The firing order is 1-8-7-2-6-5-4-3.
The 2013 Infiniti QX56 relies on a 5.6-liter V8 engine from Nissan’s VK56 family. Understanding the firing order helps with diagnosing misfires, installing ignition components, and routing spark plug wires correctly. This article explains the firing order for this model, why it matters, and how to verify it on your vehicle.
Firing order for the 5.6L V8 (VK56 family)
The 2013 QX56 uses Nissan's VK56 family 5.6L V8. To ensure smooth operation, ignition events follow a fixed sequence across the engine's two banks.
The following is the firing sequence used by the VK56V8 in the 2013 QX56:
- 1
- 8
- 7
- 2
- 6
- 5
- 4
- 3
This firing order distributes power evenly between the two cylinder banks and minimizes engine vibration. Always confirm with the factory service manual for your exact VIN as tuning or revisions may apply.
Verification and notes
It's important to verify with the official service documentation for your vehicle, as there can be minor variations by year or engine revision. If wiring is being replaced, follow the OEM diagram or cylinder-to-wire mapping to ensure correct routing and avoid misfires.
If you are diagnosing misfires or performing ignition work, consider these steps:
- Check for diagnostic trouble codes with an OBD-II scanner.
- Inspect spark plugs and ignition coils for wear; replace as needed.
- Verify spark plug wires follow the firing order exactly and are routed away from heat sources.
- Check for vacuum leaks or issues in the fuel delivery system that can mimic misfires.
Note: The firing order is essential for ignition sequencing, but other engine issues can mimic misfire symptoms.
Summary
The 2013 Infiniti QX56’s 5.6L V8 fires in the sequence 1-8-7-2-6-5-4-3. This order should be confirmed with the official service documentation for your vehicle and followed when replacing spark plug wires or ignition components. Properly aligning the firing order helps ensure smooth operation, reduces vibrations, and minimizes the risk of misfires.