The standard ignition sequence for most Nissan V6 engines in the VQ family is 1-2-3-4-5-6, with left-bank cylinders labeled 1-3-5 and right-bank cylinders labeled 2-4-6.
The precise firing order can vary by model and production year, and some variants may have minor engineering changes that affect the ignition sequence. This article explains the general layout, why it matters for maintenance, and how to verify the order on your specific engine.
Understanding the V6 layout
Nissan’s current V6 lineup uses a compact 60-degree V-angle configuration. The engine is split into two banks of three cylinders. In most reference schemes, front-left is cylinder 1, front-right is cylinder 2, and the numbering continues rearward along each bank (3 on the left, 4 on the right, then 5 on the left rear and 6 on the right rear). The firing order typically alternates between banks to balance power and vibration, with 1-2-3-4-5-6 being the common sequence for many VQ-series engines.
Model specifics
Here are the VQ-series Nissan V6 engines where you’ll commonly encounter this firing order, though it’s always best to consult the exact factory manual for your year and model:
- VQ35DE (3.5L, used in 350Z, G35/Infiniti, Maxima, Altima, and others): firing order 1-2-3-4-5-6
- VQ37VHR (3.7L, used in 370Z, G37, Q50, Q70, and related models): firing order 1-2-3-4-5-6
- VQ35HR (3.5L high-rev variant): firing order 1-2-3-4-5-6
Note: While these engines share the same general layout and firing sequence, there can be variations due to specific year updates, valve timing changes, or mounting configurations. Always verify with the official service manual for your exact vehicle and production year.
Why the firing order matters
Correct firing order ensures smooth engine operation, balanced power delivery between banks, and reduced vibration. It also guides maintenance tasks like spark plug and ignition coil replacement; wiring a coil or plug out of order can lead to misfires or reduced performance. When in doubt, consult the vehicle’s service documentation to confirm the sequence for your exact engine.
Summary
In most Nissan V6 engines in the VQ family, the standard firing order is 1-2-3-4-5-6, with left-bank cylinders 1-3-5 and right-bank cylinders 2-4-6. Always confirm the order for your specific model and year using the factory manuals or a reliable repair guide, as there can be variations among variants and production updates.