Here is the firing order and spark plug wire routing diagram for a 2006 Chevy Impala LT 3.9 V6:
Firing order: 1-2-3-4-5-6
Spark plug wire routing (starting from the driver's side):
- Cylinder 1: connect to the coil tower closest to the driver's side headlight
- Cylinder 3: connect to the coil tower next to cylinder 1
- Cylinder 5: connect to the coil tower next to cylinder 3
- Cylinder 2: connect to the coil tower closest to the passenger side headlight
- Cylinder 4: connect to the coil tower next to cylinder 2
- Cylinder 6: connect to the coil tower next to cylinder 4
Note: Make sure to route the wires properly to avoid cross-firing.
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