doctorbrody Posted February 8, 2013 Share Posted February 8, 2013 Got my OBXT tuned for new injectors this fall, and the new tune picked up 30hp and 120tq over the old tune. Very pleased! On the dyno at one point there was a loud pop. Wasn't anything obvious, so the tuning continued. Next day I found a broken MAF o-ring, a stripping TMIC bolt and a TB clamp was slightly loose. Fixed all, which threw off the tune a bit. Car drives great and idles ok, but AF Learning A and B keep pegging at -15% and no amount of e-tune revisions can solve it. Learning C is at 2% and D is at 0% after 500 miles of driving. I've pressure tested the inlet myself and had a local shop smoke test it, and we can't find any leaks. Any ideas what could be causing a rich condition at idle? AP v2 DW 850cc Walbro VF52 Grimmspeed EBCS Cobb SF Forge BPV etc Link to comment Share on other sites More sharing options...
Austin2334 Posted February 8, 2013 Share Posted February 8, 2013 Take a look here... https://forums.cobbtuning.com/forums/showthread.php?70705-High-negetive-fuel-learning-in-new-COBB-maps This is a similar situation to yours and Bill from Cobb is walking through possibilities and such. Hope it helps. Link to comment Share on other sites More sharing options...
doctorbrody Posted February 8, 2013 Author Share Posted February 8, 2013 I've got an extra MAF in the garage - going to swap them out and start logging once there's enough snow for donuts... Hopefully I don't need a new O2 sensor - it would be my third in 144k miles. Link to comment Share on other sites More sharing options...
joeleodee Posted February 10, 2013 Share Posted February 10, 2013 I've had a rich condition in these areas that kept throwing a cel. It wasn't the maf sensor or the o2 sensor. It was actually improper injector latencies. If you exhaust the aforementioned possibilities, have you tuner tweak the latencies. Link to comment Share on other sites More sharing options...
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