How often should I replace spark plugs on my Acura?

For most modern Acura models, spark plugs are designed to last a long time—often around 100,000 miles under normal driving. If your car uses traditional copper plugs, or you frequently drive under harsh conditions, the interval can be shorter. Always verify the exact recommendation in your owner's manual for your engine and trim level.

What your owner's manual typically recommends

Engine design and plug type vary by model and year. Here is a general guide to replacement intervals you may see in Acura maintenance schedules:

• Iridium or platinum spark plugs in most recent Acura engines: about 100,000 miles under normal driving.


• Copper spark plugs or older Acura engines: typically 30,000–60,000 miles.


• Turbocharged engines or vehicles driven in severe conditions (short trips, heavy towing, extreme temperatures): replacement may be sooner, often around 60,000 miles or less.

Note: Always follow the specific interval listed in your owner's manual or on the maintenance schedule for your exact engine code. Some engines use copper plugs with shorter lifespans, while current Acura vehicles with iridium or platinum plugs commonly specify 100,000 miles under normal driving conditions.

Factors that influence spark plug life

Several factors can shorten or extend plug life, even within the same model year. Consider these common drivers:

• Driving habits: frequent short trips and lots of cold starts wear plugs faster.


• Climate and operating conditions: extreme heat or cold can impact plug life and heat range requirements.


• Fuel quality and engine maintenance: consistent quality fuel and proper ignition system maintenance help plugs last longer.


• Engine tuning and component wear: worn ignition coils, spark plug wires, or other ignition components can shorten plug life.


• Engine type: turbocharged or high-performance engines typically experience more heat and may need earlier replacement.

Understanding these factors helps tailor replacement intervals to your actual use rather than sticking to a calendar alone.

Signs your spark plugs may need replacement

Identifying wear early can prevent performance problems and protect engine health. Look for these indicators:

• Rough idle or misfires, especially at low speeds or when the engine is cold.


• Poor acceleration or sluggish response from the throttle.


• Increased or erratic engine RPMs and rough running.


• Reduced fuel economy or higher fuel consumption.


• Check Engine Light or diagnostic trouble codes related to misfire (P0300 series).

If you notice any of these symptoms, have the ignition system checked promptly. Worn plugs can lead to further engine issues if ignored.

What to expect during replacement

Replacing spark plugs on an Acura is generally straightforward, but modern engines with coil-on-plug systems require careful handling. A typical replacement process includes inspecting and potentially replacing ignition coils or coil packs if they show wear, removing the intake components as needed, installing new plugs with the correct torque, and resetting any affected sensors or codes. Always use the recommended plug type and heat range for your engine and follow the service manual’s torque specifications.

Maintenance tips to maximize spark plug life

Smart maintenance can help you get the most life from your plugs. Here are best practices:

• Use the correct plug type and heat range as specified for your Acura engine.


• Follow the recommended torque when installing new plugs; overtightening can damage threads and cause leaks.


• Inspect ignition coils and wires for wear or damage and replace as needed.


• Keep the air intake and fuel system clean to prevent misfires caused by lean or rich running conditions.


• Schedule plugs replacement at your routine service interval rather than waiting for symptoms to appear.

Sticking with OEM-approved components and maintaining the ignition system helps ensure you reach the manufacturer’s expected plug-life interval.

Model-specific notes about plug choices

Across recent Acura lineups, many engines use iridium or platinum plugs designed for long life, commonly rated at about 100,000 miles under normal driving. Older or high-mileage models may use copper plugs with shorter replacement windows. When in doubt, refer to your specific model year and engine code in the owner's manual or consult a dealer or trusted mechanic.

Summary

In most newer Acura models, expect spark plugs to last around 100,000 miles under normal driving with iridium or platinum plugs, while copper plugs on older or non-standard engines may require replacement closer to 30,000–60,000 miles. Severe driving conditions, turbocharged engines, or signs of wear can shorten this interval. Always verify the exact recommendation in the owner’s manual for your vehicle, watch for symptoms of wear, and maintain the ignition system to maximize plug life.

How long do Acura spark plugs last?

between 60,000 and 100,000 miles
So, how long do Acura spark plugs last? In most cases, between 60,000 and 100,000 miles, depending on the type of plug and your driving habits. But even if you're not close to that mileage, don't ignore the signs of failing spark plugs.

Is Acura reliable after 100K miles?

Yes, Acuras are generally very reliable after 100k miles, especially with consistent maintenance, as they are built with quality engineering from their Honda roots. Key to this reliability is following the recommended maintenance schedule, which includes performing major services like transmission fluid changes and, for models with a timing belt, replacing it around the 100k mark. 
Key factors for long-term reliability

• Follow the maintenance schedule: Regular oil changes, fluid replacements, and other services are crucial for longevity. 
• Pay attention to major service intervals: At around 100,000 miles, certain components, like the timing belt in older models, need to be replaced. 
• Transmission fluid is critical: Changing the transmission fluid at recommended intervals is one of the most important aspects of keeping the car running smoothly long-term. 
• Consider the engine: While many Acura engines are very reliable, some J-series engines have a history of oil consumption issues, especially older ones. 
• Potential for issues: As with any car, some issues can arise after 100k miles, such as air conditioning system problems or oil consumption, so it's wise to factor in potential repair costs. 

What drivers say

• Many owners report driving their Acuras for hundreds of thousands of miles with minimal issues if proper maintenance was performed.
• Owners of older models like the TL and MDX often report that the engines remained in good condition even after the transmission began to show wear. 

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

The cost to replace the spark plugs on an Acura MDX typically ranges from $465 to over $970, depending on the model year. The lower end of the estimate is around $465 for newer models, while the higher end, closer to $970, is for older models like a 2013. The total cost is a combination of parts (spark plugs) and labor, with labor being the largest portion at a repair shop. 
Estimated costs by model year

• 2020 Acura MDX: Estimated cost of $464.59 (shop/dealer prices range from $546.07 to $786.40).
• 2013 Acura MDX: Estimated cost of $558.32 (shop/dealer prices range from $665.45 to $972.67).
• 2003 Acura MDX: Estimated cost of $529.15 (shop/dealer prices range from $628.19 to $918.00). 

Factors that influence cost

• Labor: This is a significant part of the total cost and is higher at a repair shop than if you perform the service yourself. 
• Parts: The price of the spark plugs themselves can vary depending on the brand and type (e.g., iridium, platinum). 
• Model Year: Older vehicles often have higher repair costs due to factors like more difficult access to parts and potentially different labor times. 

What are signs of bad spark plugs?

Signs of bad spark plugs include rough idling, difficulty starting the engine, decreased fuel economy, and poor acceleration. You may also experience engine misfires, which can cause the vehicle to shake or hesitate, and the check engine light to illuminate. 
Performance issues

• Rough idling: The engine shakes or sputters when the car is stopped. 
• Engine misfires: The engine skips a beat, which can be felt as a hesitation or vibration. 
• Poor acceleration: The vehicle feels sluggish when you press the gas pedal. 
• Engine knocking: Unusual knocking or pinging sounds may come from the engine. 

Fuel and starting problems

• Poor fuel economy: You'll notice you need to fill up the gas tank more often. 
• Difficulty starting: The engine may crank for a longer time before starting. 

Visual and warning signs

• Check engine light: The light may come on, especially if the misfires are frequent. 
• Black exhaust smoke: The tailpipe might emit black smoke. 
• Visual inspection: When removed, a bad spark plug may show a worn electrode, a cracked insulator, or deposits of oil or fuel.