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Infiniti Q45

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Infiniti Q45: A Comprehensive Guide

The Infiniti Q45 was the flagship sedan of Nissan's Infiniti division, produced from 1989 to 2006. Aimed at competing with established luxury brands like BMW, Mercedes-Benz, and Lexus, the Q45 offered a unique blend of Japanese engineering, luxury features, and distinctive styling. Positioned as a full-size luxury sedan, it targeted discerning buyers seeking a sophisticated and powerful alternative to traditional European and American offerings.

Generations

First Generation (1990-1996, G50)

The first-generation Q45, known as the G50, was a bold statement from Infiniti. Key features included:

  • Engine: 4.5-liter VH45DE V8 engine producing 278 hp.
  • Styling: A minimalist design with a controversial lack of a traditional grille. Often referred to as the "chrome emblem" or "smiley face" design.
  • Features: Advanced features for its time, including automatic climate control, leather upholstery, power seats, and an optional Active Suspension System.
  • Changes: Minor updates occurred throughout the generation. The 1994 model year saw some revisions to the interior and exterior trim.

Second Generation (1997-2001, FY33)

The second-generation Q45, known as the FY33, marked a departure from the distinctive styling of its predecessor. It adopted a more conventional luxury sedan appearance. Key changes included:

  • Engine: Retained the 4.5-liter VH45DE V8, but power was slightly reduced in some years to 266 hp.
  • Styling: More traditional styling with a defined grille, catering to a broader market.
  • Features: Continued to offer luxury features like leather seats, premium audio systems, and advanced safety features.
  • Changes: Minor styling tweaks and feature updates occurred throughout the production run.

Third Generation (2002-2006, F50)

The third-generation Q45, known as the F50, aimed to recapture some of the original Q45's innovative spirit while incorporating modern luxury and technology. Key features included:

  • Engine: Updated 4.5-liter VK45DE V8 engine producing 340 hp, offering improved performance.
  • Styling: A more contemporary and elegant design, with a larger presence and sharper lines.
  • Features: Loaded with technology, including navigation systems, rear-view cameras, adaptive cruise control (Intelligent Cruise Control), and a Bose premium audio system.
  • Changes: Minor updates were made in later years, primarily focused on interior trim and feature availability.

Reliability & Common Issues

First Generation (G50)

  • Timing Chain Guides: A well-documented issue. The plastic timing chain guides are prone to failure, leading to potential engine damage. Regular inspection and replacement are crucial. Listen for a rattling noise from the front of the engine.
  • Active Suspension System: The optional Active Suspension System (available on some models) can be problematic and expensive to repair. Many owners opt to replace it with a conventional suspension setup.
  • Oil Leaks: Common from valve covers and rear main seal as the car ages.
  • Electrical Issues: Age-related electrical problems can occur, including issues with sensors and relays.

Second Generation (FY33)

  • Oil Leaks: Similar to the G50, oil leaks from valve covers and other engine seals are common.
  • Catalytic Converters: Can fail due to age and deterioration.
  • Power Seat Motors: The power seat motors can wear out and fail.
  • Electrical Systems: Age related issues are common, such as faulty sensors.

Third Generation (F50)

  • Valve Stem Seals: Some models may experience oil consumption due to worn valve stem seals.
  • Intelligent Cruise Control (ICC) Malfunctions: The ICC system can be prone to malfunctions, often requiring sensor replacement or recalibration.
  • Navigation System Issues: The older navigation systems can become outdated and may experience software glitches.
  • Transmission Issues: Some owners have reported issues with the automatic transmission, particularly with rough shifting.

Driving Experience

First Generation (G50)

The G50 offers a unique driving experience. Its powerful V8 engine provides ample acceleration and a smooth ride. The lack of a traditional grille gives it a distinctive road presence. However, the active suspension (if equipped) can feel somewhat detached from the road.

  • Pros: Powerful engine, unique styling, comfortable ride.
  • Cons: Active suspension complexity, potential timing chain guide issues.

Second Generation (FY33)

The FY33 provides a more conventional luxury sedan driving experience. The ride is comfortable and refined, but the styling is less distinctive than the G50. The engine offers good performance, but it may not feel as exciting as the earlier model.

  • Pros: Comfortable ride, refined handling, more conventional styling.
  • Cons: Less distinctive styling, less engaging driving experience compared to the G50.

Third Generation (F50)

The F50 offers a blend of performance and luxury. The powerful V8 engine delivers impressive acceleration, and the handling is more responsive than previous generations. The abundance of technology features enhances the driving experience, but some systems (like the ICC) can be prone to issues.

  • Pros: Powerful engine, modern technology, improved handling.
  • Cons: Potential valve stem seal issues, ICC malfunctions, complex electronics.

Buying Advice

When considering a used Infiniti Q45, thorough inspection and research are crucial. Here's some buying advice:

  • First Generation (G50): Check for timing chain guide issues and active suspension problems. Look for well-maintained examples with documented service history.
    • Years to look for: 1995-1996 (later models may have addressed some initial issues)
    • Years to avoid: Early models with questionable maintenance history.
  • Second Generation (FY33): Inspect for oil leaks and catalytic converter problems. Ensure all features are working properly.
    • Years to look for: 1999-2001 (later models with minor improvements)
    • Years to avoid: Models with extensive rust or neglected maintenance.
  • Third Generation (F50): Check for valve stem seal issues (excessive oil consumption) and Intelligent Cruise Control functionality. Have a mechanic inspect the transmission for any signs of problems.
    • Years to look for: 2005-2006 (later models with potential improvements)
    • Years to avoid: Models with obvious neglect or lacking service records, especially if the ICC and navigation systems are malfunctioning.

General Tips:

  • Service History: Always prioritize examples with complete and documented service history.
  • Pre-Purchase Inspection: Have a qualified mechanic perform a pre-purchase inspection to identify any potential issues.
  • Test Drive: Thoroughly test drive the vehicle, paying attention to engine performance, transmission smoothness, and the operation of all features.
  • Rust: Check for rust, particularly in areas prone to corrosion, such as the undercarriage and wheel wells.
  • Aftermarket Modifications: Be wary of heavily modified vehicles, as modifications can sometimes compromise reliability.
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