mender Posted August 27, 2021 Report Share Posted August 27, 2021 (edited) I just installed an AEM AFR gauge in the CIvic to allow monitoring and datalogging via the S300. So far, the gauge has worked properly for about 30 seconds from what I can tell. I've been using my LM-1 Innovate wide band up until now for chassis tuning but it's clumsy trying to monitor the hand-held and match that to the rpm during the pull. I don't entirely trust the dyno chassis O2 readings and obviously don't want to go lean. Thus the AEM gauge, but I'm not seeing what I expect from the gauge, specifically a reliable reading. I've tested the gauge and O2 sensor with the sensor in free air by first unplugging the sensor lead and turning the power on. That gives the start-up sequence on the gauge, then a steady 14.7 reading as expected. I then power off, reconnect the sensor lead and power on. Start-up sequence again followed by 14.7 which after a few seconds starts to increase until it goes off the scale with the three bars remaining. I then sprayed brake cleaner on a rag and wrapped the end of the O2 sensor, which was getting moderately warm. The gauge then came back on and the numbers went down until it was reading 10.0. Unwrapped the sensor and the numbers went lean again. I repeated the brake cleaner/rag test but this time there was no response. I started over from the beginning, unplugging the sensor lead and powering on the gauge with the same result: 14.7 steady. Next step, plugged in the sensor lead and powered on again; 14.7, then increasing until off the scale. Brake cleaner and rag once again, and got the expected response but only once. I installed the O2 sensor in the second bung of the header and compared to my LM-1 as I did laps around my storage compound; got the expected readings from the LM-1 but no response from the AEM (full lean, three bars). Did the scheduled chassis dyno session that evening, again with the LM-1 reading properly and the AEM reading full lean. Did some tuning changes after setting the baseline and lost power, changed back to the baseline and lost more power. There are other things going on but I was really hoping to get the AEM working and the S300 datalogging properly. I called AEM and they had few questions, basically saying that the O2 sensor is faulty and sending me out a replacement. I doubted that it would arrive in time so in the meantime I bought another O2 sensor to test. So far I have the same results with the new O2 sensor (tested last night) so I'm starting to doubt the gauge now. Any thoughts or suggestions? My expectations were that the AFR gauge would mirror my LM-1 under most conditions but so far it seems like money wasted. Edited August 27, 2021 by mender Quote Link to comment Share on other sites More sharing options...
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