The standard firing order for Nissan’s 3.5-liter V6 engines in the VQ family is 1-2-3-4-5-6, with Bank 1 consisting of cylinders 1-3-5 and Bank 2 consisting of cylinders 2-4-6. This arrangement is typical across the common VQ35DE and VQ35HR variants used in a range of Nissan and Infiniti models.
How the firing order is structured
The firing order is the sequence in which each spark plug fires in relation to the engine crankshaft’s rotation. On a 3.5L V6, the sequence alternates between the two banks to balance power delivery and minimize vibration. In practice, the engine fires in the order 1, then 2, then 3, 4, 5, and 6 as the crank completes a full 720-degree cycle.
Cylinder layout and numbering
Bank 1 contains cylinders 1, 3, and 5, while Bank 2 contains cylinders 2, 4, and 6. The firing sequence of 1-2-3-4-5-6 means the left bank fires in the 1-3-5 order and the right bank fires in the 2-4-6 order, with each successive cylinder firing as the crank rotates. This pattern applies to both the VQ35DE and VQ35HR variants used in Nissan and Infiniti vehicles from the early 2000s through the mid-2010s.
Models and applications
These engines power a variety of Nissan and Infiniti models that used the 3.5L V6. Notable examples include the 350Z and Infiniti G35 from the early 2000s, the Altima, Maxima, Murano, and FX35 from the mid-to-late 2000s, and related Infiniti models that utilized the VQ35 family during that era. If you’re unsure about your specific model year, consult the vehicle’s service manual or a trusted dealership bulletin to confirm the firing order and cylinder numbering for your engine variant.
Maintenance and verification tips
When replacing spark plugs, ignition coils, or wires, verify the correct cylinder-to-wire mapping against the factory diagram. An incorrect connection can cause misfires, rough running, or reduced performance. If your engine is misfiring or running poorly, a check of plug leads and coil pack connections against the 1-2-3-4-5-6 firing order can help pinpoint the issue. For precision, refer to the specific service manual for your model year and trim, since there can be minor variations between VQ35DE and VQ35HR versions.
Summary
The Nissan 3.5L V6 uses a 1-2-3-4-5-6 firing order, with Bank 1 cylinders 1-3-5 and Bank 2 cylinders 2-4-6. This alternating sequence helps balance the engine and is common to the VQ35DE and VQ35HR variants found in a broad set of Nissan and Infiniti models from the early 2000s through the mid-2010s. Always verify the exact variant and year against your vehicle’s manual when performing maintenance involving spark plugs or ignition wiring.