When to change spark plugs on acura tsx?

In most Acura TSX models, spark plugs with long-life iridium or platinum cores are typically due around 105,000 miles, while copper plugs usually require replacement around 60,000 miles. Always check your specific year and engine code in the owner’s manual for the exact interval.

This article outlines the official guidance, practical considerations, signs of wear, and a step-by-step guide for replacing spark plugs on the Acura TSX. It also notes how driving conditions and plug type can influence maintenance timing.

Official replacement intervals by plug type

Here are the typical replacement intervals you’ll encounter, depending on the spark plug material used in your TSX.

• Iridium or platinum plugs: about 105,000 miles (approximately 169,000 km) — commonly listed as the long-life interval for many Acura/Honda engines.


• Copper core plugs: around 60,000 miles (approximately 97,000 km) — shorter life due to copper electrode wear.


• Other long-life variants (special OEM or aftermarket alloys): commonly in the 100,000–120,000 mile range; always verify the exact plug type and engine revision for your car.

In practice, follow the manufacturer’s recommendation for the specific plug type you have installed and refer to the owner’s manual for your exact year and engine code. This helps ensure optimal performance and reduces the risk of misfires or reduced fuel efficiency.

Signs your TSX needs spark plug replacement

Even if you’re near or just past a mileage milestone, certain symptoms can indicate plugs should be replaced sooner rather than later.

• Rough idle or engine misfires, especially at low speed or during acceleration


• Decreased fuel economy or reduced engine performance


• Difficulty starting or extended cranking before the engine catches


• Illuminated check engine light with misfire codes (for example, P0300s)


• Discolored or worn-looking plugs when inspected and an increased electrode gap

If you notice any of these signs, schedule a plug inspection and replacement as needed, even if you haven’t reached the mileage interval.

DIY replacement: what to expect

If you’re comfortable performing basic maintenance, replacing spark plugs on the TSX is a manageable job for many home enthusiasts. Gather the right tools and exercise careful technique to avoid damaging threads or coil components.

1. Prepare the vehicle: park on a level surface, engage the parking brake, and disconnect the negative battery terminal to prevent accidental starting.


2. Access the plugs: remove the engine cover if equipped, then locate the coil-on-plug assemblies above each cylinder.


3. Remove coils: unplug the ignition coil connectors, unbolt or unclip the coils, and lift them away from the spark plugs.


4. Clean the wells: carefully clean around each plug well to prevent debris from falling into the cylinder during removal.


5. Remove old plugs: use a spark plug socket with a 3-inch extension to reach and loosen the plugs; remove them without forcing.


6. Install new plugs: check if the plugs are pre-gapped; most modern iridium/platinum plugs come pre-gapped and should not be gapped. Hand-tighten first, then torque to the factory spec (typically around 13–15 ft-lbs / 18–20 Nm; verify exact spec in your manual).


7. Reassemble: reinstall the coils, reconnect electrical connectors, reinstall the engine cover, and reconnect the battery.


8. Test: start the engine, listen for smooth running, and take a short test drive to confirm no misfires or rough running. Clear any codes if needed and re-check after a short period of driving.

Following these steps with attention to torque and plug type helps ensure a proper seal and reliable operation. If you encounter cross-threading, stripped threads, or persistent misfires, stop and consult a professional.

TSX-specific considerations

The Acura TSX uses a coil-on-plug ignition arrangement in most years. If you’re replacing plugs yourself, consider inspecting or replacing worn ignition coils at the same time if you notice misfires or rough running. Use OEM or OEM-equivalent plugs recommended for your exact engine code (K24 family in most 4-door TSX models) and avoid gaps or adapters that aren’t specified by Honda/Acura. Always confirm torque specs and gap requirements in the service manual for your exact model year.

When to seek professional service

Some maintenance tasks are best left to a technician, particularly if you encounter stubborn corrosion, stripped threads, or repeated misfires after plug replacement. If you’re unsure about your engine’s exact spark plug type, the correct torque value, or the necessary coil work, a certified technician can ensure proper installation and proper ignition timing.

Summary

The Acura TSX generally requires spark plug replacement around 105,000 miles for iridium/platinum long-life plugs and about 60,000 miles for copper plugs, though exact intervals depend on the plug type and engine revision. Monitor for signs of wear such as rough idle, poor fuel economy, or hard starting, and consult the owner’s manual for your specific year and engine code. For a DIY approach, follow careful steps: disconnect the battery, access the coils, replace each plug with proper torque, and test drive. When in doubt, or if you encounter mechanical issues, seek professional service to maintain performance and reliability.

Do I really need to change my spark plugs at 100,000 miles?

Yes, replacing spark plugs at 100,000 miles is a common and often necessary maintenance task, as many modern vehicles have spark plugs rated to last that long. However, the exact interval depends on your vehicle's make, model, and the type of spark plug installed, so you should always check your owner's manual for the manufacturer's specific recommendation. 
This video explains when to change spark plugs and what happens if you don't: 1mHonest Mechanic ColoradoYouTube · Dec 24, 2023
Why it's important

• Engine performance: Spark plugs that are past their prime can cause rough idling, poor acceleration, and decreased fuel efficiency. 
• Preventing damage: Over time, worn-out plugs can put extra stress on other components, like ignition coils, and may seize in the engine block, making them harder to remove later. 
• Preventative maintenance: Replacing spark plugs is a form of preventative maintenance that can prevent more costly repairs down the line. 

This video explains why it's important to change spark plugs at 100k miles: 52sWhite One Auto, LLCYouTube · May 19, 2021
What to consider

• Owner's manual: Your vehicle's owner's manual is the most reliable source for the correct replacement interval and recommended plug type. 
• Spark plug type: The lifespan of spark plugs varies by material. Iridium plugs are often rated for 100,000 miles or more, while other types like copper or platinum have shorter lifespans. 
• Driving conditions: Severe driving conditions can shorten the life of spark plugs, so your interval may be shorter than recommended if you frequently tow, drive in extreme temperatures, or frequently start and stop. 

How much does it cost to replace spark plugs in Acura TSX?

The cost to replace the spark plugs on an Acura TSX typically ranges from $450 to $700, depending on the specific model year. This includes parts and labor, with the price varying based on the parts needed and whether you go to a dealer or an independent shop. You can expect to pay more for the newer models compared to the older ones. 
You can watch this video to learn about the cost of replacing spark plugs: 34sTalkingTechTrendsYouTube · Mar 12, 2025

• Average cost: The national average for a spark plug replacement on an Acura TSX is roughly $450 to $700. 
• Parts and labor: The total cost includes both the new spark plugs and the labor to have them installed. 
• Model year variation: Older models generally have lower replacement costs than newer ones, so it's important to get a quote based on your specific vehicle's year. 
• DIY vs. professional: If you are a skilled DIY mechanic, you can save on labor costs by replacing the spark plugs yourself, which will bring the cost down to just the price of the parts. 

How do I know when it's time to change my spark plugs?

Signs you need new spark plugs include rough idling, poor acceleration, and difficulty starting the engine. Other indicators are a drop in fuel efficiency, engine misfires, and the "check engine" light coming on. You may also hear unusual engine knocking or pinging sounds. 
This video explains the signs of bad spark plugs: 44shaile car care YouTube · Apr 23, 2023
Engine performance issues

• Rough idling: The engine shakes or vibrates when it's supposed to be running smoothly at a stop. 
• Sluggish acceleration: The car feels slow or hesitant when you press the gas pedal. 
• Engine misfires: You may feel the engine sputter or hesitate, as if it's momentarily losing power. 
• Engine knocking: Unusual knocking or pinging sounds can come from the engine. 

Starting and fuel economy problems 

• Difficulty starting: The engine cranks longer than usual before starting, or it may be a "hard start".
• Decreased fuel efficiency: You notice you're getting fewer miles per gallon, as the engine works harder to ignite the fuel. 

Warning lights and other signs 

• Check engine light: This dashboard light can turn on for many reasons, including failing spark plugs. 
• Flashing check engine light: A flashing light often indicates a more severe misfire and should be addressed immediately. 

How often should I change the spark plugs on my Acura?

every 30,000 miles
Experts generally recommend replacing spark plugs every 30,000 miles.