Infiniti QX4 3.5L Engine

Engine Overview: Infiniti QX4 3.5L Engine (VQ35DE)

The Infiniti QX4 3.5L Engine (1996–2003) offered two main V6 engine options:

• VG33E: A 3.3 L SOHC V6 (3275 cc), used in earlier models (1997–2000). Known for cast-iron block durability but lower power.

• VQ35DE: A more modern 3.5 L DOHC aluminum V6, introduced in 2001 for the QX4’s remaining years (2001–2003). This is the usual choice when sourcing a “3.5 L engine” for QX4 models.

The Infiniti QX4 3.5L Engine stands out for its lighter construction, improved power, timing chain (vs. belt), and broader usage across Nissan/Infiniti models.

 Where to Buy: Current Market Listings

Here’s what online marketplaces—especially are offering as of mid‑2025:

•  Listings

  • JDM 2001–2004 Nissan Pathfinder / 2001–2003 Infiniti QX4 3.5 L VQ35DE Motor – $1,699; free shipping.

  • Engine 3.5 L VIN D 4th Digit VQ35DE (2001–02 QX4) – ranges from $599 (plus shipping) to $1,150–1,620, depending on warranty length and seller.

  • Complete Engine Assembly fits: 2002 QX4 3.5 L VIN D – around $629.60 (discounted from $787), free shipping, 6‑month warranty.

• Genuine OEM & JDM Options

  • 96–00 Pathfinder / 99–04 Frontier / 97–00 QX4 3.3 L VG33 Engine – about $1,699.

  • Engine 3.5 L VIN D VQ35DE, QX4 (used) – around $1,150 to $1,700, depending on model year and warranty.

Price Range Summary

 Which Engine Suits You Best?

a) Infiniti QX4 3.5L Engine (3.5 L, DOHC)

• Pros:

  • Lightweight aluminum design

  • Timing chain (lower maintenance than belt)

  • Better performance and compatibility with 2001–03 QX4s

• Cons:

  • Slightly more expensive than VG33E used units

  • Requires VIN matching (VIN D in 4th digit) for some builds

b) VG33E (3.3 L, SOHC)

• Pros:

  • Often cheaper or available as JDM replacements

  • Simpler cast‑iron construction

• Cons:

  • Lower power output

  • May not directly interchange depending on specific model year details

 Reliability & Common Issues

While the VQ35DE is generally dependable, there are points to watch:

• Reddit Experience – Coolant in Oil & Gasket Failures
  A user shared:

• Difficulty Removing Engine
  One comment notes:

  Another user mentioned QX7I (?) engine swap knowledge but reinforce that such jobs may require professional shops.

Bottom Line: If you’re buying used, prioritize listings with compression-tested engines, inspection details, and at least a short-term warranty.

Tips for Buying a Infiniti QX4 3.5L Engine

Evaluate Listings Carefully

• Mileage / Hours: lower mileage is generally better.

• Condition: “compression tested” / “runs great” are helpful indicators.

• Warranty: 30‑day to 6‑month warranties offer peace of mind.

• Shipping: Free residential shipping or clearly stated costs—especially for long blocks—matters.

VIN and Year Fitment

Ensure the engine’s VIN format and physical shape match your QX4 year (2001–2003 for Infiniti QX4 3.5L Engine). The “VIN D 4th digit” is often mentioned in listings

Consider Core Charges

Some engines listed as “core short block” indicate they may require you to return your old core for a discount or full functionality

Account for Removal & Installation Costs

Given the complexity of dropping the engine and trans together, many owners opt for professional installation. Factor in labor, tools (hoist, lift), and possible extras like timing cover replacements.

Explore Alternatives Infiniti QX4 3.5L Engine

If mainstream marketplaces fall short, try local junkyards, engine rebuilders, or specialized importers for VG33E or Infiniti QX4 3.5L Engine blocks.

 Example Listings to Consider

• Budget Option (~$600–700):
  Used Engine Assembly, 2002 QX4 3.5 L VIN D — $629.60, free shipping, 6-month warranty.

• Mid-Range (~$900–1,100):
  Engine 3.5 L VIN D Infiniti QX4 3.5L Engine for 2001–02 QX4 — around $900–$1,150, often compression-tested.

• Premium / OEM (~$1,500–1,700):
  JDM 2001–2004 Pathfinder / 2001–2003 QX4 VQ35DE — $1,699, may include robust shipping and OEM coverage.

• VG33E Alternative (~$1,499–1,699):
  JDM VG33E — ~ $1,500+, useful if you’re on a tight budget or don’t require 3.5 L performance.

 Installation & Post-Installation Advice

1. Drain fluids (oil, coolant), disconnect battery, remove drive belts, radiator, accessories.

2. Remove engine and trans as a unit, typically requiring lifting from below.

3. Inspect: Clean and inspect engine bay, transmission mounts, lines.

4. Install: Reinstall engine + trans, reconnect everything including sensors, electronics.

5. Fill fluids: Use manufacturer specs for oil, transmission fluid, coolant.

6. Programming / Reset: Since the QX4 is older, extensive ECU programming likely isn’t needed—but reset the ECU and idle adaptation.

7. Test drive: Monitor for leaks, check engine light, test drive before warranty expires.

 Cost Estimate (2025)

• Engine Purchase: $600 – $1,700

• Shipping: Often free, but budget $200–500 if not

• Labor: $1,500 – $3,000 depending on shop and region (complex drop includes trans)

• Undercarriage fluids & parts: ~$100 – $300 (coolant, gaskets, etc.)

Estimated Total:

• DIY low-end: ~$600

• Full professional with mid-range engine: ~$2,500 – $4,500

• High-end/expert rebuild or OEM swap: $4,000+

Final Recommendations

• If seeking value, start with the $629–700 compression-tested Infiniti QX4 3.5L Engine long‑block with warranty.

• If aiming for reliability & OEM, the JDM Infiniti QX4 3.5L Engine option at $1,699 may offer better brains (and perhaps more recent condition).

• Always check who-the-seller is, read reviews, and ask for details or test videos before committing.

• Be prepared for installation complexity—plan for a professional shop if unsure.

• Remember to secure proper fluids, gaskets, and tune/reset after installation.

Let me know if you’d like help narrowing listings by year, mileage, or location—or if you’d like installation guidance based on local resources!