I have made a standalone harness for a 2008 4.6 2v using crown vic ecu. I can write tunes in editor to the ECU and I can also get scanner to connect to the ECU. With the engine not running the scanner will log some things like throttle percentage and I can moniter. As soon as I fire the engine up it still shows it is logging but nothing is changing on the display anymore. Engine runs fine and it is still showing it is connected but nothing is logging. Anyone had an issue like this before? Everything works fine on other vehicles so I do not believe it is a hardware issue, unless it is the ECU itself.