X5 stalled/set codes while being inspected!

[g300d]

Good to see you got it running!

[X5chemist]

Nice! I was about to post the same video. Drive it like you stole it!
Report back the new fuel trims!

The video guy didn't install the new pump!

[80stech]

Yes, the ring goes on the tank NOT the pump. Take it out one more time to check the sender and your work and look for open or short (I think open is full but you can verify that by unplugging the connector) I've never had to reset or recalibrate anything.

[workingonit]

On another day. It took me another 2 hours to gather and put away tools (and at least 30 minutes to put the seat back in...cut the crap out of my hand doing so). At this point, I don't care what the dashboard fuel gauge says, I'll just fill it up and drive maybe 150 miles, then fill again. I'll get to it later this fall.

[andrewwynn]

The order of the seal is confusing because it almost always comes out with the assembly.

The level is averaged but if you don't reset it'll work itself out within a tank or two. How it affected me is that with a full tank it showed 3/4.


–awr–

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[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

[workingonit]

Originally Posted by workingonit

...
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.

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?

[80stech]

Sounds like you might have HAD a weak fuel pump for a while and/or maybe a restricted fuel filter. Maybe reset adaptations and don't focus as much on the fuel trims.

[workingonit]

Originally Posted by 80stech

Sounds like you might have a weak fuel pump for a while and/or maybe a restricted fuel filter. Maybe reset adaptations and don't focus as much on the fuel trims.

I would think that it's the opposite; my old fuel pump was weak, causing a lean condition (it barely made 50 psi, four years ago, and didn't hold pressure in the line for long). Now, I'm getting increased fuel flow, causing a temporarily rich condition (possibly for awhile, as the fuel maps adjust?), as evidenced by increased acceleration, and negative fuel trims.

I've experienced wild swings in performance on a couple of vehicles before, after changing component(s): 1.) a CPU + high-powered fuel pump +injectors + race tune, and even on 2.) on a pickup truck, following a simple battery replacement (it had to re-learn everything, for some reason...my '04 Chevy 2500HD).

At least that's what I'm hoping it is, otherwise I'm going to have to use the parts cannon (fuel filter, regulator, lines, etc.).

[80stech]

Reset the adaptations to get a clean start from where the mixture should be and go from there. A new fuel filter would probably be a good idea anyway.