Proper maintenance of your Mitsubishi Eclipse Cross is key to ensuring that the vehicle operates efficiently, reliably, and safely over its lifespan. Among the various maintenance tasks, replacing spark plugs is one of the most critical yet often overlooked procedures. Spark plugs play a vital role in the engine’s ignition system by delivering the electrical spark that ignites the air-fuel mixture inside the combustion chamber. This ignition process powers the engine and keeps your Mitsubishi Eclipse Cross running smoothly.

Over time, spark plugs wear down due to the extreme conditions inside the engine, including high heat and pressure. Worn or fouled spark plugs can lead to several performance issues such as engine misfires, rough idling, difficulty starting, reduced acceleration, decreased fuel economy, and increased emissions. In extreme cases, neglected spark plugs can cause damage to the catalytic converter or other engine components, resulting in costly repairs.

Replacing the spark plugs at the recommended intervals is essential to maintain optimal engine performance, fuel efficiency, and to extend the life of your Mitsubishi Eclipse Cross. This guide will walk you through the tools required and provide a detailed, step-by-step process for replacing the spark plugs yourself, helping you save money while gaining a better understanding of your vehicle’s engine.

Why Spark Plug Maintenance Matters for the Mitsubishi Eclipse Cross

The Mitsubishi Eclipse Cross features an advanced 4-cylinder engine designed to balance power and efficiency. The spark plugs in this engine are engineered to work under precise conditions, and even minor deterioration can affect the overall driving experience. Some specific reasons why maintaining spark plugs in the Eclipse Cross is important include:

  • Engine Efficiency: Efficient combustion ensures that fuel is burned completely, maximizing power output and fuel economy.
  • Emissions Control: Proper ignition timing and spark plug condition help reduce harmful exhaust emissions, contributing to environmental protection and compliance with emission standards.
  • Longevity of Engine Components: Faulty spark plugs can cause unburned fuel to enter the exhaust system, potentially damaging the catalytic converter and other sensitive parts.
  • Smoother Performance: Well-maintained spark plugs contribute to smoother acceleration, stable idling, and reliable engine starts, all of which enhance the driving experience.

The manufacturer’s recommended spark plug replacement interval for the Mitsubishi Eclipse Cross is typically around 60,000 to 100,000 miles, depending on the type of spark plugs used (iridium, platinum, or copper). However, it is wise to inspect them periodically for signs of wear or damage, especially if you notice any symptoms of engine misfire or performance drop.

Essential Tools Needed for Spark Plug Replacement

Before beginning the replacement process, it is important to gather all the necessary tools and materials. Having the right equipment will not only make the job easier but will also reduce the risk of damaging the spark plugs or the engine. Here is a comprehensive list of tools and supplies you will need:

  • Spark Plug Socket Wrench: A deep socket designed specifically for spark plugs, usually sized 5/8 inch or 13/16 inch depending on the plug size.
  • Ratchet Wrench with Extension: To provide the leverage and reach needed to access spark plugs that are recessed deep within the engine bay.
  • Torque Wrench: To tighten spark plugs to the manufacturer’s specified torque, preventing over-tightening or under-tightening which can cause damage or poor performance.
  • Gap Gauge or Feeler Gauge: To measure and adjust the spark plug electrode gap to the precise specification for your Eclipse Cross engine.
  • Anti-Seize Lubricant: Optional but recommended to apply on the threads of new spark plugs to prevent galling and make future removal easier.
  • Compressed Air or Air Blower: To blow away dirt and debris around the spark plug area before removal, preventing contaminants from entering the combustion chamber.
  • Protective Gloves: To protect your hands from dirt, heat, and sharp engine components.
  • Safety Glasses: To protect your eyes from dust or debris when cleaning around the spark plug holes.

Having these tools on hand will prepare you for a smooth and safe spark plug replacement process.

Choosing the Right Spark Plugs for Your Mitsubishi Eclipse Cross

When replacing spark plugs, it is important to select the correct type recommended by Mitsubishi for the Eclipse Cross. Using the right spark plug ensures compatibility with the engine’s combustion characteristics and ignition system. Common spark plug types include:

  • Iridium Spark Plugs: These are premium plugs known for their durability and longevity, often lasting up to 100,000 miles. They provide excellent ignitability and efficient combustion.
  • Platinum Spark Plugs: These plugs offer good performance and durability, typically lasting around 60,000 miles.
  • Copper Spark Plugs: More affordable but with a shorter lifespan, usually around 20,000 to 30,000 miles. Not commonly recommended for modern Mitsubishi engines due to faster wear.

Refer to the owner’s manual or consult with a Mitsubishi dealership to verify the exact spark plug model, gap, and specification recommended for your Eclipse Cross’s engine variant and model year. Using OEM (Original Equipment Manufacturer) or high-quality aftermarket spark plugs is advised to maintain engine performance and warranty compliance.

Detailed Step-by-Step Spark Plug Replacement Technique

Replacing spark plugs on the Mitsubishi Eclipse Cross can be done by an experienced DIY enthusiast or professional mechanic. The process requires attention to detail to avoid damage to the spark plugs or engine components. Follow these steps carefully:

Step 1: Prepare the Vehicle and Workspace

  • Park your Mitsubishi Eclipse Cross on a flat, stable surface and engage the parking brake.
  • Allow the engine to cool completely to avoid burns or damage, as spark plugs and engine components can become extremely hot after running.
  • Disconnect the negative terminal of the battery to prevent accidental electrical shorts while working near the ignition system.
  • Gather all necessary tools and replacement spark plugs within easy reach.

Step 2: Open the Hood and Locate the Spark Plugs

Open the hood and secure it with the prop rod or hood struts. The Mitsubishi Eclipse Cross’s spark plugs are typically located on the top or side of the engine block beneath the ignition coils. Depending on the engine layout, you may need to remove engine covers or components to gain clear access.

Step 3: Clean the Spark Plug Area

Before removing any spark plugs, use compressed air or a blower to carefully clean the area around each spark plug. This step is critical to prevent dirt, dust, or debris from falling into the combustion chamber when the spark plugs are removed, which could cause engine damage.

Step 4: Remove the Ignition Coils or Spark Plug Wires

  • Identify the ignition coils or spark plug wires attached to each spark plug.
  • If your Eclipse Cross has coil-on-plug ignition, carefully disconnect the electrical connector from the coil by pressing the release tab.
  • Remove any bolts securing the ignition coil and gently pull the coil straight out to avoid damaging it.
  • If your vehicle uses spark plug wires, grasp the boot (not the wire) and carefully twist and pull to remove it from the spark plug.

Step 5: Remove the Old Spark Plugs

  • Attach the spark plug socket to the ratchet wrench with an extension for reach.
  • Insert the socket over the spark plug, ensuring a firm grip.
  • Turn the wrench counterclockwise to loosen and carefully remove the spark plug.
  • Be gentle when removing the plug to avoid damaging the threads in the cylinder head.

Step 6: Inspect and Prepare the New Spark Plugs

  • Compare the new spark plugs with the old ones to verify the correct type and size.
  • Use a gap gauge or feeler gauge to measure the electrode gap on each new spark plug.
  • Adjust the gap carefully to match the Mitsubishi specification provided in your owner’s manual (typically between 0.028 and 0.032 inches but confirm for your model).
  • Apply a small amount of anti-seize lubricant to the threads of each new spark plug if desired, which helps prevent seizing and facilitates easier removal in the future. Be careful not to get lubricant on the electrode or insulator.

Step 7: Install the New Spark Plugs

  • Insert the new spark plug into the spark plug socket and carefully thread it into the cylinder head by hand. Hand threading helps prevent cross-threading, which can damage the cylinder head.
  • Once hand-tight, use a torque wrench to tighten the spark plug to the manufacturer’s specified torque setting. Over-tightening can strip threads or crack the spark plug, while under-tightening can cause poor sealing and performance issues. For the Mitsubishi Eclipse Cross, typical torque values range between 13 to 22 ft-lbs (18 to 30 Nm), but always check your specific model’s manual.

Step 8: Reattach the Ignition Coils or Spark Plug Wires

  • Place the ignition coil back onto the spark plug, ensuring it seats fully.
  • Secure the coil with any mounting bolts you removed earlier.
  • Reconnect the electrical connector to the coil, ensuring it clicks into place.
  • If using spark plug wires, firmly push the boot onto the spark plug until it clicks or feels secure.

Step 9: Repeat for Each Spark Plug

Repeat steps 3 through 8 for each spark plug in your Mitsubishi Eclipse Cross engine, working methodically to avoid confusion. It is best to replace plugs one at a time to prevent mixing up ignition components.

Step 10: Final Checks and Test Drive

  • After all spark plugs have been replaced and ignition coils or wires reattached, reconnect the negative battery terminal if disconnected.
  • Double-check that all tools are removed from the engine bay and that all components are securely fastened.
  • Start the engine and listen for any signs of rough idling, misfires, or unusual noises.
  • Take the vehicle for a short test drive to ensure smooth acceleration and normal operation.
  • If any warning lights appear on the dashboard or if performance issues persist, re-inspect your work or consult a professional technician.

Additional Tips for Spark Plug Replacement on the Mitsubishi Eclipse Cross

  • Work in a Clean Environment: Dirt and debris can damage engine components. Always keep the work area clean and cover the engine intake ports when spark plugs are removed.
  • Use OEM or High-Quality Parts: Using genuine Mitsubishi spark plugs or trusted aftermarket brands ensures compatibility and reliability.
  • Follow the Owner’s Manual: Always adhere to the specific maintenance schedule, torque settings, and gap specifications outlined in your Mitsubishi Eclipse Cross owner’s manual.
  • Inspect Ignition Components: While replacing spark plugs, check ignition coils, wires, and connectors for wear or damage and replace if necessary.
  • Keep Spark Plugs Dry and Clean: Store new spark plugs in their packaging until installation to avoid contamination or damage.

When to Seek Professional Assistance

While spark plug replacement is a manageable DIY task for many car enthusiasts, certain situations warrant professional intervention. Consider consulting a certified Mitsubishi technician if you encounter:

  • Difficulty accessing spark plugs due to engine layout or additional components.
  • Damaged or seized spark plugs that cannot be removed easily.
  • Engine performance issues that persist after spark plug replacement.
  • Unfamiliarity with torque specifications or lacking appropriate tools.
  • Warranty considerations requiring service by authorized Mitsubishi centers.

Professional technicians have specialized tools and experience to handle complex engine maintenance safely and efficiently.

Conclusion

Regularly replacing the spark plugs on your Mitsubishi Eclipse Cross is a vital maintenance task that helps preserve engine performance, fuel economy, and emission control. By understanding the function of spark plugs and following the proper replacement procedures outlined above, you can confidently perform this service yourself or know what to expect when visiting a mechanic.

Investing the time and effort to maintain your spark plugs ensures your Mitsubishi Eclipse Cross continues to deliver the reliable, responsive driving experience you expect. Always consult your owner’s manual for model-specific details, use quality parts, and adhere to recommended maintenance intervals to keep your vehicle running at its best.