Mitsubishi Lancer Evo X Engine Reliability

Is the Mitsubishi Lancer Evo X Engine Reliable? A Deep Dive for Enthusiasts

The Mitsubishi Lancer Evolution X, a legend in the rally-inspired performance car scene, graced our roads from 2007 to 2016. Replacing the venerable 4G63T, the Evo X introduced the all-new 4B11T turbo engine, boasting at least 276 horsepower. This powerplant was not only a step forward in technology but also proved capable of handling close to 400 horsepower on its stock bottom end, often considered an improvement over its predecessor in a stock-to-stock comparison. However, for any enthusiast considering purchasing or maintaining an Evo X, the crucial question remains: just how reliable is this potent engine and the vehicle it powers?

This article aims to provide a comprehensive overview of the common issues encountered by Evo X owners, offering insights and potential solutions to help you make an informed decision or navigate the complexities of ownership. Let's delve into the specifics.

Common Issues and Solutions for the Evo X

While the Evo X is a formidable machine, like any high-performance vehicle, it can present specific challenges. Understanding these potential pitfalls is key to ensuring its longevity and your enjoyment.

Plastic Clutch Master Cylinder (5-Speed Transmissions)

A notable concern, particularly in models equipped with the 5-speed transmission, is the clutch master cylinder. Constructed predominantly from plastic, this component connects to the rear firewall and is susceptible to complete failure. Should this occur, you'll find yourself unable to engage the clutch, rendering the vehicle undrivable. The recommended solution is a straightforward upgrade to a more robust aftermarket master cylinder, which should resolve the issue effectively.

Knocking Noise from Front Suspension

Many owners report hearing knocking noises from the front suspension, especially during cornering. Often, this is a relatively minor issue that can be rectified by simply lubricating the front suspension struts. However, if the noise persists or an unusual sound is detected, it could indicate a more significant problem with the Bilstein dampers. These dampers can fail over time, and if they've reached their operational limit, replacement or rebuilding will be necessary.

Fuel Pump Relay Issues

The fuel pump relay is another component that can degrade over time. This problem was more prevalent in earlier models of the Evo X. Fortunately, an upgraded blue relay is available (Part Number: 8627A024) that effectively addresses this fault. Ensuring your vehicle has this updated relay can prevent potential fuel delivery issues.

Pre-2011 Model Specific Concerns

The earlier iterations of the Evo X, specifically those manufactured before 2011, are known to have a couple of more significant issues that might give prospective buyers pause.

• Differential Pin Failure: A critical concern in pre-2011 models is the differential pin. These pins have a tendency to snap and fail, leading to catastrophic differential damage. Symptoms can range from increased noise emanating from the differential to a noticeable leak of differential fluid. This failure can occur rapidly and is a considerable risk.
• Timing Chain Stretch: Another issue affecting pre-2011 cars, often occurring under 50,000 miles, is timing chain stretch. This can trigger a P0012 engine code, cause the idle to flutter, and result in a noticeable decrease in both power and fuel efficiency. The only permanent fix is to replace the timing chain with an upgraded, more durable unit. While timing chains are designed to last the lifetime of a vehicle, this hasn't always been the case with the early Evo X models.

Input Shaft Bearing Whine

A distinct whining noise that intensifies with vehicle speed and is loudest around 40 mph often points to a failing input shaft bearing within the gearbox. This requires a gearbox overhaul to replace the bearing, which is a labour-intensive and costly repair. The noise typically subsides when accelerating or when the clutch is depressed, though some owners report residual noise even under acceleration. Addressing this input shaft bearing issue promptly is advisable to prevent further gearbox damage.

AYC Pump Failure

Perhaps the most commonly reported failure on the Evo X is the AYC (Active Yaw Control) pump. The factory location of this pump, situated under the rear wheel, makes it highly susceptible to contamination from road debris, water, and dirt. This ingress can lead to corrosion and premature failure, often manifesting as an internal oil leak or motor failure. While used pumps can be found for around £500-£700, relocating the pump to a more protected position is a highly recommended preventative measure. This relocation can save significant costs and hassle in the long run.

Climate Control Odour

A peculiar and unpleasant fishy smell emanating from the climate control system typically indicates a blocked evaporator drain hole. Clearing this obstruction should resolve the odour issue. Regular checks and maintenance of this drain can prevent this annoyance.

Early Model Airflow Sensor (MAF) Failures

In earlier models (pre-2011), the Mass Airflow (MAF) sensors were prone to premature failure. Symptoms can include engine codes such as P0102 and erratic throttle response. Before replacing the sensor, it's worth attempting to clean it, as this can sometimes rectify the problem. However, expect that a replacement might be necessary.

Cracked Exhaust Manifold

A recurring issue reported by owners is the cracking of the exhaust manifold, particularly within the first few years of ownership. While many of these should have been addressed under warranty, the extreme heat cycles the manifold endures can still lead to cracks developing. Options for repair include welding the existing manifold or, more permanently, upgrading to a tubular exhaust manifold. Welding is often a temporary fix, and a quality aftermarket upgrade is generally the preferred solution for long-term reliability.

Additional Considerations

Beyond the mechanical components, a few other aspects are worth noting:

• ECU Tuning: The 2008 models were noted for having a very rich ECU tune. Revisions made from 2011 onwards improved this aspect.
• Recaro Seats: These desirable seats were primarily found in GSR versions of the pre-2015 models.
• Paint Quality: The clear coat on some Evo X models can be susceptible to peeling when exposed to prolonged direct sunlight. Regular waxing and protection of the paintwork are recommended to mitigate this issue, suggesting that Mitsubishi may have cut some corners in this area.

Comparative Reliability: Early vs. Later Models

To summarise the reliability improvements:

Frequently Asked Questions (FAQs)

Q1: Is the 4B11T engine in the Evo X generally reliable?

Yes, the 4B11T engine itself is considered robust and capable, especially when compared to its predecessor. However, the overall reliability of the Evo X is impacted by other systems and components, particularly in earlier models.

Q2: What is the most common failure on an Evo X?

The AYC pump failure is widely regarded as the most common and potentially costly issue encountered by Evo X owners.

Q3: Should I avoid pre-2011 Evo X models?

While not all pre-2011 models will have these issues, the higher incidence of differential pin and timing chain problems makes them a riskier proposition. It is generally advisable to lean towards 2011 and later models for improved reliability.

Q4: How can I prevent AYC pump failure?

The most effective preventative measure is to relocate the AYC pump from its vulnerable factory position under the rear wheel to a higher, more protected location. This significantly reduces exposure to water and debris.

Q5: Can the Evo X handle significant power upgrades?

The stock bottom end of the 4B11T engine can typically handle around 400 horsepower. For power outputs exceeding this, internal engine upgrades will be necessary to ensure reliability.

Conclusion: A Rewarding, Yet Demanding, Ownership Experience

The Mitsubishi Lancer Evolution X remains an exceptional and track-capable vehicle that offers an exhilarating driving experience. However, this performance comes at the cost of potential maintenance and repair expenses. The earlier models, particularly those predating 2011, present a higher likelihood of costly issues such as differential pin and timing chain failures. It is strongly recommended to steer clear of these years if possible, or at least be prepared for extensive pre-purchase inspections and potential corrective measures.

From mid-2011 onwards, Mitsubishi addressed many of these teething problems, making the 2012 and later models a more sensible choice for the average buyer seeking greater reliability. Even with these improvements, components like the AYC pump can still fail. Being proactive, such as relocating the AYC pump before it becomes a problem, can save considerable expense and hassle. With diligent maintenance and an awareness of its potential weaknesses, the Evo X can be a rewarding car to own, offering unparalleled driving dynamics for its era.

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