The firing order for the 3.3-liter VG33E V6 used in older Nissan Xterra models is 1-4-2-5-3-6.
In more detail, the Xterra’s 3.3L V6 was common in models from about 2000 through 2004. The firing order determines the sequence in which spark plugs fire to ignite the air-fuel mixture in each cylinder. Getting this order right is essential for smooth idle, peak power, and overall engine reliability. If you’re diagnosing misfires or replacing ignition components, always verify the sequence against the exact service manual for your year and market, since there can be small variations or labeling differences between production runs.
Firing order for the VG33E 3.3L V6
Below is the firing sequence that applies to the VG33E V6 commonly installed in early 3.3L Xterra models. The numbers correspond to the engine’s cylinder numbering.
- 1
- 4
- 2
- 5
- 3
- 6
Note: Always verify with the official service manual for your vehicle year and market, as production changes occasionally; some Xterra models may have used a slightly different order if a revision occurred.
How to verify on your vehicle
If you are checking or replacing spark plugs, ignition coils, or a distributor-cap assembly, you can confirm the firing order by matching the rotor's alignment on the distributor cap to cylinder 1, then counting around in the sequence above. The steps below guide the check.
- Identify cylinder 1 on the engine. For Nissan V6 engines, cylinder numbers typically run 1–3 on one bank and 4–6 on the opposite bank.
- Inspect the distributor cap or coil pack layout and locate the terminal corresponding to cylinder 1.
- Count the next terminals in the firing order (1-4-2-5-3-6) around the cap in the direction of rotation.
- Verify that the rotor points to cylinder 1 when the engine is positioned so that cylinder 1 is at the spark plug firing position.
- If the order is incorrect, adjust the distributor (or replace components) to realign the firing sequence according to the above order.
After verifying or correcting, run the engine and check for a smooth idle and absence of misfires. If issues persist, seek professional service to avoid catalyst damage or further engine problems.
Summary
The 3.3-liter VG33E V6 in older Nissan Xterra models uses a firing order of 1-4-2-5-3-6. Always double-check against your specific vehicle’s service manual, year, and market, as small variations may exist. Proper firing order is essential for optimal performance and engine longevity.