Ignition Coil Guide for the 2006-2012 Mitsubishi Eclipse
Fix engine misfires and restore performance by choosing the right ignition coils for your 4G Eclipse.
- Both the 2.4L and 3.8L V6 engines use the same coil-on-plug ignition coils (part number MR994643).
- Symptoms of failure include a check engine light (P0300-P0306), rough idle, and loss of power.
- On V6 models, replacing the three rear coils is much more difficult and costly as it requires removing the intake manifold.
- Check for oil leaks from the valve cover gasket, as this is a common cause of premature coil failure.
Is Your Eclipse's Ignition Coil Failing?
A bad ignition coil can make your Eclipse run poorly. Symptoms often start small but can get worse, leading to more serious engine problems. If you notice your car shaking at idle, hesitating when you accelerate, or the check engine light is on, a failing coil could be the culprit. Driving with a bad coil for too long can damage your catalytic converter, which is an expensive repair.
Check for Oil Leaks
A common issue that causes ignition coils to fail is a leaking valve cover gasket. Oil can seep into the spark plug tubes and damage the coil boots and the coils themselves. If you see wet oil on the old coil when you remove it, you should replace the valve cover gasket at the same time to prevent the new coils from failing prematurely.
🎬 See this step-by-step guide to replacing your valve cover gasketChoosing the Right Aftermarket Ignition Coil
When replacing ignition coils, you don't have to buy expensive OEM parts. Many aftermarket brands offer excellent quality, often for a much lower price. Here’s a breakdown of brands to help you choose:
- Premium Brands (OEM Quality or Better): Brands like NGK, Delphi, and Denso are often original equipment suppliers for many car manufacturers and have a strong reputation for reliability. Forum users and mechanics frequently recommend these brands for their quality and durability.
- Trusted Aftermarket Brands: Standard Motor Products (SMP) is a well-regarded brand that has been around for a long time. They offer good quality parts, though some users note that quality can vary depending on the specific product line. Hella is another established brand known for quality electronic components.
- Value-Oriented Brands: Brands like DriveWire, Spectra, and Global Parts offer a more budget-friendly option. While they may not have the same long-standing reputation as premium brands, they can be a good choice for drivers looking for a cost-effective solution, especially if selling the vehicle or on a tight budget.
Pro Tip: It's often a good idea to replace all ignition coils at the same time, especially if your Eclipse has high mileage or if one has failed. Coils tend to have a similar lifespan, so if one goes bad, the others may not be far behind. This can save you from future repairs and ensure balanced engine performance.
Ignition Coil Replacement Cost (2006-2012 Mitsubishi Eclipse)
| Part Type | Estimated Cost (Per Coil) |
|---|---|
| New OEM | $100 - $150 |
| New Aftermarket | $35 - $97 |
| Shop Labor | $75 - $150 |
Note: Labor costs can vary. The V6 engine requires removing the intake manifold to access the rear coils, which significantly increases labor time and cost.
Frequently Asked Questions
How do I know if my ignition coil is bad?
Common symptoms include a flashing or solid check engine light, engine misfires (shaking, sputtering, or jerking), rough idling, reduced power, and worse gas mileage. You may also smell unburnt fuel from the exhaust. An OBD-II scanner can read codes like P0300 (random misfire) or P0301-P0306 (misfire on a specific cylinder) 🎬 Watch: How to diagnose the top 5 causes of misfires to help pinpoint the problem.
Can I replace just one ignition coil?
Yes, you can replace only the failed coil. However, for high-mileage vehicles, it is recommended to replace them as a set. All coils have been subjected to the same amount of wear, so another one could fail soon after. Replacing them all at once ensures reliability.
Is it hard to replace the ignition coils on my Eclipse?
For the 2.4L 4-cylinder engine, it's a very easy job that most DIYers can do in under an hour with basic tools. For the 3.8L V6, the front three coils are easy, but the rear three are located under the intake manifold. Replacing the rear coils is a more difficult job that requires removing the manifold and will take significantly longer.
🎬 Watch: V6 spark plug and coil access walkthroughWhat is the difference between the 4-cylinder and V6 ignition coils?
The 2.4L 4-cylinder and 3.8L V6 engines use the same ignition coil part number. The only difference is the quantity needed: four for the 4-cylinder and six for the V6.
Helpful Videos
Technical Specifications
OEM Part Numbers: MR994643 MR994642 FK0279 MN119739
Coil-on-Plug (Pencil Type), 3-Blade Terminal Connector. Fits both 2.4L I4 and 3.8L V6 engines for the 2006-2012 model years.
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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: