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Hey all, I'm data logging my 95 K1500. I looked at it while driving today and the way it was acting did seem correct. Here is a picture of it at idle. Does it look like it's working correctly? Doesn't seem very consistant. I realize it's a narrow band so it's crap but it has huge sweeps then times where it is dialed in in spots.
Am I needing another?
Thanks for the help.
Rick
with a narrowband, swings are good. the faster the better, since that indicates that the PCM is picking up on how quickly the sensor is switching from rich to lean and is causing pulsewidth changes of less magnitude to keep the engine at stoich.
the PCMs do have some values that intentionally slow down switching speed at low airflow, otherwise it can get really uncontrollable with a slow/cold/aging sensor and cause some significant idle surge/stalling.
So from what you're seeing, does it look acceptable?
seems okay to me. I'm used to seeing 6 cylinders being read by a single sensor, which looks more or less like what you posted at an idle. at highway speeds, you would see the sensor crosscount go insane and the signal switches faster than what the datastream can be pushed out at.