A Guide to Spark Plug Wire Sets for the 1990-1995 Mitsubishi Eclipse
Choosing the right spark plug wires is crucial for keeping your 1G DSM running smoothly.
- For most 1990-1995 Eclipse owners, NGK or Denso wire sets are the best choice for reliability and proper fit.
- Replacement is an easy DIY job; just replace one wire at a time to avoid mixing up the firing order.
- Symptoms of failure include a rough idle, engine hesitation, misfires, and a decrease in fuel economy.
- Always inspect and consider replacing spark plugs (NGK BPR6ES/7ES are preferred) at the same time as the wires.
Signs of a Failing Spark Plug Wire Set
When spark plug wires start to fail on your Eclipse, the symptoms are usually noticeable. Because the wires can no longer deliver a consistent, strong spark, the engine's combustion process is affected. You might experience one or more of the following issues:
- Rough Idle: The engine may shake or vibrate more than usual when the car is stopped.
- Engine Hesitation: When you press the gas pedal, the car might stumble or hesitate before accelerating smoothly.
- Misfires: You may feel a jerking or stumbling from the engine, especially under load. A check engine light may also come on.
- Reduced Fuel Economy: Inefficient combustion means the engine uses more fuel to produce the same amount of power.
- Visible Damage: You might see cracks, burn marks, or melting on the wire insulation or boots. In the dark with the engine running, you may even see small sparks arcing from the wires to a metal part of the engine.
Choosing the Right Aftermarket Wires for Your Eclipse
For a vehicle like the 1G Eclipse, aftermarket spark plug wires are the standard. High-quality aftermarket brands often meet or exceed the original factory specifications. The brands available can be grouped into different tiers based on quality and intended use, according to owner experiences.
Tier 1: OEM-Quality Replacements
These brands are the top recommendation for the vast majority of Eclipse owners, from daily drivers to moderately modified cars. They are known for excellent fit, quality, and reliability.
- NGK: This is the most frequently recommended brand by 1G DSM owners. NGK wires are considered the gold standard for a reason—they are often the original equipment manufacturer and provide reliable performance.
- Denso: Another top-tier Japanese brand, Denso is widely regarded as being on par with NGK for quality and performance. You can't go wrong choosing either NGK or Denso.
Tier 2: Performance-Focused Wires
If you have a highly modified Eclipse or are looking for a specific aesthetic, these brands offer thicker wires with lower resistance. While they can work well, some owners report that they can be too long, leading to a cluttered look in the engine bay.
- Taylor Cable: A popular performance choice, known for good quality and thicker wires (e.g., 8mm or 10.4mm). They are a solid option, but be prepared for potential length differences compared to stock.
- Granatelli / MSD: These brands are also known in the performance world and can be a good choice, especially if you are using other parts from their ignition systems.
Tier 3: Standard & Economy Replacements
These brands offer a functional, budget-friendly solution for a stock daily-driven car.
- Standard Wires (SMP): A common aftermarket brand that provides acceptable quality for standard replacement needs.
- Walker Products / Prenco: These fall into the economy category, offering a low-cost alternative to get your car back on the road.
A Note on Fitment
Some owners have reported issues with certain brands, like Bosch, having wires that are too long for the Eclipse engine bay, creating a messy installation. When in doubt, sticking with an OEM-style brand like NGK or Denso is the safest bet for a perfect fit.
Typical Costs for a New Spark Plug Wire Set
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Economy) | $21 - $45 |
| New Aftermarket (OEM-Quality/Performance) | $45 - $94 |
| Shop Labor | $50 - $100 |
Pro Tip: Installation
Replacing spark plug wires is a great DIY job that takes less than an hour. The most important rule is to replace one wire at a time. This prevents mixing up the firing order, which would cause the engine to run poorly or not at all. Make sure you feel or hear a "click" when you push the new wire's boot onto the spark plug and distributor cap.
Frequently Asked Questions
Do I need expensive performance wires for my stock Eclipse?
No. For a stock or lightly modified car, a quality set of NGK or Denso wires is more than sufficient and is the most recommended option. Performance wires won't add horsepower on their own; their job is to prevent spark loss on very high-output engines.
Why did my spark plug wire pop off the spark plug?
This can happen if the spark plug itself is not tightened correctly or its washer isn't sealing properly. Combustion pressure can leak past the plug threads and push the wire boot off. Ensure your spark plugs are torqued to spec.
What's the difference between 8mm and 10mm wires?
The measurement refers to the diameter of the wire. Thicker wires have more insulation, which can help prevent voltage from arcing to ground, especially on high-output ignition systems. For most applications, the standard 7mm or 8mm wire is perfectly fine.
Should I replace my spark plugs at the same time?
Yes, it is highly recommended. The spark plug wires and spark plugs work together and have similar service lives. Replacing them at the same time is a core part of a vehicle tune-up. DSM owners overwhelmingly recommend NGK BPR6ES or BPR7ES plugs for the 4G63 engine.
Technical Specifications
OEM Part Numbers: SMW250506 MD334043
The 1990-1995 Mitsubishi Eclipse uses a distributor-style ignition system with four spark plug wires and one coil wire.
We Have This Part in Stock
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
- Signs of a Failing Spark Plug Wire Set
- Choosing the Right Aftermarket Wires for Your Eclipse
- Tier 1: OEM-Quality Replacements
- Tier 2: Performance-Focused Wires
- Tier 3: Standard & Economy Replacements
- A Note on Fitment
- Typical Costs for a New Spark Plug Wire Set
- Pro Tip: Installation
- Frequently Asked Questions
- 🎟️ Get 5% Off