The firing order for this engine is 1-6-5-4-3-2. This sequence determines the order in which each cylinder fires its spark plug during operation.
On the 2007 CTS, the 2.8-liter V6 uses a distributorless ignition system with coil-on-plug coils. The firing order is a fixed sequence for proper timing and engine performance, and it is typically consistent across production examples of this engine family. Correctly following this order is important when diagnosing misfires or replacing ignition components.
What the firing order means
The firing order is the sequence in which the engine's ignition events occur. For a six-cylinder V6, this pattern helps maintain smooth operation, reduce vibrations, and optimize power delivery. When servicing spark plugs, ignition coils, or related wiring, adhering to the correct order prevents timing errors that can cause rough running or misfires.
Firing order for the 2007 CTS 2.8L V6
Use the sequence below when verifying timing or wiring ignition components. The order corresponds to the cylinder numbering used on GM's 60-degree V6 layout.
- Cylinder 1
- Cylinder 6
- Cylinder 5
- Cylinder 4
- Cylinder 3
- Cylinder 2
This pattern is typical for the GM 60-degree V6 family and applies to the 2.8L V6 in the CTS from this era. Always confirm with the factory service manual or a VIN-specific guide if you’re uncertain about your particular vehicle.
Notes and practical tips
When performing ignition work, disconnect the battery and relieve fuel pressure before removing plugs or coils. If your engine uses coil-on-plug ignition, each cylinder has its own coil; the firing order dictates the sequence you should test or replace coils and plugs in, and which cylinder to observe first when diagnosing a misfire.
Summary: The 2007 Cadillac CTS 2.8L V6 follows a 1-6-5-4-3-2 firing order. Verifying this sequence helps with accurate ignition component replacement, timing checks, and proper engine diagnostics. Refer to the official service manual for confirmation specific to your VIN and production date.