Most drivers can expect their vehicle’s spark plugs to last between 30,000-90,000 miles, while the lifespan may differ based on make and model. There are some vehicles that only require a change after every 120,000 miles.
What Are Spark Plugs?
Spark plugs ignite a mixture of fuel and air inside the combustion chamber of the engine by creating a quick electrical arc. The pistons are forced to move when this burst of energy occurs.
The crankshaft will transform this movement into rotating wheels, which ultimately propels the vehicle forward. Diesel engines do not have spark plugs, as they rely on greater compression ratios to create the combustion within the vehicle.
How Often Do You Need To Change Spark Plugs?
Most vehicles will require a spark plug change every 30,000-90,000 miles, as mentioned above. Some vehicles, however, can go all the way up to 120,000 miles before a replacement is needed. Reference your owner’s manual for an exact timeline.
Reasons For Bad Spark Plugs
Time is the number one factor when it comes to bad spark plugs. The anti-corrosion coating that is in place to protect this component wears out over time. As it ages, oil, carbon, and dirt can build up on the spark plugs.
A bad fuel filter can also be to blame for failing spark plugs. Grime can ultimately build up on the plugs, erode the insulators, and force an electrical spark in the engine. Misfiring of the engine can impact your vehicle’s overall performance.
Signs You Need To Change Your Spark Plugs
The frequency of this replacement will depend on type and maintenance needs of the vehicle. Automakers generally recommend replacing the plugs every 30,000-40,000 miles. Platinum-tipped plugs only need to be replaced once every 60,000 miles. Iridium plugs should be replaced every 100,000-120,000 miles.
Here are a few signs that you need to replace your spark plugs:
Slow To Accelerate
It’s time to get your spark plugs looked at whenever the vehicle fails to respond to the throttle when accelerating.
Hard To Start Car
If the car fails to start, it’s possible that worn out spark plugs are the root of the cause. Even with a new battery, the engine must work harder when weak plugs are present. The car may not start up at all if the plugs fail to generate enough power to turn the engine over.
Less Efficient
The engine will suck more fuel into the combustion chamber when there is no effective air or fuel mixture combustion. This can result in poor fuel economy.
Engine Misfires
Overworked and worn out spark plugs can cause the engine to misfire at times.
Rough Idling
If the engine emits a knocking or rattling sound when idling or you hear loud noises coming from the engine, it’s time to have your spark plugs inspected.
How Much Does It Cost To Change Spark Plugs?
Spark plug replacement costs can vary widely, ranging all the way from $2-$100. Total costs depend on spark plug types and labor charges. Standard copper spark plugs, for example, cost only $2-$10 each. Iridium plugs cost up to $100 each.
With a wide range of costs for spark plug replacements, labor charges can ultimately make a big difference for the total bill. V6 and V8 engines will cost much more than four-cylinder engines when it comes to labor. Most labor charges will fall between $40-$350 overall.
*These are cost estimates according to JDPower. Contact the team at Heath’s Auto Service in Scottsdale, AZ for more information!
Heath’s Auto Service In Scottsdale, AZ
At Heath’s Auto Service, we offer a comprehensive range of services and repairs to meet all your automotive needs. From routine maintenance like oil changes and tire rotations to more complex repairs involving brake systems, engine diagnostics, and transmission issues, our highly skilled technicians are equipped with the latest tools and technology to ensure your vehicle is serviced to the highest standards. Contact our team today!
