In most configurations, the Commander uses either six or eight spark plugs, depending on the engine installed. Specifically, the 3.7-liter V6 uses six spark plugs, while both V8 options—the 4.7-liter and the 5.7-liter Hemi—use eight spark plugs.
The 2007 Commander offered several powertrains, so the exact number on a given vehicle depends on the engine it shipped with. Identifying the engine code or checking the vehicle's documentation will confirm the precise count.
Engine options and spark plug counts
Below is a quick mapping of the engines available for the 2007 Jeep Commander and how many spark plugs each engine requires.
- 3.7L PowerTech V6 — 6 spark plugs (one per cylinder across six cylinders).
- 4.7L PowerTech V8 — 8 spark plugs (one per cylinder across eight cylinders).
- 5.7L Hemi V8 — 8 spark plugs (one per cylinder across eight cylinders).
In short, the spark plug count on a 2007 Commander depends on the engine installed: six with the 3.7L V6, or eight with either of the V8 options. To verify for a specific vehicle, check the engine designation on the VIN sticker or owner's manual.
Summary
The 2007 Jeep Commander uses either six or eight spark plugs, determined by engine choice: 6 for the 3.7L V6 and 8 for the 4.7L V8 or 5.7L Hemi V8. Knowing the exact engine is the surest way to confirm the spark plug count.