[merrylander]

Originally Posted by finnbow

The detente spring is the spring that holds the key's position in the desired place. GM (actually AC Delco) put too short a spring in the ignition switch and it thereby put too little force behind the plunger that goes into the little divots that keep the key in its chosen position.

These aren't newfangled ignition switches. They are the same basic design as has been used for a half a century.

http://online.wsj.com/news/articles/...35171004763740

Then how come our Impalas don't have this problem if it is a common switch used throughout?