I am new to this PCM. What is it? What is the PCM Flash several of you write about? I have only 15 mpg and if this flashing will up that I would be more than happy to request it.
Does anyone have a book (fixit) for the 2004 F150?

 

The PCM is one of the main computer "brains" in a vehicle. Flashing it means upgrading its built-in code with a new version, usually to fix a problem. Here's a couple of links for you from the HowStuffWorks web site:

http://auto.howstuffworks.com/car-computer.htm
http://auto.howstuffworks.com/question113.htm

 

Guys: If you have seen problems, if your truck was built around 04/04 or later, you have the latest flash... It may have even came out a little earlier...