Reliability Breakdown: Common Weak Points in Wrx and Evo and How to Fix Them

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The Subaru WRX and Mitsubishi Lancer Evolution (Evo) are two of the most iconic performance cars in the automotive world. Both have garnered a loyal following due to their rally heritage and thrilling driving experiences. However, like any performance vehicle, they come with their own set of reliability issues. In this article, we will explore common weak points in both the WRX and Evo, and provide practical solutions to address these issues.

Common Weak Points in the Subaru WRX

  • Head Gasket Failure: A recurring issue in older WRX models, often caused by overheating or improper maintenance.
  • Turbocharger Problems: Turbo failure can occur due to oil starvation or excessive boost pressure.
  • Transmission Issues: Manual transmissions can suffer from clutch wear and grinding, while automatics may face shifting problems.
  • Suspension Wear: Components can wear out quickly due to aggressive driving and rough road conditions.

Head Gasket Failure

Head gasket failure is a common issue, especially in models from the early 2000s. Symptoms include coolant loss, overheating, and white smoke from the exhaust. To mitigate this, regular maintenance is crucial. Consider the following:

  • Regularly check coolant levels and look for signs of leaks.
  • Use a quality coolant and change it according to the manufacturer’s schedule.
  • Upgrade to a stronger aftermarket head gasket if you plan on increasing power.

Turbocharger Problems

Turbochargers in the WRX can fail due to lack of lubrication or excessive boost. To prevent turbo issues, follow these tips:

  • Always allow the engine to warm up before driving aggressively.
  • Change the oil regularly and use high-quality synthetic oil.
  • Consider installing an aftermarket oil cooler to maintain optimal temperatures.

Transmission Issues

Transmission problems can arise in both manual and automatic WRX models. To ensure longevity:

  • Regularly check and change transmission fluid.
  • Upgrade the clutch if you frequently drive aggressively.
  • Consider a transmission cooler for better heat management.

Suspension Wear

Suspension components on the WRX can wear out due to performance driving. To maintain a reliable suspension:

  • Inspect and replace worn bushings and struts regularly.
  • Consider upgrading to performance suspension components for better durability.
  • Align the wheels after any suspension work to prevent uneven wear.

Common Weak Points in the Mitsubishi Lancer Evolution

  • Engine Knock: Can be caused by improper tuning or low-quality fuel.
  • Transfer Case Issues: Common in older models, leading to drivetrain failures.
  • Fuel Pump Problems: Can lead to fuel starvation, especially in modified vehicles.
  • Electrical Gremlins: Can affect various systems, from the ECU to sensors.

Engine Knock

Engine knock is a serious concern for Evo owners. It can lead to severe engine damage if not addressed. To prevent knock:

  • Use high-octane fuel to minimize the risk of knocking.
  • Ensure your engine is properly tuned for the fuel you are using.
  • Install a knock sensor if your model doesn’t have one to monitor engine health.

Transfer Case Issues

Transfer case problems can lead to significant drivetrain issues. To avoid these problems:

  • Regularly inspect and change transfer case fluid.
  • Be cautious with aggressive driving, especially in tight turns.
  • Consider a reinforced transfer case if you plan on racing or heavy use.

Fuel Pump Problems

Fuel pump failures can lead to performance issues and engine stalling. To ensure reliability:

  • Upgrade to a high-performance fuel pump if you have modified your engine.
  • Regularly check fuel filter and replace as needed.
  • Monitor fuel pressure to ensure the pump is functioning correctly.

Electrical Gremlins

Electrical issues can plague the Evo, often leading to frustrating troubleshooting. To minimize these problems:

  • Inspect wiring and connectors regularly for corrosion or damage.
  • Use quality aftermarket parts when replacing electrical components.
  • Consider a professional diagnosis if electrical issues persist.

Conclusion

Both the Subaru WRX and Mitsubishi Lancer Evolution are remarkable vehicles that offer exhilarating performance. However, they do have common reliability issues that can be addressed with proper maintenance and upgrades. By being proactive and aware of these weak points, owners can enjoy their cars for many years to come.