The firing order for Nissan’s 3.5-liter V6 (the VQ family) is 1-2-3-4-5-6. In this layout, Bank 1 holds cylinders 1, 3, and 5, while Bank 2 holds cylinders 2, 4, and 6. This sequence is standard across most 60-degree V6 VQ engines used in models such as the 350Z, G35, Altima, and Murano.
Engine layout and cylinder numbering
The 3.5 L V6 in the VQ family is a dual overhead camshaft design with six cylinders arranged in a 60-degree V. Cylinder numbering follows a common convention: Bank 1 contains cylinders 1, 3, and 5; Bank 2 contains cylinders 2, 4, and 6. The front of the engine is typically associated with the end where cylinder 1 is located, but exact orientation can vary by vehicle. Always consult the service manual for your specific model to confirm.
Firing order sequence
The ignition sequence is the order in which the cylinders receive a spark as the crankshaft rotates. The sequence for most Nissan 3.5 L V6 engines is:
Below is the ignition sequence mapped to the engine’s cylinder numbers, showing which cylinder fires first, second, and so on.
- Cylinder 1 (Bank 1)
- Cylinder 2 (Bank 2)
- Cylinder 3 (Bank 1)
- Cylinder 4 (Bank 2)
- Cylinder 5 (Bank 1)
- Cylinder 6 (Bank 2)
The standard firing order across the VQ 3.5 L V6 is therefore 1-2-3-4-5-6, alternating between the two banks. If you have a specific model year or a variant engine code, check the official Nissan service information for any deviations.
Notes on variations and verification
While 1-2-3-4-5-6 is the common firing order for most 3.5 L VQ engines, variations can exist between model years or engine codes. Always verify against your vehicle’s service manual or a trusted Nissan parts/repair database for your exact VIN and engine code.
Maintenance implications
When replacing spark plugs, wires, or ignition coils, following the correct firing order is crucial to avoid misfires and potential engine damage. For the VQ-series 3.5 L V6, ensure ignition components are connected to the correct cylinders according to the numbering above, and consult the vehicle’s manual for torque specs and proper ignition coil seating.
Summary
In brief, Nissan’s 3.5 L V6 (VQ family) uses a firing order of 1-2-3-4-5-6, with Bank 1 containing cylinders 1, 3, and 5 and Bank 2 containing cylinders 2, 4, and 6. This sequence is standard across the majority of VQ 3.5 L applications, but owners should confirm with their specific model year’s documentation to account for any minor variations.