I have found that a Chilton or Haynes Auto repair manual for the year and make of the vehicle (available at your local library)are an excellent source of information. They are quite informative on most parts replacement and how to troubleshoot.
Possible switch or lock cylinder
How to change an air filter in a 2001 Grand Prix.
the ign switch or the key & tumbler ???
Give more detail what year of grand prix do you have what model grand prix do you have what is the engine size does it have abs
wierd ones
dude...change the ecm and get it over with
The Pontiac Grand Am is more of a budget model, with a less powerful 4 cylinder engine and a shorter wheelbase. The Grand Prix is like a more deluxe Grand Am, with a more powerful 6 cylinder engine, and more room.
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2006 Pontiac grand prix recurring number 4 cylinder misfire diagnostic code? What could it be?
how do you change the low beam head lamp on a 2006 grand prix?
Cylinder head gasket torque specs on 2003 Pontiac Grand Prix 3.1 L V-6
Had the same problem with my Grand Prix, ended up that the ignition switch had to be replaced. Hope this helps.