Lost power while Shifting on the Fly
 

Anyone ever have this happen to them?

I pulled over to the side of the road to try to restart the engine, the only way it would start was to recycle the ignition key then it ran fine again.

My emissions and battery light came on when the truck quit.

Anyone have any ideas? The truck is a 2003 7.3 with a A.T. :shrug:

I see alot of people that seem to have the same problem. I know thats not much help but mabye it will make you feel a bit better. I'd also like to know why this happens.:woot:

This seems to be an older thread but I'll see if I can get Cody to explain.

There are times that the PCM may be looking up a certain operating parameter from the memory right at the very instant that the chip calibration is changed. It doesn't really happen that often, surprisingly. It's not going to hurt anything when it happens, but it does happen occasionally. The newer trucks are more prone to it than the older ones only because there are far more things going on in at any given time with the newer ones. Consequently, if there does happen to be an interruption in the data fetching, the PCM says "What the ****?" and shuts down. Sometimes, if it's a recoverable error, the truck will simply hiccup and be on it's merry way. Other times, the PCM will not allow a quick reboot and shut the truck off completely. This is why it's better to switch the positions on the chip while coasting....there are very few things "going on" inside the PCM on a deceleration event.



Keep on truckin'!