serx7 Posted January 3, 2017 Share Posted January 3, 2017 So late yesterday I discovered my battery was dead, and being that I suspected it was marginal in the 1st place, I replaced it w/ a Duramax 35-DLG. During the day today I went to pass someone under only moderate boost and the car fell on its face. Almost felt like boost cut but I noticed my AEM WBO2 reading mid-8.x AFR. I datalogged the scenario and looks like MAF Voltage is spiking noticeably, sometimes pegging at 5V in 3rd, 4th or 5th by 3300 rpm and 15+ psi boost (my tune caps calculated load at 4 g/rev and caps airflow at 330 g/sec). I replaced the MAF w/ a new Denso one in mid-May 2015 and it's totally been fine until just today. Has anyone else seen similar behavior and/or know of suspected causes (aside from a bad MAF sensor itself)? Is it possible that I knocked into something while just swapping the battery last night? My initial thought is no, since the MAF and the battery are at opposite sides of the engine bay. I have a GS CAI but have been using their dry element filter since I installed the new MAF sensor so oil contamination shouldn't be a factor. I'll probably pull off the GS box and at least try re-seating the MAF sensor, but not sure that'll help any. Also, ~2 yrs ago I had a GM/AEM IAT sensor tapped into the outlet end tank of my IPR TMIC, and that IAT sensor was spliced into the factory MAF/IAT wiring during a SD conversion. Perhaps that splice is now compromised/failing? Link to comment Share on other sites More sharing options...
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