Originally Posted by dracowing14
I know it's called a mass air flow sensor but what exactly does it do and if it's dirty how would it affect my performance. ....
Good reading here (clicky
Long and short of it is that air/fuel ratios are calculated based on weights (mass), the MAF sensor works the front end of "how much air" your engine is drawing in -- Base tables work the efficiencies and other temperature sensors provide data for the expansion (reduction in mass-per-volume as the inbound air expands a bit). Injectors are controlled to flow a fixed rate (controlled by the time that the injector is open -- you may have seen injector ratings like 19lbs/hour...)
Read, then clean your MAF regularly (especially with an oiled air filter) with a good MAF cleaner spray
Originally Posted by Marchy
My MAF is held on by a strange screw, it looks like a star with a point in the middle? Any idea what the best way to remove it is as mine is due for a cleaning.
It's a security torx... not strange, just different