1994 Pontiac Montana

I own a 2001 pontiac montana I have found a key that opens the door but the car won't start. I can't use the old key (which is lost) to check and see if it is the key that I found that doesn't work or if there is a mechanical problem with the car. Is there a key that is available for this car that would open the door, but wouldn' t have the electronic chip in it to start the car?
January 9, 2011.

Does the key you found turn the ignition switch? Does it have the chip in it?