I unplug the harness to the #2 or #4 fuel injector and I can feel the engine missing, but the tech2win misfire data and misfire chart never show a misfire.
I went to table C5622 in TunerPro and set the counts for 0 and 6.25 engine load to the same values at 12.5 so that it should record at idle. Unplug injectors, still nothing.
Changed table C5621 in TunerPro and set the counts for 0 and 6.25 engine load to the same values as 12.5 so that it should record at idle. Still nothing.
Did a CKP relearn. Still nothing.
Drove the CJ7 around town, different speeds, RPMs, etc. Still nothing.
The current counters almost always stay 0 and the historical counters always say 0.
For example, when I unplugged the #2 injector for at least 2 minutes after all the changes above, #5 cylinder threw 4 misfires in the counter.
I have read the parameters for entering a P0300 code, but I'm not sure if those are the same for recording misfires? I would think since it occasionally throws a code like on cylinder 5 above, it's working?
I don't have a fuel sender for the LS. I'm using the CJ7 one to the gauge. In Tech2Win on the Enhanced EVAP Data screen, I have Fuel Level Sensor = 5.0 Volts and * Fuel Level Sensor Rea = 5.00 Volts. My Fuel Tank Remaini is 0%, so it thinks it's empty, so maybe that's why it's not triggering misfires? Should I wire in a 100 ohm resistor to pin 54 on the green ECM connector to fake a half tank of gas? I wouldn't think that was necessary to record a misfire, but I'm out of ideas.
Is it possible to just change the F0501 Fuel Gauge Calibration to something so that the 5.0 Volts tricks it into a half tank or something? I think that's Pulse Width Modulation. but I'm wondering if I change all the cells to "0.00" and put 50% tank to "100.00" maybe the ECM will be confused into a half tank?
The backstory is that my engine runs pretty well, then sometimes, 10 minutes into a drive, it starts missing really bad at idle and under load. Of course I'd like my misfire counts to work on the Tech2Win so I can get some readings when it happens and track down the problem. I found out I had chinese knockoff 41-110 plugs from Amazon and I got authentic plugs and swapped them in this weekend. This hasn't fixed the problem, so back to getting misfires to record in Tech2Win.
Sorry for the long post, but I figure some of you guys have a lot more experience than me and may have better ideas on how to track this down.
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