[mwebb]

restricting air flow with dirty air filter can never change air fuel ratio and can never set a lean trim DTC
it is not even theoretically possible , you will know this when you understand what a
Mass Air Flow Sensor does

i assume you all know that the MAF sensor measures total air (mass) flow
entering the combustion chambers
that is all it does
that is all it can do
it can not do anything besides this
IF you restrict air flow to the MAF sensor , the MAF sensor will correctly report the amount of air that it measures
which just happens to be the same amount of air that the engine receives and then the ECM provides the correct amount of fuel to keep the air fuel ratio at stoich
14.64 parts air to 1 part fuel by mass

restricting air to the MAF does not change this fact
the AFR ratio will not change , at all -

assuming
the
( hypothetical / alleged )
restriction does not divert air away from or toward the MAF sensor -
and / or
does not induce turbulence in the column / cylinder of air flowing to the MAF sensor
restricting air flow has ZERO effect on mixture
therefore ZERO effect on Fuel economy
... see earlier post for explanation of possible side effects if
(hypothetically)
air is directed away from the MAF sensor by the restriction or if turbulence induced by the restriction interferes with consistent flow to the MAF sensor ....

by restricting air in
you will have reduced max available power output
nothing more
nothing less
stop this nonsense

it is obvious that the OP and some others can not comprehend this
so,
i recommend to all of those individuals ....

quit while you are behind

Originally Posted by suspectnumber961

Found on another forum posted in 2010....

"I dont know about the the wind shield.
I know that a couple of years ago, a number of folks ( myself included) experamented with just restricting the air intake. Most every car got better MPG, around 20% average. I assume that we all had some decrease in performance, but know one ever noticed or mentioned that. I did it on my sons towncar blocking about 75% we only ran it that way for a weak but one guy kept his like that for a year or more. The blocking was done away from the MAF"