Not sure I fully understand just what you mean with the key turned backwards, but
It would seem the only thing that is changed when they work and when they don't is, the possible travel of the ignition tumbler and the position it indexes with the ignition switch. Strange things can and do happen when electrical contacts are involved.
Don't know if this is the problem, but a possible adjustment of the ign switch position on the column might be the solution.
Does this vehicle have a coded key and vehicle security system?
Last edited by hanky; 05-19-2013 at 09:36 AM.