Here is the flow-voltage mapping for the Bosch sensor utilized by my E39 M5. I find it curious that readings below 1.7 V correspond to negative flows. Questions Is it possible that air can flow the other way (maybe through some sort of pressure wave that results from sudden throttle plate c...

This shouldn't be too crazy. You will probably need a multimeter to test things. (If you watch the specials carefully, there is at least one tool outlet that gives these away as special coupon deals..) I would start the journey with the service manual. It's available here. Check out sectio...