At 04:27 PM 7/5/2014, Neil N wrote:
>You know more than I David but with Bosch Motronic 2.9 (and OBD2 as
>well), there is an intake air sensor mounted post MAF in intake
>plenum.

You've actually had your hands on one, I think that trumps me a good
deal. ;-)  And using a temp sender is the obvious thing to do as you
can actually calculate the delta-T instead of trying to swamp the errors.

>Mortonic 2.9 ECU uses both IAT sensor and MAF for same or similar
>purpose as does the WBX AFM?
>
>I don't know if the "hot wire" in the MAF I'm running gets as hot as
>the Platinum part you refer to, but duly noted in terms of cleaning.
>There's lots of threads in Mk3 forums re: MAF's getting oil fouled.

About the only other thing I think I remember from this study back
when MAFs were fairly new (this might have been a Subaru one?) --
anyway, I have a distinct impression that they mentioned that at that
time the predominant cause of MAF failure was techs or owners trying
to clean them and busting the wire.  I offer this for entertainment
purposes only, so to speak.

d