During deceleration after a recent WOT run the engine stalled and would not start, behaving as if flooded. With the key on, audible rapid clicking of either, or both, of the precontrol and wastegate solenoids was present but no go !

The commander sensor/switch display showed the PIM sensor at 4.9V.

Assuming the MAP sensor was bad I replaced it without any result. All other sensors read in range. After removing the PFC and replacing with the stock ECU the engine fired and ran. It has been suggested that the PFC has a bad internal ground to the MAP sensor causing this problem.

As the "generous" 3 month warranty from APEX is long expired I am interested in anyones' opinion on the validity of this diagnosis, other ideas, and possible fixes prior to shelling out for a new PFC.

No other interim changes have been made to the car other than the addition of a datalogit and wideband meter since the installation of the PFC 7 months ago.

Help resurrect the PFC!

 

Try installing again and check the PIM voltage. Even my home PC gets confused sometimes and has to be rebooted!

If still bad PIM, then it is hosed.

 

I hate to be the one to bring this to you, but your Power FC is definitely fried. I had the exact same thing happen to me a month ago. I also had the rapid clicking of the boost control solenoids and all the voltages from the sensors did read around 4.9V. My car also flooded when I tried to start it up. I think I may have accidentely crossed some wires while the battery was still connected. I ended up having to purchase a new unit.