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What is the firing order for a 2003 Pontiac Bonneville?

The 2003 Pontiac Bonneville, depending on the engine, has one of two firing orders:

* 3.8L V6: 1-6-5-4-3-2

* 3.8L Supercharged V6: 1-6-5-4-3-2

While there were different versions of the 3.8L engine, the firing order remained consistent. Always double-check your specific engine displacement before relying on this information for any maintenance or repair. Your engine block should have the firing order stamped on it as well.