X5 stalled/set codes while being inspected!

[workingonit]

Following the installation of the new Hella fuel pump on the 21st in this thread https://xoutpost.com/bmw-sav-forums/...inspected.html, I only drove it down my driveway just far enough to turn it around, and left it at that. I rested a few days (of course I did, after every repair job I do, now) and finally, after some rainy days, decided to make a test drive today, on the 27th.

I had two items on the agenda: fill the tank, so I would know where the level was (I don't trust the gauge, since it reads full, and the tank wasn't), and to get the emission monitors to "complete" by driving a "drive cycle". The fill-up was 9.6 gallons, so I know that the gauge is wrong, and my "drive cycle" completed all but three monitors (I only drove 10 miles, in a loop around my semi-rural house, due to backed-up rush-hour traffic).

I'll drive another cycle until all, or all but one, monitors are complete, before I try again to get it inspected (its' final emissions certification, hooray!).


Problems? the X5 almost stalled twice (once backing out of my driveway, second time leaving the gas station onto a secondary highway)...it never previously did that. Plus, now, the accelerator is extremely responsive, with no hesitation (which it had before), so much so, that I thought it was in Sport Mode (making downshifts) or someone installed Nitrous on the M54, it was so much. And, there was another difference....

I've been chasing lean fuel trims for 4 years now, unsuccessfully, but they've been brought mostly under control sfter X5chemist donated a "proven to work" Siemens MAF to me (thanks again!). I monitor them constantly on my dashboard-mounted Android tablet running Torque Pro. The STFTs bounce from about +4 to -10, to adjust the LTFTs that stay in a +3 to +8 range (plusses indicating a lean condition). To my astonishment, I'm getting rich condition numbers, now.

While the LTFTs have started to waffle between -4 and +4, the STFTs are all over the place, and have gone as far as -28.5 at times, under acceleration. WTF

Even at idle, inthe driveway upon returning home, it still looks odd (rich) to me