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LOL...possible I guess. Just check and see if the sensors are having fluctuating voltage. If not fix that before you go any further. The fwd sensors tell the pcm how much to fuel the cylinders. Without that operating correctly you will never get the engine to run optimally.
Well I watched the Diagnosic tool the whole way home and took some videos of it. Honestly I’m not really sure what the logger is for that says #1 ignition, it doesn’t really follow the misfiring. I did notice bank 1s fuel is around -15% all the time. Bank 2 sensor 1s voltage does dip down pretty low sometimes.
I stopped by the junkyard but none of the 99-02 6.0 trucks had an o2 with the same style plug. I can’t find the originals.
Bank 2 sensor1 is not within spec. 91mv is less than the .1v the sensor makes in a lean condition. This is the sensor that was in the odd cylinder bank correct?
Yes it is. I assume when it says fuel trim -15, that means it’s cutting the fuel by 15%? If so that’s a pretty big deal I’d say. It misses 90% of the time, but it will randomly come in run good. Now the sensor isn’t always that far from spec. It’s within the normal numbers some time, but I’d guess the pcm isn’t going to chase the o2 as soon as it sees a difference to correct it. It has to have some soak time or delay?
The second picture is right when it stop missing and was running normally. The - fuel trim never went away.
No exhaust leaks, it’s odd you ask that because I got under the truck and checked right before you asked.
I have had a chance to read that article throughly, but that looks like a ton of good Information. The o2s could be the problem by what they say.
That’s the same o2s I have, there’s no external fuse for them, they are powered and ground through the pcm. I have new Bosches on the truck, and I have flopped them around. I can measure resistance across the wires, but they are clearly reading by watching the diagnostic tool. It almost has to be a bad sensor(s).
I flopped o2s from side to side, to see if the fault code would go to the other side. And it didn’t. So the problem really shouldn’t be from a bad o2. I guess I should check continuity through the o2 wires. I never really found a good pinout for the o2s I have
I read through that site when I put the truck together but I need to go back and read it with a fine tooth comb in case I missed something.
I’m going to add to the confusion. I took some pictures and videos back in April when this first started. Before I swapped sides on the o2 sensors.
Bank 2 sensor 1s voltage was dipping way down to .09. BUT bank 1s long term fuel trim was -15%. I had a code p0132 then, which is for bank 1. Last code I got was p0134. Man im really confused now. I guess I need to check my wiring now. And I will probably pick up 1 new o2 sensor to have.
I had to make a short trip today and figured it try it with the bank 1 o2 unplugged. Ran perfect, and I didn’t get a check engine light with confused me. Watched the diagnostic tool, and the most I saw it cut the Long Term Fuel trim was -1.9%. No more misfires on the cylinders either. I’m going to take it out further tomorrow and watch it. Fingers crossed
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