I know nothing about mecahnics.
Just trying to make sense of things!
I was the first to say - " the tube is round! The MAF "hair" is perfectly diametrical! It doesn't matter!"
As soon as I rotated the MAF 30º all symptoms sttoped!!!
When I say symptoms I say to the point of engine light beeping and blinking constantly, and car refusing to go up hill!, at low speeds!!
I only insist in this subject because of this argument:
- ECU settings were configured with the MAF in one particular position! I don't even discuss if the position is the best! I don't care! I only care that the ECU cares! And "she" might be getting fooled! :-) In fact my car seems to work perfectly at 12 o'clock and 11 o'clock. But not so well at 9 or 10 o'clock. Haven't tried other positions!
So the question remains:
- Rotating the MAF alters the measuring or gives "false/different" readings? Yes or no?
If the answer is yes, how does the ECU cope with that?
(when I say alters the measuring I mean - does the flow of air remove the same amount of heat from the "hair like wire", no matter the position of the wire? Of course, position in relation to some curve in the tube or other phenomenon!)
Again I don't know anything about mechanics, but I do play woodwind instruments, and air inside a tube is not THAT simple. That massive black plastic tube coming from the air filter isn't full of air all the time, and does the air filter diffuse all that well???
Again, the symptoms were at very very very low RPM and speed, when air entering filter is being pulled more then it's being pushed at all.
I would very much like to see compared "readings" with different MAF positions.
Once more, I AGREE with you guys, it shouldn't matter!!! Perhaps in my case, something else is at play here.
I leave you with some text about MAF working that may shed some light:
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"Typical conventional mass air flow meters found in many of today's automotive systems operate on the hot wire anemometer principle. Briefly, a hot film or wire is heated by an electrical current so as to maintain a constant temperature differential between the heated element and another non-heated (i.e., at ambient temperature) element. The air flowing past the heated element removes heat from that element (with higher mass air flow removing more heat)--requiring additional electrical heating current to maintain the heated element at the constant temperature differential above ambient. A voltage differential Vout appearing across a resistor coupled (typically in series) with the heating element is measured or otherwise used to provide a direct measure of mass air flow."
"In automotive fuel management systems, it is desirable to calculate or estimate the mass of air taken into a corresponding individual combustion chamber cylinder during the intake stroke (in a Otto cycle type four-stroke internal combustion engine for example) in order to determine the amount of fuel that must be injected into that cylinder so as to provide a desired air/fuel ratio. Unfortunately, the air flow is anything but constant over an engine cycle
, but rather may be more accurately thought of as surges or pulses of air flowing into the cylinder during the time the intake valve is open."
"One technique used in the past to determine the air mass flowing into a cylinder during the intake stroke is to apply a wave form factor to the sampled air flow value. However, this technique is generally successful only if the wave shape is constant and the sample location on the wave form is known. Neither of these conditions exist in modern engines including variable valve timing. Variable valve timing control can add large variations to the mass air flow during an engine cycle. The wave shapes of these variations are not predictable, and wave shape factor and/or synchronous sampling techniques are therefore not effective to provide accurate mass air flow determinations based on more limited measurement information. To obtain the air "charge" (trapped air mass) in a cylinder combustion chamber under these circumstances, the air flow may be integrated (e.g., with respect to time) for each cylinder "event" (e.g., intake stroke) using a sufficiently large number of sufficiently high resolution samples to yield an accurate air mass determination"
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Thanks in advanced