Quote:
Originally Posted by workingonit
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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 aty times, under acceleration. WTF
Even at idle, inthe driveway upon returning home, it still looks odd (rich) to me.
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Another day...
I reset adaptations, as advised, then took it out on a 22 mile drive cycle (but mostly stuck in a stop-and-go freeway back-up situation). No progress towards a successful inspection, but seemingly headed in the other direction.
It drove fine for a mile, until I reached the hilly curved section near my home, whereupon it took off like a scalded dog, and set two faults and the SES light. i drove it another mile to a parking lot, where I read the codes P0172 and P0175, both RICH codes, on my Torque Pro app (doesn't give BMW-specific codes). I cleared the codes, and SES light, and carried on wit my drive.
Again, the X5 showed increased power & firmer shifts (probably partly due to reset adaptations), and the LTFTs steadily went from -4.69 on both banks, to -8.59 on both banks (where it stayed for the remaining 20 miles, and still is there at idle, in my driveway). The STFTs were a little better, I think, than last time, never reaching past -12.5 (as opposed to -28.5, previously) and often were going positive, as far as 8.5, once in awhile). Progress ?
I could live with rich fuel trims, as long as the SES light stays off, just long enough to pass this year's inspection...its' last (I had the oppossite problem with lead fuel trims for the last four years), but there were two glitches in driveablity, as I returned home.
At the same spot that it had accelerated too much, and then hung in gear returning home the other day (uphill left 90-degree curve), it seemed about to stall or go into limp mode for about 10 seconds following the curve, but it regained power just in time to do the same thing, on a flat 90-degree curve (right) that followed. Full power came back quicker, as I approached two full turns and my driveway in a left-left-right pattern over 600 yards.
I sure DON"T want stalling nor limp mode around my area, because of the narrow country roads with no turn-offs, and limited visibility (and tailgaters driving way over the posted speed limits).
Another thing, my O2 sensor monitor won't complete now, but it has always completed within 15 minutes or 15 miles of driving, previously. I'm hoping for some progress tomorrow (if I decide to chance driving a posslbly stalling X5).
OR should I just buy a fuel filter with regulator...it's the one item that could control over-fueling where there was under-fueling, before.
Here are today's Torque Pro displays vs yesterday's:
yesterday, emission monitors nearing completion
today, o2 monitor not completing
yesterday, 1st sign of rich conditions
today, rich LTFTs stuck at -8.59, worse?