A little late to the game here I know, but, one of my first e-cigs was a 901 auto. IMHO, it was a real PITA.
To get any vape, I had to kind of 'play' the vent hole on the Atty like flute. Flutter my finger on it while I sucked it. Close the vent hole completely and you would suck your eyeballs into your head. But if you just flutter your finger around the air vent on the Atty, it would produce a nice hit. HTH
GB
PS - Love 901 Attys on mods, just not so good on stock auto battery's.