5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
I dont what it should be, but I'd expect that there are a few variables that will affect the MAF output, idle speed (volume of air going into the engine), altitude (possibly affecting heat disipation from sensor), ambient air pressure (affecting heat dissipation from sensor), humidity ?
I am no expert and there are others here that will respond in their own time, but it might not be as simple as meauring the output voltage, but then again it might be. Good luck with your problem. Have you tried simply disconnecting the MAF and seeing how the car responds without it? Thats what I did to isolate a MAF issue, cleaned it up with some break cleaner until I received the replacement unit. Good luck.
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