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  #41  
Old 01-31-2025, 08:55 PM
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Are P0171 and P0175 the only codes now? If so, I don't think the MAF is causing them. The second bank is getting too much fuel. The extra fuel is causing rich fuel trims. Have you OHM the injectors? "This code will set when the ECM can not compensate for the amount of air or fuel required to return the air fuel ratio back to the set parameters." It's not happy with something on bank 2. Cylinders 4,5, and 6.
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  #42  
Old 01-31-2025, 09:14 PM
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always lean, never rich

No, I'm not getting codes anymore (but I would have, if I had kept using the Siemens-VDO MAF that went wonky during the test run back on Sept.7,2024).

Also, no bank2 is lean like bank1. It was always P0171 & P0174 (not P0175) that I had been getting. Never a rich code.
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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide
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  #43  
Old 02-01-2025, 11:46 AM
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Oh, so the X5 is code free? I'll send you the OEM MAF today. Please let us know how it works after all emission tests are passed.
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  #44  
Old 02-01-2025, 02:05 PM
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a proven good MAF to test with...yay!

Quote:
Originally Posted by X5chemist View Post
Oh, so the X5 is code free? I'll send you the OEM MAF today. Please let us know how it works after all emission tests are passed.
I passed emissions testing back in October, after resetting the fuel trims to zero, by unplugging the MAF, and quickly running a drive cycle on the way to the inspection station (all monitors, except EVAP, reset within 10 miles).

The cheap $20? MAF I'm using never lets the fuel trims get into the range where a SES /MIL light is set, but i wasn't taking any chances. Since i installed the $20? MAF, I've been resetting fuel trims this way periodically, and thus avoiding any limp-home situation. That's also why I started this thread, because I wanted a way to either reset the fuel trims or tune the MAF's signal to the DME from inside the truck, in order to workaround having to unplug the MAF itself (hard to do, when in traffic, or in the rain).

I'll inform you of the results after testing with your OEM MAF, in this thread. Got my fingers crossed!
__________________
01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide
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