Picture of firing order for a 2003 Oldsmobile alero?

The firing order for a 2003 Oldsmobile Alero with a 3.4L V6 engine is 1-6-5-4-3-2. This means that the spark plugs fire in the following order:

1. Spark plug 1

2. Spark plug 6

3. Spark plug 5

4. Spark plug 4

5. Spark plug 3

6. Spark plug 2

The firing order is important because it ensures that the engine runs smoothly. If the firing order is incorrect, the engine may misfire or run rough.