Does 1999 pontiac grand am 4-cylinder have a timing belt or chain and when should it be replaced?

The 1999 Pontiac Grand Am 4-cylinder engine uses a timing chain instead of a timing belt.

Timing Chain Replacement:

Timing chains generally do not require replacement unless there's a problem or excessive wear. Under normal driving conditions, timing chains can last for the entire lifespan of the vehicle. However, if you experience any issues with the timing system, such as unusual engine noises or check engine light related to timing, it is recommended to consult with a qualified mechanic.