09:30 PM
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O2 could potentially cause misfires, if it was giving artificially high readings to the PCM. See what short term, and long term fuel trims look like. (possibly a lean-burn miss) Cam or crank sensor could also give you misfires, if you are getting codes for ALL cylinders...... I would be looking at the crank sensor..... (though the cam sensor is cheaper, and easier to change..... ) Either one of those could cause misfires.... It would have been nice if dodge would have differentiated between problems with those sensors......

Does it run good for the first couple minutes, and then start screwing up?
 
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Old 06-11-2019, 09:41 PM
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Thanks for the input. Iíve been thinking along the same lines so itís refreshing b
It actually never really runs bad. Starts, runs and drives just fine. Idles smooth and Rpm doesnít fluctuate. There is only one point so far in the last few days that Iíve fired it up, run for a few, and then it sounds like itís starting to miss. Does that for maybe 30 seconds and then the Rpms bounce back up and all good from there. No CEL comes on during that little flutter and itís only done it once, maybe twice.
Itís a 3rd, extra vehicle, so I have time to get it right and donít plan to use it much but I want to resolve this nonetheless.
 

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