Quote:
Originally Posted by arghx7
If the airflow reading is skewed in particular conditions, that propagates through a bunch of other calculations. These calculations include fuel trims and engine load used for enrichment scheduling. It also throws off any correction factor used to more closely align the MPG calculation with laboratory tests using fuel flow meters.
Changing anything related to the MAF or the fuel system actually skews a ton of stuff. It's not something to take lightly. The ECU is smart enough that you as a driver usually won't notice it but on a lot of platforms an intake mod is a huge deal. A lot of people remember putting an ebay cold air intake on some 90s Civic without a MAF sensor. So they don't realize how an intake change has so many implications on a modern vehicle.
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If the calculations for MPG use MAF as an input then it shouldn't matter. If the maf reads less air, it's going to use less fuel.... the speed/distance don't change.
On a very rudimentary level, say you have two identical cars traveling the same speed with the only difference being MAF reading. Car A with a richer MAF reading is going to get less MPG than Car B with a leaner MAF reading.
My point is, the MPG reading doesn't skew with the MAF, it's a reflection of the MAF skew. It's not like it's going to read 45 MPG when your car is running richer or vice versa. It's just a function of the parameters it sees, which includes the MAF sensor amongst other things. But it directly correlates to the amount of fuel being used.