Quote:
Originally Posted by X5chemist
BMW codes have taught me code symptoms are beyond their description. The E3/E4 are rich fuel codes. Only because too much air is being detected (by O2 sensors). The ECM is adding fuel to try and reach ideal stoichiometry.
The MAF has been running for 25k miles. The OEM one I'm sending has 143k miles on it. I took it off for cleaning and never put it back. The replacement has been working so far.
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Undetectable vacuum leak and lazy after-cat O2 sensors are all I've been able to zero in on, after all this time. And the fact my original MAF was wacky to begin with. Starting in Nov.'21, it was first noticed to be drastically underreporting airflow, so I cleaned it, to no effect, and started my hunt for leaks, etc. The cheap $20? Chinesium MAF you recommended gave me better airflow and fuel trim readings immediately, but not quite perfect, and that's the way it's been, ever since, despite dozens of hours spent fiddling with it.
My OEM MAF had 210000+ miles on it when removed, and I tried it again 2k miles later (it went completely nuts), so I never knew if it was bad from the day I got the X (at 210008 miles). It'll be good to compare fuel trim and airflow readings I've been getting with the cheap MAF to whatever I'll get using your proven good MAF. Maybe I'll solve the problem using it, I hope.
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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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