This is the final cut on the mass air flow sensor calibration
plate on my 1994 Cougar 4.6L V8 electronic fuel injection.

The one on the right is the stock plate and the one on
the left is the final homemade cut down plate. This
was cut in stages to see what effect if any it had
on the way the engine ran.

You need to look at the last picture I uploaded on this
subject to get an idea where this plate goes.

This made no real difference in the way the engine ran.
The engine ran ruf when I start it up but it settles
down within 30 seconds and runs exactly the same.

This illustrates the power of a closed loop feedback system.
Apparently the engine computer reads the o2 sensors and that 
is all it cares about. It would probably start and run without a
mass air flow sensor. A guy from Ford says there are limits
to the compensation in the feedback loop. The computer knows 
these limits and if they are exceeded it considers the O2 
sensor to have failed. It signals this indirectly by
sending a code "bank too lean".

Some day someone will build a closed loop aircraft fuel 
injection that will take its information from the ultimate
combustion sensor. Mainly exhaust gas temperature.

BTW Speaking of that, Tracy, I have a new feature for you.
Since you are measuring intake manifold temperature why
don't you display that in the cockpit along with MPG
so people can calculate the true airspeed?
Saves installing and outside air temperature gauge.

efiplate.jpg
 
Paul Lamar
 
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