Acura Legend Spark Plug Replacement Guide (1986-1995)
Keep your Legend's V6 engine running smoothly with the right set of new spark plugs.
- Stick with OEM brands NGK or Denso for best performance and reliability.
- Ensure you buy the correct plug type for your generation (G1: 1986-90, G2: 1991-95).
- Be prepared for difficult access to the three rear spark plugs near the firewall.
- Always verify the spark plug gap is correct (1.1mm) and use a torque wrench for installation.
Symptoms of Failing Spark Plugs
Worn-out spark plugs can cause noticeable problems. If you experience any of these symptoms, your plugs might be the culprit.
- Rough Idle: The engine may shake or vibrate more than usual when the car is stopped.
- Engine Misfires: You might feel a hesitation or stumble during acceleration. A flashing check engine light often signals a misfire. 🎬 Watch: A helpful case study on diagnosing Acura V6 misfires.
- Poor Acceleration: The car may feel sluggish and less responsive than it used to be.
- Reduced Fuel Economy: If you're filling up your tank more often, inefficient combustion from bad plugs could be the cause.
- Difficulty Starting: A weak spark can make it harder for the engine to turn over, especially when cold.
Choosing the Right Aftermarket Spark Plugs
For the 1986-1995 Acura Legend, sticking close to the original equipment (OEM) design is the best strategy. Honda/Acura originally used NGK and Denso plugs, and they remain the top recommendation among owners.
Generation-Specific Recommendations
It's critical to buy the correct plugs for your Legend's specific engine, as they differ between the first and second generations.
- First Generation (1986-1990): These models with the C25A and C27A V6 engines typically use NGK BCPR-series plugs, such as BCPR6ES-11.
- Second Generation (1991-1995): These models with the C32A V6 engine use NGK BKR-series plugs, like the standard BKR6ES-11 or the platinum PFR6G-11.
Brand Quality Tiers
Not all spark plugs are created equal. Here’s a breakdown of brands based on their performance in the Acura Legend:
- Tier 1 (OEM-Spec): NGK & Denso. These are the original equipment manufacturers. They offer the best fit, performance, and reliability for your Legend. Whether you choose standard nickel, platinum, or iridium versions, you can't go wrong with these brands.
- Tier 2 (Quality Aftermarket): Bosch & Champion. These brands produce quality plugs that are a good alternative if NGK or Denso are unavailable. Bosch offers various plug types, including platinum and iridium options.
- Tier 3 (Budget): Autolite & other value brands. While functional, these are generally considered a step down from the OEM-spec brands. They may have a shorter service life and are best suited for those on a tight budget.
A Note on Iridium Plugs
While modern iridium plugs from brands like NGK and Denso are compatible and offer a longer service life, your Legend's ignition system was originally designed for standard nickel or platinum plugs. You will not see a significant performance gain, but you may benefit from a longer replacement interval.
Installation Tips & Known Issues
Replacing the spark plugs on a Legend is a manageable DIY job. The front three plugs are easy to access. However, the rear three plugs (closest to the firewall) are more difficult and typically require removing the strut tower bar for clearance. 🎬 Watch: A deep dive into Legend spark plug replacement and testing. No specific recalls or Technical Service Bulletins (TSBs) related to spark plugs exist for this vehicle.
Pro Tip: Torque & Anti-Seize
Always use a torque wrench to tighten spark plugs to the correct specification (around 13 lb-ft for the G2 Legend). This prevents thread damage to the aluminum cylinder heads. Applying a small amount of anti-seize compound to the plug threads can make future removal easier.
| Part Type | Price Range (Set of 6) |
|---|---|
| New OEM (NGK/Denso) | $40 - $130 |
| New Aftermarket | $15 - $128 |
| Shop Labor | $150 - $250 |
Frequently Asked Questions
How often should I change my Legend's spark plugs?
For standard copper/nickel plugs, a good interval is every 30,000 miles. If you install platinum or iridium plugs, you can extend that interval to 60,000 miles or more.
What is the correct spark plug gap for my Acura Legend?
The correct gap is typically 1.1mm (0.043-0.044 inches). Most NGK and Denso plugs with a part number ending in "-11" come pre-gapped to 1.1mm. However, it is always best to verify the gap with a feeler gauge before installation.
Is it difficult to change the spark plugs myself?
It is a feasible DIY project. The front three cylinders are simple. The rear three are more challenging due to tight access. You will need a socket set, a 5/8" (16mm) spark plug socket, and extensions. Allow about 1.5 to 2 hours.
🎬 See this walkthrough on changing coil-over-plug style spark plugs.My mechanic suggested a different brand. Is that okay?
While other brands will work, Acura Legend engines are known to perform best with the OEM-spec NGK or Denso plugs. Using them is the safest bet to avoid potential idle or misfire issues that can sometimes occur with other brands.
Helpful Videos
Technical Specifications
OEM Part Numbers: PFR6G-11 BKR6ES-11 BCPR6ES-11 98079-5614G 98079-5615G PK16PR-L11 PFR5G-11
Hex Size: 16mm (5/8"); Gap: 1.1mm (0.044"); Thread Size: 14mm
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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.
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