Choosing the Right Spark Plug Wire Set for Your 1996-2005 Mitsubishi Eclipse
Keep your Eclipse's engine running smoothly by fixing misfires and rough idling with the correct set of new spark plug wires.
- This part is for 1996-2005 Eclipse models only; 2006+ models use a different coil-on-plug system.
- NGK and Denso are highly recommended aftermarket brands that provide OEM-level fit and quality.
- Always replace spark plug wires as a complete set, not individually, to ensure consistent performance.
- Before installing new wires, check for oil leaks from the valve cover gasket, a common issue that can ruin the new parts.
Is Your Eclipse Running Rough? It Could Be the Spark Plug Wires
If your Mitsubishi Eclipse is experiencing symptoms like a shaky idle, hesitation when you accelerate, or a general lack of power, it might be time to inspect your spark plug wires. These wires don't last forever. Exposure to high engine heat and oil can cause them to crack, melt, or degrade internally, leading to a weak or lost spark. This is a common maintenance item, and replacing them can make a big difference in how your car drives.
Important Note on Vehicle Years
This guide applies specifically to 1996-2005 Mitsubishi Eclipse models (2G and 3G generations). The 2006 and newer Eclipse (4G) uses a coil-on-plug ignition system which does not have traditional spark plug wires. If you have a 2006 or later model, you will need ignition coil boots, not a full wire set.
Choosing the Right Aftermarket Spark Plug Wires
When shopping for new spark plug wires, you'll find several brands. They generally fall into three quality tiers. For a daily driven Eclipse, sticking to OEM-equivalent brands is a safe and reliable choice.
Tier 1: OEM-Equivalent Brands
These brands are often the original suppliers to Mitsubishi and are known for their perfect fit and reliable performance. They are engineered to meet or exceed the original specifications.
- NGK: Widely considered the gold standard by many Eclipse owners and mechanics. NGK wires are known for their durability, excellent electrical suppression to prevent radio noise, and precise fit for all Eclipse engines from this period.
- Denso: Another top-tier Japanese brand that is a major OEM supplier. Denso wires feature identical OE end caps that click into place for a secure connection, ensuring reliability.
Tier 2: Performance & Value Brands
These brands offer a balance of performance features and cost. They may advertise lower resistance or come in different colors for a custom look under the hood.
- Accel & Taylor Cable: Often marketed as performance wires, they may offer thicker insulation and lower resistance. Some owners choose these for modified cars.
- Granatelli: Known for very low resistance wires, which they claim delivers a stronger spark. This is typically more than what a stock or lightly modified Eclipse needs but is an option for performance builds.
Tier 3: Standard Replacement Brands
These are budget-friendly options that get the job done for a daily driver. They meet basic requirements but may not have the same longevity or perfect fit as premium brands.
- Standard (SMP) & Walker Products: These brands provide functional, cost-effective replacements that meet OE standards for fit and function.
Pro Tip: Check for Oil Leaks
When replacing your spark plug wires, inspect the spark plug tubes for oil. A common issue on the Eclipse, especially the V6 model, is a leaking valve cover gasket. Oil will quickly destroy a new set of spark plug wires, so it's critical to replace the valve cover and spark plug tube seals if you see any oil contamination.
Cost of Replacing Spark Plug Wires on a 1996-2005 Eclipse
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Wire Set | $30 - $94 |
| New OEM (Mitsubishi) Wire Set | $75 - $200 |
| Shop Labor | $60 - $150 |
Frequently Asked Questions
How do I know if my spark plug wires are bad?
Common symptoms include a rough or vibrating idle, engine hesitation or stumbling during acceleration, a noticeable loss of power, decreased fuel economy, and a check engine light with misfire codes (P0300, P0301, P0302, etc.). You can also perform a visual inspection for cracks, burns, or melting on the wire insulation.
Can I replace just one bad wire?
It is strongly recommended to replace the spark plug wires as a complete set. Wires degrade at a similar rate due to heat and age. If one has failed, the others are likely not far behind.
How often should I replace my spark plug wires?
There is no universal interval, but a good practice is to inspect them during every spark plug change (typically every 30,000 to 60,000 miles). Many owners replace them as a set along with the spark plugs to ensure the ignition system is in top condition.
Is it difficult to replace the wires myself?
For 4-cylinder Eclipse models (420A, 4G63, 4G64), the job is very easy and can be done with basic tools in under an hour. For the 3.0L V6 (6G72), the three front wires are easy, but the three rear wires are difficult to access and require removing the intake plenum, making the job much more involved.
Technical Specifications
OEM Part Numbers: MD361060 MD338624 SMW250506 MD343245
Fitment varies by engine (2.0L 420A, 2.0L Turbo 4G63, 2.4L 4G64, 3.0L V6 6G72). Wires are made of silicone or EPDM rubber to resist heat and oil. Wire diameter typically ranges from 7mm to 8mm for stock replacements. Performance wires may be thicker (e.g., 10.2mm). Core is typically a spiral-wound magnetic type to suppress radio frequency interference (RFI).
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Mitsubishi Eclipse:
- 🛍️ Shop This Part
- Is Your Eclipse Running Rough? It Could Be the Spark Plug Wires
- Important Note on Vehicle Years
- Choosing the Right Aftermarket Spark Plug Wires
- Tier 1: OEM-Equivalent Brands
- Tier 2: Performance & Value Brands
- Tier 3: Standard Replacement Brands
- Pro Tip: Check for Oil Leaks
- Cost of Replacing Spark Plug Wires on a 1996-2005 Eclipse
- Frequently Asked Questions
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