I just installed my diablo delta 2 chip in my 2002 F150 5.4L.
I drove it to work today for the first time (70miles roundtrip).
I left in stock mode but I had a full tank of 93+Mobil fuel. I had no issues.
When I got home I flipped the switch to the center (Premium Fuel), Truck started fine, I was driving for towards the highway on a side street (2minutes into the drive) I tapped the gas quickly and let go, the RPMs went from 700 to 2000 in two short burts...then 10seconds later the Trucks stalls. I pulled the truck over into a side street (Whew) and tried starting the truck again...the theft light is blinking and it won't turn over. I then flipped the switch back to Stock mode...still won't start. I had to remove the chip to get my truck to start up.
Any help would be appreciated.
Brian Pierce

 

Okay, first thing is to reclean the connector use acetone or nail polish remover. 99% chip problems are caused by connector issues. Either of these two chemicals will take off the conformal coating on the connector with no scrubbing. Then, funny as this sounds, secure the chip with duct tape. Its what I've always used and I recommend it to my customers as well.