Sounds like the IAC to me.... Take it out and clean it. New ones are cheap but cleaning usually works. http://www.google.com/url?sa=t&rct=j...k0XCvjay68AnLQ Here is a link...

 

Looking for concrete ( physically correct) location of Inertia / Fuel Cutoff Switch on 2000 Ford Excursion, XLT, 2WD (RWD), 5.4L Gasoline Engine, V.I.N. Engine Type L. 3 Internet searches revealed 3 different locations. Any help much appreciated. Merry X-Mas and God Bless You & Yours!!

 

I'd vote for the IAC as well. Press down the accelerator pedal some when cranking it and see if it starts.

 

I'm thinking since this thread is over two years old, the OP probably got it started by now.

Stewart

 

It is located Behind RH (passenger side) cowl panel.

 

Picture below (not the connector with the blue arrow) but the other one on the right side of the passenger panel. This is with the trim panel removed so you can see it easily.

 

I know this tread is old, but I have been searching through everything looking for a fix to my Excursion suddenly not starting, here was my fix:

It was my key! If you have a second key, or generic key, it might be the actual key you are using. It's worth a shot!

I just spent my entire Memorial Weekend Friday troubleshooting why my 2001 6.8L Limited Excursion will suddenly not start! It would only crank, like it was out of gas. Battery is strong.

Two years ago I had to replace the fuel pump and it's acting that way again!

I have tried listening for the fuel pump while turning the ignition on but only hear a slight mechanical "mmmm relentt" sound that lasts maybe .5 of a second.

I bit the bullet, dropped the tank and replaced the fuel filter inside the gas tank BY MYSELF (quite proud of that) but very frustrating to get it all back together 5 hours later and STILL NOTHING!!

I couple of years ago, we had Lowes cut us a chipped key. It does not get used often but I was using it today when I tired to pull my car out of the garage.

Now, I can sit in the car, the Lowes key will crank, but not fire and the original key will start it every time!

I hope your fix is as easy! This car has 160,000 and runs like a champ

I needed to spread the good news.

 

If you had a defective PATS key, the flashing red THEFT light should have clued you into what was happening. Why did you waste all that time doing other stuff when the key (pun!) to the problem was flashing right in front of you?