Captain Sim wrote on Dec 16^th, 2010 at 3:57pm:

You can start engines short way (using FSX hotkeys) of a long way (using cockpit controls), whatever it is but fuel cutoff must be OFF (Ctrl+Shift+F4) and trottle at IDLE (F1) BEFORE ignition. Again, most likely all issues mentioned here have been caused by wrong throttle/fuel cutoff valve positions.

still not working,by doing ur magic formula u just ear fake engine start and the sound is just glitchy,u always think ohhh ohhh its gonna start and no the sound start again even on 128time faster no result