The standard firing order for Nissan's 3.5-liter V6 (the VQ35 family, including DE/HR variants) is 1-6-5-4-3-2. This sequence applies to most applications such as Altima, Maxima, 350Z, Murano, and Infiniti G35, though you should verify with your model's service manual because some revisions or aftermarket parts could differ.
Engine layout and firing sequence
An overview of the VQ-series 3.5-liter V6 layout helps explain why this firing order matters. The engine uses a 60-degree V-angle with six coil-on-plug ignition units, two cylinder banks, and a central crankshaft. In Nissan's numbering, Bank 1 contains cylinders 1, 3, and 5; Bank 2 contains cylinders 2, 4, and 6. The ignition control unit pushes sparks in the sequence 1-6-5-4-3-2 to balance power pulses and minimize vibrations.
Firing order and cylinder numbering
To map the firing order for each cylinder, you can reference the following sequence and the corresponding banks. Note that the left-hand side of the engine (as viewed from the front) houses Bank 1 with cylinders 1, 3, and 5; Bank 2 on the right holds cylinders 2, 4, and 6.
- Cylinder 1 — Bank 1 (first to fire)
- Cylinder 6 — Bank 2 (second to fire)
- Cylinder 5 — Bank 1 (third)
- Cylinder 4 — Bank 2 (fourth)
- Cylinder 3 — Bank 1 (fifth)
- Cylinder 2 — Bank 2 (sixth)
The sequence 1-6-5-4-3-2 is the standard firing order used for most VQ35 engines, including DE and HR variants, across a range of models. Always confirm with your specific vehicle's manual or under-hood sticker, as production changes and aftermarket parts can alter ignition wiring.
Model-year and variant notes
Most Nissan 3.5-liter V6 variants share the same firing order, but the exact coil layout on the valve covers and the cylinder numbering scheme can vary by model year and engine revision. The VQ35DE debuted in the early 2000s, while VQ35HR updates later refined intake and exhaust flow but kept the basic firing sequence. When in doubt, consult the factory service manual or a factory-wiring diagram for your exact VIN range.
- Engine families: VQ35DE (earlier 3.5L) and VQ35HR (updated, commonly in 2007+ models)
- Typical models: Nissan Altima, Maxima, Infiniti G35/G37, 350Z, Murano, and others
In practice, the firing order remains 1-6-5-4-3-2 across these variants, but always verify against the specific engine build and model year to avoid misfires during maintenance or wiring work.
Practical checks and verification
If you’re troubleshooting misfires or performing ignition-related maintenance, verify the order with a service manual before reconnecting any coils or spark plugs. A misfiring engine can still run with incorrect coil wiring but will exhibit rough idle, reduced power, and increased emissions.
- Check the ignition coil-to-cylinder mapping on the valve cover or underside of the coil connectors.
- Cross-check the cylinder numbers with the front view and the bank designations (Bank 1 = cylinders 1,3,5; Bank 2 = 2,4,6).
- Confirm the firing order by referencing the OEM service diagram or an aftermarket repair guide for your VIN.
Once you confirm the correct order, reassemble carefully and clear any fault codes. If you’re unsure, seek a qualified mechanic or a Nissan service department for precise wiring diagrams.
Summary
The standard firing order for Nissan’s 3.5L V6 (VQ35DE/HR) is 1-6-5-4-3-2, with cylinder numbering arranged so that Bank 1 houses cylinders 1,3,5 and Bank 2 houses 2,4,6. This order is used to balance exhaust pulses and minimize engine vibration across most models, but always verify with your exact model-year manual or engine sticker.