I'm getting my excursion ready to sell (2wd XLT) and as part of the process, went to a shop last week to get some new keys programmed and a smog check.
Everything went fine with the keys and smog, but I was required to remove my DP tuner (10 month old F5 unit, custom tuned for my ecu) before going to the shop so it would pass the visual check.
When i re-installed the tuner module this morning, the "Theft" light was rapidly flashing and the engine would not start, just kept turning over. I tried a few times. One time, I did unplug just the module, turned the ignition on, off, and plugged the module back in, and it started. But then it died 30 seconds later, and each subsequent attempt was similar to the very first. No check engine light or codes.
I ended up removing it entirely, and have no problems.
I have done a little searching, and came up with a couple potential fixes. one here: 2000 excursion wont start with tuner - TheDieselGarage.com
, where the OP said "When you install a tuner on an excursion with the PATS system it needs to reset.. After the tuner is installed and you turn the ignition off you need to turn the ignition back on....... the theft light flashes rapidly for about a minute and will stop...turn the key off then back on and the theft light will turn on as usual. PATS reset and truck starts and runs like a champ. "
Somebody here: Problem after installing DP-Tuner PCM - Ford Truck Enthusiasts Forums
said something similar, "I had this with the superchips on my 01 Ex. It is caused by the PATS and what you should try is to turn the key on and wait (1-2 minutes) until the flashing slows down or stops. Then turn ignition off. Then turn ignition back on and the light should flash slowly (normally) and you should be able to crank. This is printed in the SC manual for vehicles with PATS like ours."
Does this sound like it might fix the problem? I have emailed Jody, but of course, he doesn't work Friday-Sunday.
Thanks for the input.