The addition of the fluid injection feature to enhance the performance of the turbocharger introduced a degree of complexity. This resulted in extensive service problems, which caused the life of the Jetfire to end after two years of production. Few Jetfires still have operational turbos. Many have been converted to four-barrel carburetors.
For further insight as to why Olds stopped using the turbo setup, after two years, see: http://auto.howstuffworks.com/1962-1963-oldsmobile-f85-jetfire6.htm