I have a friend who works on diesel trucks. He once showed me exactly what the diagnostic computer can do. This computer could change the idle level of the engine, it could even accelerate the engine as if someone was pushing down on the gas pedal. One thing that was a little scary is that computer kept a log of how the truck was driven (idle time, shifting habits, speeds, etc.)
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I have a friend who works on diesel trucks. He once showed me exactly what the diagnostic computer can do. This computer could change the idle level of the engine, it could even accelerate the engine as if someone was pushing down on the gas pedal. One thing that was a little scary is that computer kept a log of how the truck was driven (idle time, shifting habits, speeds, etc.)