When the truck was new all the numbers in the computer were set to factory
standard. The computer is supposed to change the numbers as the truck ages
to compensate for some wear and still give peak efficiency and low
emissions. When you shut off the truck the battery keeps the memory alive,
just like the battery in your computer keeps the date and type of disk
drive alive in memory. But on a car if you disconnect the battery the
numbers are lost and get set back to the factory defaults which are burned
into special memory. Usually the manual says if you drive the car 20 miles
after reconnecting the battery the computer will build up new numbers
again and the engine will run smoothly. I don't know if that's still true
for all numbers on all cars.

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