Finding out Fuel Consumption.

[Brian Warburton, c/o Turbo Systems Ltd]

>I am currently doing a microprocessor project using an 8051.
>What I am building is a simple Fuel / Trip computer.
>
>I have a 1993 Ford Thunderbird with a 5.0H.O. engine.  Someone told me =
>that Pin 34 on the EEC computer relates to how long the fuel injector is =
>open.

Almost the right answer, but wrong enough to waste you a lot of
time assuming that NAAO (North American Automotive Operations)
trip-minders work the same as FOE (Ford of Europe) ones. 

In FOE, pin 34 outputs a series of pulses which relates to fuel
consumption. The relationship tho' is the number of pulses not the
pulse width. It used to be either 6000 or 8000 pulses to the (euro)
gallon, but that's something that can easily be determined by
testing (i.e. fill the tank and count up the pulses while
waiting for the fuel to run out). 


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Brian Warburton,   "Still searching for the perfect curve....."
email: bwarb at turbo.win-uk.net
                               Advanced Automotive Electronics Ltd,
                               Van-Nuys House, Scotlands Drive,
                               Farnham Common, England.  SL2-3ES
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