Spark plugs should generally be replaced based on the type of plug and the vehicle manufacturer's recommendation. Here are key points on when to replace spark plugs:
- Replacement intervals vary by spark plug type:
- Copper spark plugs typically last around 25,000-30,000 miles.
- Platinum and iridium spark plugs can last from 60,000 up to 100,000 miles or more.
- It's best to check the owner's manual for your specific vehicle's recommended interval, as it can vary by make and model. For example, some Toyota models recommend replacement at 60,000 miles, while others may go as far as 120,000 miles before replacement.
- Signs that spark plugs might need replacement include:
- Reduced engine acceleration and performance.
- Rough idling or engine misfires.
- Poor fuel economy.
- Difficulty starting the vehicle.
- Illumination of the Check Engine light.
- Even if the vehicle seems to be running fine, replacing spark plugs as part of regular maintenance before they fail can help avoid engine misfires and potential damage to other components like the catalytic converter.
In summary, spark plugs should usually be replaced between 30,000 and 100,000 miles, depending on the type and your vehicle's recommendations. Keeping up with this maintenance helps maintain engine performance and fuel efficiency.
