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Old 05-17-2008, 10:51 AM   #7 (permalink)
EcoModding Apprentice
Join Date: May 2008
Location: South Dakota
Posts: 117

GMC Sonoma - '94 GMC Sonoma
90 day: 36.97 mpg (US)
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Originally Posted by JohnnyGrey View Post
This is the "Iron Duke" not the "2200", correct?
I guess I don't have any knowledge of either of these you mentioned. I am referring to my GMC Sonoma 2.2L 4 cyl.

Anyway, I just finished building a little fuel injector monitor which I can now use to visually monitor exactly how much time the injectors are injecting fuel. It has 10 LEDs, each one representing an injector ON time of approximately 2.3% of total time.It was very interesting to learn how much a higher gear reduced fuel consumption. I have been driving in too low of a gear climbing hills. I have always thought that pressing the accelerator pedal down further, as required in higher gears, was worse for mileage, but I am surprised to see how that is not quite true.

My LED monitor just converts the pulses from the injectors to a voltage which the LEDs correspond to.
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Last edited by Gregte; 05-17-2008 at 11:17 AM..
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