I am working on a 2005 F-150 with a 5.4L 3V engine. I had the battery disconnected doing some other work and now the Evap monitor will not complete and keep getting a P1000

I have followed the drive cycle instructions and all the monitors have completed except the Evap monitor.
Ford Motor Company Driving Cycle

any ideas what would cause it to fail?

 

The EVAP monitor is very finicky about when it runs. It might take days, weeks, or even months for it to run, depending on your local driving conditions.

It's not failing, it just hasn't run yet. This is usually not a problem.

 

Guess I keep driving it and hope the monitor runs.

 

How much fuel is in the tank?

 

Unless you have an impending emissions test, don't worry about it. Even then, most jurisdictions allow one or two incomplete monitors, check local regulations.

Download a copy of the OBDII book for 2005 at http://www.motorcraftservice.com/vdi...f/OBDSM508.pdf The EVAP testing section starts on page 15 and runs for 20 pages.