Acura TSX Spark Plug Replacement Guide for 2004-2014 Models
Keep your K-series or J-series engine running perfectly with the right spark plugs for your TSX.
- Only use NGK or Denso Iridium spark plugs for best performance and longevity; they are the OEM suppliers.
- Verify the exact part number for your engine, as it differs between the 1st gen (K24A2), 2nd gen 4-cyl (K24Z3), and V6 (J35Z6).
- Replacement is an easy DIY job on 4-cylinder models, requiring only basic tools and less than an hour.
- Buy from a reputable source to avoid counterfeit plugs that can cause premature failure.
Signs of Failing Spark Plugs
Worn spark plugs can cause noticeable problems with your TSX. If you experience any of these symptoms, it might be time for a replacement.
- Rough Idle: Your engine may shake or vibrate more than usual when stopped.
- Engine Misfires: You might feel a hesitation or stumble during acceleration. This can also trigger a flashing Check Engine Light.
- Reduced Fuel Economy: Worn plugs can cause inefficient fuel burn, making you visit the gas station more often. 🎬 Watch: A visual guide to common symptoms of bad spark plugs.
- Poor Acceleration: The car may feel sluggish or less responsive than normal.
- Difficulty Starting: In advanced stages of wear, bad plugs can make it hard to start the engine.
Generation and Engine Differences (2004-2014)
It is critical to buy the correct spark plugs for your specific TSX engine. The 2004-2014 period covers two generations and three different engines.
- 2004-2008 TSX (First Generation): All models use a 2.4L 4-cylinder engine (K24A2). The correct OEM-spec plugs are NGK IZFR6K11 or Denso SKJ20DR-M11. 🎬 See this complete beginner's guide for 2004-2008 spark plug replacement.
- 2009-2014 TSX (Second Generation, 4-Cylinder): These models use an updated 2.4L 4-cylinder engine (K24Z3). They require different plugs: NGK ILZKR7B-11S or Denso SXU22HCR11S.
- 2010-2014 TSX (Second Generation, V6): The optional 3.5L V6 engine (J35Z6) uses NGK ILZKR7B-11 or Denso SXU22HCR11 plugs.
Pro Tip: Always double-check the part number against your vehicle's year and engine type before purchasing. Using the wrong heat range or plug design can harm your engine.
Choosing the Right Aftermarket Spark Plugs
For Honda and Acura vehicles, sticking with the original equipment manufacturer (OEM) brand is the best choice, even when buying from an aftermarket supplier. The consensus among TSX owners is clear: use NGK or Denso.
Brand Quality Tiers
- Tier 1 (Recommended): NGK, Denso
These are the OEM suppliers for Acura. Their Iridium plugs are designed for longevity and optimal performance in your engine. They offer the best combination of performance and durability, often lasting up to 100,000 miles. You cannot go wrong choosing the specific NGK Laser Iridium or Denso Iridium Long-Life plug listed for your engine. - Tier 2 (Use with Caution): Bosch, Autolite
While these brands make quality parts, forum discussions among TSX owners often report less consistent performance compared to NGK and Denso. If you are on a very tight budget, their iridium or platinum options may work, but OEM brands are strongly preferred for reliability. - Tier 3 (Not Recommended): Champion
Owners specifically advise against using Champion plugs in the TSX, citing poor performance that required swapping them out for NGK plugs.
There have been reports of fake NGK and Denso spark plugs sold through online marketplaces. These counterfeit plugs are made from inferior materials and can fail very quickly, causing misfires. To avoid this, purchase from reputable auto parts retailers.
Cost of Replacing Acura TSX Spark Plugs
| Item | Estimated Cost |
|---|---|
| Aftermarket Spark Plugs (NGK/Denso Iridium) | $10 - $28 per plug |
| Aftermarket Spark Plugs (Other Brands) | $5 - $15 per plug |
| Shop Labor (4-Cylinder) | $75 - $150 |
| Shop Labor (V6) | $125 - $250 |
Frequently Asked Questions (FAQ)
How often should I change the spark plugs on my TSX?
Acura's Maintenance Minder system will show a code '4' when it's time for a change. This is typically around 100,000 to 105,000 miles for the original iridium plugs.
Is it difficult to replace the spark plugs myself?
For the 4-cylinder engine, this is a very easy DIY job that takes less than an hour. 🎬 Watch: How to diagnose misfires and replace plugs on 2009-2014 models. It only requires basic hand tools. The V6 engine is slightly more difficult because the three rear spark plugs are harder to access near the firewall.
Do I need to gap the new spark plugs?
No. NGK and Denso iridium plugs come pre-gapped from the factory for your specific vehicle. You should not try to adjust the gap, as the fine iridium tip is fragile and can be easily damaged. It's a good idea to check the gap with a feeler gauge to ensure it wasn't damaged in shipping, but do not adjust it.
Should I use anti-seize on the spark plug threads?
NGK states that their new plugs have a special trivalent plating that acts as its own anti-seize. Applying additional anti-seize can cause you to over-torque the plug, which can damage the threads in the aluminum cylinder head. It is generally recommended to install new NGK plugs dry.
Should I replace the ignition coils at the same time?
It is not required. Unlike spark plugs, ignition coils are not a routine maintenance item. You should only replace an ignition coil if it has failed and is causing a specific misfire code (e.g., P0301, P0302). If your car has high mileage and you want to perform preventative maintenance, replacing them is an option but not a necessity.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12290-R40-A01 12290-R70-A01 9807B-5617W 9807B-5615W 12290-R40-A02 12290-R70-A02
Engine-specific Iridium spark plugs. For the 2.4L (K24A2, 2004-08): NGK IZFR6K11 or Denso SKJ20DR-M11. For the 2.4L (K24Z3, 2009-14): NGK ILZKR7B-11S or Denso SXU22HCR11S. For the 3.5L V6 (J35Z6, 2010-14): NGK 12290-R70-A01 or Denso 12290-R70-A02. All use a 5/8" (16mm) hex socket.
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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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