Hey watson, I don't know about the sulphur thing, maybe true, but removing the key does work. My old 05 did it, my 07 does, my wifes 08 fusion, her old 05 explorer, her 03 escape and the old 00 focus. Just shutting off the truck is not enough, you actually have to phyically remove the key from the ignition switch.
Current ride 2013 FX4 screw 5.5' 402A 5.0 on factory 20's in Blue Flame
Wifes ride 2013 escape titanium FWD 401A in Frosted Glass
Daughters ride 2013 focus SE 201A in Performance Blue
Other daughters ride 2014 fusion SE 200A in Dark Side