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  #81  
Old 05-26-2022, 03:21 AM
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Quote:
Originally Posted by andrewwynn View Post
Mine is from m54 wouldn't help you.

I think I do have one from an m62 which might actually be the same and it might take forever but can't I ship using afp?
I wish but the base commander has blocked everyone not on AD from using the base. So no APO, PX or commissary. Thanks for the thought Andrew.

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  #82  
Old 06-28-2022, 09:04 PM
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cheap MAF may not be a long-term solution, after all

Quote:
Originally Posted by workingonit View Post
I've only got maybe an hour runtime on the new, cheap MAF, but so far, so good.

While actually driving the X5 (about 22 miles this morning), the LTFT's % are starting to move around a bit (from -3.12 to +0.78) but soon go back to zero. Meanwhile, the STFT's have ranged from -7.12 to +3.12, but stay mostly the opposite (+/-) of the LTFT's (making their composite total nearly zero). The MAF values go from 4.1g/s (lowest I've seen, at 745 rpm) to 36++g/s momentaily on acceleration, with a very fast response time.

Time will tell what the end result will be, but I've never seen it display negative long-terms before. I sure hope my lean codes stay away, but also that they're not replaced with rich codes!
It's been a month since the above was posted; the LTFT's are slowly climbing once more, and both reached 7.18% today, causing me some concern.

I've only driven <100 miles, all short hops in traffic, at ambient temperatures at or above 100F, with zero driving above 45mph, so I don't know if the LTFT's are affected or not, by the slow stop & go driving in the heat; and will the numbers keep climbing 'til reaching the absurdly high levels they were at, on the old Siemens MAF?

My X5 runs just fine, at 90C/194F, with no misfires or codes in a month, but will the fuel trims stay reasonable, or should I try another MAF (it's got to be a MAF problem; if an air leak, the cheap MAF wouldn't have helped at all)?
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'01 BMW X5-E53 3.0i (born 7/13/01)
topas-blau, Leder-Montana grau,
my new favorite project car

Plus four GM vehicles: 2 Daily Drivers, and 2 modified trucks (for hauling & camping):
3 Chevys:
'09 HHR Panel LS 2.2L,
'08 Cobalt Coupe LS 2.2L,
'04 Silverado 2500HD WT Reg. Cab
+ a '98 GMC Sierra 1500 Ext. Cab

- and 20 others, now gone, that I've had over the last 58 years (not counting the stillborn "1965 ChevyII altered/gasser project")
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  #83  
Old 06-29-2022, 07:16 AM
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I'll have access to my X5 late next week. I'll make myself a note to scan ST and LT fuel trims before disconnecting the battery. It's been a month since it was started. It will fire right up so I can monitor fuel trims before and after it reaches operating temperature.
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  #84  
Old 07-09-2022, 01:20 AM
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Another 10 days have passed, but only one trip in the X5, for 28 miles visiting two shopping centers. Same weather as last reported, but even hotter, with the BC reporting 106-110F, and the thermometer stuck into the A/C vent hitting 120F after each shopping stop.

The fuel trims are still staying where they were last time, but fell a bit when I did 6 miles on the highway, so perhaps low, slow, & HOT driving is causing odd fuel trims. Still, no codes!

I finally experienced the phenomenon: "old BMW's smell like melted crayons when hot" today, opening the door after grocery shopping. The interior was 120F, and smelled like crayons. Not bad, but odd. Time for Febreze or something.

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'01 BMW X5-E53 3.0i (born 7/13/01)
topas-blau, Leder-Montana grau,
my new favorite project car

Plus four GM vehicles: 2 Daily Drivers, and 2 modified trucks (for hauling & camping):
3 Chevys:
'09 HHR Panel LS 2.2L,
'08 Cobalt Coupe LS 2.2L,
'04 Silverado 2500HD WT Reg. Cab
+ a '98 GMC Sierra 1500 Ext. Cab

- and 20 others, now gone, that I've had over the last 58 years (not counting the stillborn "1965 ChevyII altered/gasser project")
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  #85  
Old 07-10-2022, 03:31 PM
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Work on my X5 was done over the weekend. Unfortunately, I didn't remember to get fuel trims before leaving. I did hook my Creator C310+ scanner quickly. Though the X5 was not at full operating temp, Air mass reading was 16 kg/h and dropping. It was still warming up because load signal was 125.2 mg/s. Next time I go up and work on it, I'll let warm up completely to take readings with my Foxwell.
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  #86  
Old 07-10-2022, 04:24 PM
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warm-up time (this week) in Texas is nearly instantaneous

Quote:
Originally Posted by X5chemist View Post
...Air mass reading was 16 kg/h and dropping. It was still warming up because load signal was 125.2 mg/s.....
I always use Torque Pro on my spare phone, hanging on my dashboard, to monitor MAF and fuel trim readings. I have the MAF set on grams/second, not kg/h; my current idle readings are 4.9-6.3 g/s typically (17.64-22.68 kg/h), which surely is better than what I was seeing previously. Where do you get a mg/s reading from?
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'01 BMW X5-E53 3.0i (born 7/13/01)
topas-blau, Leder-Montana grau,
my new favorite project car

Plus four GM vehicles: 2 Daily Drivers, and 2 modified trucks (for hauling & camping):
3 Chevys:
'09 HHR Panel LS 2.2L,
'08 Cobalt Coupe LS 2.2L,
'04 Silverado 2500HD WT Reg. Cab
+ a '98 GMC Sierra 1500 Ext. Cab

- and 20 others, now gone, that I've had over the last 58 years (not counting the stillborn "1965 ChevyII altered/gasser project")
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  #87  
Old 07-10-2022, 05:56 PM
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The Creator has the reading right below Mass Reading. I don’t know if I can change it. I did have my Fowell but it was loaded for my trip back to Texas. Hope to go back in 1-2 months to finish the suspension refresh and oil pan leak.
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  #88  
Old 10-10-2022, 03:52 PM
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update on cheap MAF and fuel trims, prior to inspection

Three quotes from previous posts, to refresh memories, as it has been awhile since I spoke on the subject:
Quote:
Originally Posted by workingonit
I've only got maybe an hour runtime on the new, cheap MAF, but so far, so good.

While actually driving the X5 (about 22 miles this morning), the LTFT's % are starting to move around a bit (from -3.12 to +0.78) but soon go back to zero. Meanwhile, the STFT's have ranged from -7.12 to +3.12, but stay mostly the opposite (+/-) of the LTFT's (making their composite total nearly zero). The MAF values go from 4.1g/s (lowest I've seen, at 745 rpm) to 36++g/s momentaily on acceleration, with a very fast response time.

Time will tell what the end result will be, but I've never seen it display negative long-terms before. I sure hope my lean codes stay away, but also that they're not replaced with rich codes!
Quote:
Originally Posted by workingonit View Post
It's been a month since the above was posted; the LTFT's are slowly climbing once more, and both reached 7.18% today, causing me some concern.

I've only driven <100 miles, all short hops in traffic, at ambient temperatures at or above 100F, with zero driving above 45mph, so I don't know if the LTFT's are affected or not, by the slow stop & go driving in the heat; and will the numbers keep climbing 'til reaching the absurdly high levels they were at, on the old Siemens MAF?

My X5 runs just fine, at 90C/194F, with no misfires or codes in a month, but will the fuel trims stay reasonable, or should I try another MAF (it's got to be a MAF problem; if an air leak, the cheap MAF wouldn't have helped at all)?
Quote:
Originally Posted by workingonit View Post
Another 10 days have passed, but only one trip in the X5, for 28 miles visiting two shopping centers. Same weather as last reported, but even hotter, with the BC reporting 106-110F, and the thermometer stuck into the A/C vent hitting 120F after each shopping stop.

The fuel trims are still staying where they were last time, but fell a bit when I did 6 miles on the highway, so perhaps low, slow, & HOT driving is causing odd fuel trims. Still, no codes!
The third quotation was from 7/9/2022, three months ago, and all is well (as far as I know). Took the X5 on another short trip (under 20 miles, shopping), with multiple stops, and in stop-and-go traffic, without any highway runs. The cheap MAF is still working as before, with similar readings, and the fuel trims are consistently inconsistent (still displaying LTFT's bouncing from +3.18 to +7.18 or so, while the STFT's are balancing those out with similar negative numbers).

Temperatures outside were mid-80's, so it's not the hot weather causing odd fuel trims. I can only wonder why I've not seen the cheap MAF cause a new fuel map to set, where the LTFT's are at or around zero (my '04 Chevy 2500HD & '09 Chevy HHR Panel both have consistent zero LTFT's displayed). I could reset them to zero, by pulling the connector again, but then I'd have to complete "drive cycles" before the inspection, in the next two weeks (it took me 300 miles of driving to complete the "drive cycle" on the HHR last time, and over 500 miles on the 2500HD, three years ago).

I'm still considering getting another cheap MAF from the same mfg., as a back-up and/or for further testing, AFTER the inspection. I never got the OEM Siemens MAF that I was going to test with (hello Andrew???), and money is still tight (I could never justify -to the CFO- buying a $200-$360 MAF as long as the $22 MAF is still working).

Xchemist- can you give me your current MAF and fuel trim readings? Do your LTFT's ever zero out?
__________________
'01 BMW X5-E53 3.0i (born 7/13/01)
topas-blau, Leder-Montana grau,
my new favorite project car

Plus four GM vehicles: 2 Daily Drivers, and 2 modified trucks (for hauling & camping):
3 Chevys:
'09 HHR Panel LS 2.2L,
'08 Cobalt Coupe LS 2.2L,
'04 Silverado 2500HD WT Reg. Cab
+ a '98 GMC Sierra 1500 Ext. Cab

- and 20 others, now gone, that I've had over the last 58 years (not counting the stillborn "1965 ChevyII altered/gasser project")

Last edited by workingonit; 10-10-2022 at 03:54 PM. Reason: punctuation
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  #89  
Old 10-10-2022, 04:11 PM
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Sure. I'm actually driving the X5 today. I'll take a few snap shots when started, short ride home (10 miles in heavy traffic), and idle for a few minutes. I don't have my Foxwell. I do have the Creater C310. It should read out trims. I do have the OEM MAF too. I can install it later this week for numbers too.
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  #90  
Old 10-10-2022, 09:01 PM
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workingonit,
Here are pics of fuel trim readings. Short term trims stayed the same from cold start up to full temp. Almost 0. The long term fuel trims stayed almost the same. -3.0/-2.4 ended up at -3.7 for both front and rear cylinders. -3.0 trims align with a 3.0 L engine. Average city MPG is between 15-16 on consumer1 readings. For highway driving 75 MPH - 23-25 MPG. The best recorded MPG is 24.3 on an actual fill up.
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