Acura RL Ignition Coil Replacement Guide for 2005-2012 Models
Fix engine misfires and restore your RL's performance by choosing the right replacement ignition coils.
- For maximum reliability, choose OEM (Hitachi) or premium aftermarket brands like NGK and Denso.
- It is strongly recommended to replace all six ignition coils and spark plugs at the same time.
- A flashing check engine light indicates a severe misfire; pull over and shut off the engine as soon as it is safe to do so to prevent catalytic converter damage.
- This is a very straightforward DIY repair that requires only basic tools and can be done in under an hour.
Signs of a Failing Ignition Coil in Your RL
When an ignition coil starts to fail on your Acura RL, the signs are usually hard to ignore. Because each cylinder has its own coil, a single failure can disrupt the engine's smooth operation. Look out for these common symptoms:
- Check Engine Light: This is often the first warning. The light may be steady or, in the case of a severe misfire, it might flash. A flashing light is a critical warning to stop driving to prevent catalytic converter damage.
- Engine Misfires: The engine may shake, sputter, or vibrate, especially when idling or under load. This is the most common symptom of a bad coil.
- Reduced Power and Poor Acceleration: Your RL may feel sluggish and slow to respond when you press the gas pedal.
- Rough Idle: Instead of a smooth purr at a stoplight, the engine may idle roughly and sound like it's struggling.
- Worse Fuel Economy: When a cylinder isn't firing correctly, the engine becomes less efficient, causing you to use more gas.
- Gasoline Smell: A failing coil can lead to unburned fuel passing into the exhaust system, which you might notice as a gas smell.
Choosing the Right Aftermarket Ignition Coil
Not all aftermarket coils are created equal. For a premium vehicle like the Acura RL, choosing a quality part is key to maintaining its performance and reliability. Here’s how the available brands generally stack up based on owner feedback and OEM status.
Tier 1: OEM & Premium Aftermarket
These brands are either the original equipment manufacturer (OEM) or are widely regarded as being equivalent in quality and reliability. They are the safest bet for a long-lasting repair.
- Hitachi: Hitachi is the original equipment manufacturer for Honda and Acura ignition coils. Choosing Hitachi is the closest you can get to buying the part from an Acura dealer.
- NGK: A top-tier Japanese brand known for ignition components. Forum and Reddit users consistently recommend NGK as a reliable, high-quality alternative to OEM.
- Delphi: A major OEM supplier for many car brands, Delphi has a strong reputation for quality electronics and ignition parts.
Pro Tip: For the best results, stick with Hitachi, NGK, or Denso. Acura owners almost universally agree that using cheap, unproven coils often leads to premature failure and having to do the job again.
Tier 2: Reputable Aftermarket Brands
These brands are well-known in the aftermarket and offer a good balance of price and quality. They are a solid choice for a daily driver.
- Standard Ignition (Standard Motor Products): A long-standing brand that produces a wide range of quality replacement parts.
- Spectra: Known for fuel and engine management components, Spectra offers a reliable mid-range option.
- Walker Products: A trusted name in engine management and emission control parts.
Tier 3: Economy Brands
These brands focus on providing the lowest price point. While they will get your car running, their long-term durability may not match that of premium brands.
- DriveWire
- Global Parts
- True Tech
- Skyward
Common Mistake: A misfire isn't always a bad coil. A worn-out spark plug can cause identical symptoms. It is highly recommended to replace all six spark plugs (with NGK Iridium plugs) whenever you replace the ignition coils to ensure a complete and lasting repair.
Known Issues, Recalls, and TSBs
Searches of the National Highway Traffic Safety Administration (NHTSA) database and technical service bulletins (TSBs) show no specific recalls or service bulletins for ignition coil failure on the 2005-2012 Acura RL. All major recalls for this vehicle pertain to airbags and other components. However, some owners in forums have reported a rare issue where a coil can overheat and melt into the spark plug tube, making removal extremely difficult.
Cost of Replacing Acura RL Ignition Coils (2005-2012)
| Part Type | Estimated Cost (Per Coil) |
|---|---|
| New OEM (Dealer) | $90 - $130 |
| New Aftermarket (Premium) | $60 - $92 |
| New Aftermarket (Economy) | $30 - $55 |
| Shop Labor (All 6 Coils) | $75 - $150 |
Frequently Asked Questions
Should I replace all six ignition coils at once?
Yes, it is highly recommended. Ignition coils are subjected to the same heat and wear over time. If one has failed, the others are likely nearing the end of their service life. Replacing them all at once saves you from future repeat repairs and ensures balanced engine performance.
Is replacing the ignition coils a DIY job?
Absolutely. The ignition coils on the Acura RL's V6 engine are easily accessible on top of the valve covers. The job requires only basic hand tools (a ratchet with an 8mm or 10mm socket) and can typically be completed in under an hour for all six.
What happens if I don't replace a bad ignition coil?
Continuing to drive with a bad coil will cause a persistent misfire, leading to a rough ride, poor fuel economy, and failed emissions tests. More seriously, it allows unburned fuel to enter the exhaust, which can overheat and destroy your expensive catalytic converters, a much costlier repair.
Do I need to replace the spark plugs with the coils?
Yes. Worn spark plugs can put extra strain on the ignition coils, potentially causing them to fail prematurely. Since you already have the coils out, replacing the spark plugs at the same time is a smart and cost-effective measure.
Helpful Videos
Technical Specifications
OEM Part Numbers: 30520-R70-A01 30520-R70-S01 30520-RCA-A02
Coil-on-Plug (COP) design, one per cylinder. Requires a single bolt for mounting.
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.
- Acura RL:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Signs of a Failing Ignition Coil in Your RL
- Choosing the Right Aftermarket Ignition Coil
- Tier 1: OEM & Premium Aftermarket
- Tier 2: Reputable Aftermarket Brands
- Tier 3: Economy Brands
- Known Issues, Recalls, and TSBs
- Cost of Replacing Acura RL Ignition Coils (2005-2012)
- Frequently Asked Questions
- 🎟️ Get 5% Off