This is a large job and requires a manual, and removal of the engine from the car to do properly.
It does not have a timing belt, it has a timing chain that requires no maintenance.
The 2004 2.0 liter Pontiac Grand Am does not have a timing belt, but instead has a timing chain which requires no maintenance.
It has a timing chain.
Timing chain
You can replace a timing chain on a 2002 Pontiac Sunfire by visiting a local mechanic and having him take care of it for you. This is a tricky part to change yourself.
The 2008 Pontiac G6 has a timing chain that normally requires no maintenance.
It has a timing chain.
TIMING CHAIN
a timing chain
The ( 3.4 liter V6 ) in a 2004 Pontiac Grand Am has a timing CHAIN
chain
there is no timing belt on these vehicles! only one chain, and there(supposed) to LAST.