Choosing the Right Spark Plugs for Your 1996-2012 Acura RL
Keep your Acura RL's V6 engine running smoothly with the correct spark plugs for its specific needs.
- Stick with OEM brands NGK or Denso for the best reliability and performance.
- Ensure you buy the correct plug type (Platinum or Iridium) for your RL's generation (1996-2004 vs. 2005-2012).
- Replacing all six plugs at once is highly recommended for balanced performance.
- While DIY replacement is feasible, the rear plugs require extensions and patience to access.
Symptoms of Failing Spark Plugs
Worn-out spark plugs can cause several noticeable issues in your Acura RL. You might experience a rough idle, where the engine shakes or vibrates more than usual when stopped. Another common symptom is engine hesitation or stumbling during acceleration. A significant drop in fuel economy or a general lack of power can also point to failing plugs. If the problem is severe, the "Check Engine" light may illuminate, often with misfire codes like P0300 through P0306.
Choosing the Right Aftermarket Spark Plugs
For Acura vehicles, the original equipment (OEM) spark plugs are almost always manufactured by NGK or Denso. These brands are the gold standard for the RL and are highly recommended by owners and mechanics alike. When shopping for aftermarket plugs, choosing the NGK or Denso equivalent is the safest and most reliable option.
Aftermarket Brand Tiers for Acura RL
| Tier | Brands | Notes |
|---|---|---|
| Tier 1: OEM-Equivalent | NGK, Denso | These are the original suppliers for Acura. Aftermarket plugs from these brands often match the dealer parts in quality and performance, ensuring your engine runs as designed. They are the most recommended choice for both first (1996-2004) and second (2005-2012) generation RL models. |
| Tier 2: Reputable Aftermarket | Bosch | Bosch produces high-quality iridium plugs that are a viable alternative. While not the OEM supplier, they are a well-respected brand in the industry. |
| Tier 3: Budget Options | Autolite, Champion | These brands offer more affordable spark plugs, including copper and platinum options. They may not offer the same longevity or precise performance as iridium plugs from NGK or Denso, especially for the later model RLs that came with long-life iridium plugs from the factory. |
| Not Recommended | Motorcraft, ACDelco | While these are quality brands, they are the OEM suppliers for Ford and General Motors, respectively. It is generally best to stick with brands that specialize in or are OEM for Japanese vehicles. |
Generation-Specific Spark Plug Information
It's crucial to buy plugs that are correct for your specific year model, as the two generations of Acura RL use different engines and plugs.
- 1996-2004 Acura RL (First Generation): These models with the 3.5L C-series engine typically use NGK Laser Platinum (PFR5L-11) or Denso Double Platinum (PK16PR-L11) plugs.
- 2005-2012 Acura RL (Second Generation): These models with the J-series V6 (3.5L or 3.7L) came from the factory with long-life Iridium plugs. The recommended OEM parts are NGK Laser Iridium (IZFR6K11) or Denso Iridium (SKJ20DR-M11). For 2009-2012 models with the 3.7L engine, the NGK part number is often ILZKR7B-11S.
Pro Tip: Installation Notes
Replacing spark plugs on the RL's V6 is a manageable DIY job. The front three plugs are easily accessible. The rear three are more challenging due to tight space near the firewall, but can be reached with a few socket extensions. Always use a torque wrench to tighten the new plugs to the manufacturer's specification (typically around 13 ft-lbs) to avoid damaging the engine's cylinder head. While some mechanics use anti-seize on the threads, NGK and Denso often advise against it on their coated plugs, as it can lead to over-torquing. Check the plug manufacturer's recommendation.
Frequently Asked Questions (FAQ)
Do I need to replace all six spark plugs at once?
Yes. Spark plugs wear at a similar rate. Replacing all of them at the same time ensures balanced engine performance and saves you from having to do the job again in the near future when another old plug fails.
What's the difference between Platinum and Iridium spark plugs?
Iridium is a harder, more durable material than platinum. Iridium spark plugs have a finer center electrode, which allows for a more focused and powerful spark. They also last significantly longer—often over 100,000 miles—compared to platinum plugs. Second-generation (2005-2012) RLs came with iridium plugs from the factory and should be replaced with the same type.
Are there any recalls for Acura RL spark plugs?
No, there are no specific recalls issued by the NHTSA for spark plugs on the 1996-2012 Acura RL. However, misfires caused by faulty plugs can be related to other issues, so it's important to diagnose the problem correctly.
Should I also replace the ignition coils with the spark plugs?
It is not always necessary, but it is a good time for inspection. While the plugs are out, inspect the ignition coil boots for any cracks, swelling, or oil contamination. If the engine has been misfiring, it's possible a coil has failed. A common diagnostic technique is to swap the coil from a misfiring cylinder to a good one and see if the misfire code follows the coil. If you have high mileage and are replacing the plugs as preventative maintenance, you can often reuse the original coils if they are in good condition.
Technical Specifications
OEM Part Numbers: 98079-5517S 98079-5515H 9807B-5617W 12290-R40-A01 12290-R40-A02
Vehicle requires a set of six spark plugs. First generation (1996-2004) models typically use platinum plugs, while second generation (2005-2012) models use long-life iridium plugs. The hex size is typically 5/8" (16mm).
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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.
- Acura RL: