Mitsubishi Diamante: A Comprehensive Buyer's Guide
The Mitsubishi Diamante, also known as the Sigma in some markets, was a mid-size/executive car produced by Mitsubishi Motors from 1990 to 2005. Bridging the gap between the Galant and the luxury-oriented Debonair, the Diamante aimed to offer a blend of comfort, performance, and value. It competed with cars like the Toyota Avalon, Nissan Maxima, and Honda Accord (in its higher trims). The Diamante was known for its refined ride, spacious interior, and potent V6 engine options, making it a compelling choice for those seeking a comfortable and well-equipped sedan.
Generations
First Generation (1990-1996)
The first-generation Diamante debuted in 1990 and represented a significant step up in refinement and sophistication for Mitsubishi. It was available as both a sedan and a wagon. Key features of this generation include:
- Styling: Rounded, aerodynamic design, reflecting the contemporary aesthetic of the early 1990s.
- Engines: Primarily powered by 3.0L and 3.5L V6 engines, offering a good balance of power and fuel efficiency. The 3.0L was more common, and a 2.5L was offered in some markets.
- Features: Available with features like automatic climate control, power windows and locks, cruise control, and optional leather upholstery. Some higher trims also included advanced safety features for the time, such as ABS and traction control.
- Significant Changes: A minor facelift occurred around 1993-1994, refining the front fascia and interior details.
Second Generation (1996-2005)
The second-generation Diamante, introduced in 1996, featured a more modern and angular design. It continued to prioritize comfort and refinement but with updated technology and styling.
- Styling: Sharper lines and a more assertive front grille. Overall, a more contemporary look than the first generation.
- Engines: Primarily a 3.5L V6 engine, further refined for improved performance and efficiency. The 3.0L was discontinued for the North American market.
- Features: Available with more advanced features such as a premium audio system, automatic climate control, power adjustable seats with memory function, and optional navigation systems (later models). Stability control became an option in later years.
- Significant Changes: The second generation saw minor revisions throughout its production run, mainly focused on interior trim and feature updates. The exterior design remained largely consistent. The wagon body style was discontinued.
Reliability & Common Issues
The Mitsubishi Diamante, while generally reliable, has some known issues that potential buyers should be aware of:
- Engine Issues (3.5L):
- Valve Stem Seals: Older 3.5L engines are prone to valve stem seal wear, leading to oil consumption and blue smoke upon startup. This is a common issue that requires attention.
- Timing Belt: Like many engines with interference designs, the timing belt is crucial. Failure can lead to catastrophic engine damage. Adhere strictly to the recommended replacement interval (typically 60,000 miles). When replacing the timing belt, it's wise to replace the water pump and tensioner as well.
- EGR System: EGR valve and ports can become clogged, causing rough idling and potentially triggering the check engine light. Cleaning or replacement may be necessary.
- Transmission Issues:
- Automatic Transmission Slippage: Older models, especially those with neglected maintenance, can experience transmission slippage or harsh shifting. Regular fluid changes are critical.
- Torque Converter: Torque converter failure is a possibility on higher-mileage examples.
- Electrical Issues:
- Sensor Failures: MAF sensors, O2 sensors, and crankshaft position sensors can fail, leading to driveability problems and check engine lights.
- Wiring Harness Problems: Age and heat can cause wiring harnesses to become brittle and crack, leading to intermittent electrical issues.
- Suspension Issues:
- Strut Mounts and Bushings: Wear and tear on strut mounts and bushings can result in a noisy and uncomfortable ride.
- Rear Suspension Sag (Wagon - First Gen): The rear suspension on the wagon could sag over time due to the added weight.
- Other Common Issues:
- Rust: Depending on the geographical location, rust can be a significant issue, particularly in areas where salt is used on roads. Pay close attention to the undercarriage, rocker panels, and wheel wells.
- Interior Trim: Plastic trim pieces can become brittle and break over time.
- HVAC Issues: The automatic climate control system can develop problems, such as failing actuators or a faulty blend door.
General Maintenance: Regular maintenance, including oil changes, fluid flushes, and tune-ups, is crucial for the longevity and reliability of the Diamante. Using quality parts and adhering to the manufacturer's recommended service intervals is highly recommended.
Driving Experience
The Mitsubishi Diamante is generally regarded as a comfortable and refined sedan, offering a smooth and quiet ride. Here's a breakdown of the driving experience:
- Pros:
- Comfortable Ride: The Diamante excels in providing a comfortable and compliant ride, absorbing bumps and road imperfections with ease.
- Spacious Interior: Both generations offer a spacious interior with ample legroom and headroom for both front and rear passengers.
- Powerful V6 Engine: The V6 engines provide ample power for confident acceleration and highway cruising.
- Refined Handling: The Diamante offers balanced handling, making it enjoyable to drive on winding roads.
- Well-Equipped: Even base models come well-equipped with features, and higher trims offer a luxurious driving experience.
- Cons:
- Fuel Economy: Fuel economy is average for its class, but it's not particularly outstanding, especially with the 3.5L engine.
- Handling (Sporty): While refined, the Diamante isn't designed for sporty handling. Those seeking a more engaging driving experience might find it lacking.
- Parts Availability: Parts availability can be a challenge, especially for older models. Some parts may be difficult to find or require special ordering.
- Styling (Subjective): The styling of both generations may not appeal to everyone.
Buying Advice
If you're considering purchasing a Mitsubishi Diamante, here's some advice to help you make an informed decision:
- Years to Consider:
- Second Generation (1996-2005): Generally considered to be more modern and refined than the first generation. Later years of the second generation (2000+) may offer improved reliability and more features.
- Years to Potentially Avoid:
- Early First Generation (1990-1992): Older and potentially more prone to wear and tear. Finding parts can also be challenging.
- What to Look For:
- Maintenance Records: Look for a well-maintained example with complete service records. Pay close attention to timing belt replacement history.
- Engine Condition: Check for signs of oil consumption, such as blue smoke from the exhaust. Listen for any unusual engine noises.
- Transmission Condition: Test drive the car thoroughly to check for smooth and consistent shifting. Be wary of any slippage or harsh shifts.
- Rust: Thoroughly inspect the car for rust, especially in areas prone to corrosion.
- Electrical Functionality: Check that all electrical components, such as lights, windows, locks, and climate control, are working properly.
- Pre-Purchase Inspection: Have a qualified mechanic perform a pre-purchase inspection to identify any potential problems before you buy.
- Pricing:
- The Mitsubishi Diamante is generally affordable due to its age and depreciation. Pricing will vary depending on the year, condition, mileage, and location. Research comparable models in your area to get a fair price.
- Alternatives:
- If you can't find a Diamante that meets your needs, consider alternatives like the Toyota Avalon, Nissan Maxima, or Honda Accord. These vehicles offer similar levels of comfort, reliability, and features.
By carefully considering these factors, you can increase your chances of finding a well-maintained and reliable Mitsubishi Diamante that will provide years of comfortable and enjoyable driving.
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