Ensure a strong and reliable spark with our quality replacement spark plugs from Repco
The internal combustion engine hasn't changed much over the last 130 years, and the same principle survives today in generating power for your car. When it comes to providing the best spark to your air-fuel mixture, accept no substitutes when it comes to finding the right spark plug for your vehicle. Repco stocking the best brands from NGK, Bosch, and Champion spark plugs.
How much does it cost to replace spark plugs?
The cost of replacing spark plugs depends on the type of plugs required and the vehicle make and model. Copper spark plugs tend to be the most affordable, ranging from $10 to $20 each. Platinum and iridium spark plugs, which provide longer life and better performance, can cost between $30 and $60 per plug. Labour charges usually range from $100 to $200 for a full replacement, varying with the complexity of engine access. Some engines have plugs that are easy to reach, reducing labour time, while others may require removal of components, increasing costs. Investing in quality plugs suitable for your engine ensures better efficiency and reliability.
How long does it take to change spark plugs?
Changing spark plugs generally takes 30 minutes to 1 hour for a professional mechanic when replacing all plugs. The duration depends on the engine layout and accessibility. Some engines require removal of ignition coils, covers, or other components, which can add to the time. For those performing the replacement themselves, allowing extra time is important to ensure plugs are removed and installed carefully to avoid damage to threads or ignition parts.
What other things should I check when changing spark plugs?
When replacing spark plugs, it’s important to inspect ignition components such as coil packs or spark plug wires for wear, cracks, or corrosion. Faulty ignition parts can cause engine misfires or poor performance. Check that the spark plug holes are clean and free of debris to prevent cross-threading or sealing issues. It’s also useful to review the condition of other engine components like air filters, fuel injectors, and sensors, which can affect combustion quality and overall engine health.
What is the average life span of spark plugs?
The lifespan of spark plugs varies depending on the type and application. Copper plugs typically last 20,000 to 30,000 kilometres, while platinum and iridium plugs can last from 60,000 up to 100,000 kilometres or more. Driving style, engine condition, and maintenance frequency also influence spark plug life. Regular visual inspections and monitoring engine performance can help identify when plugs are worn or fouled, preventing issues such as rough idle, reduced fuel economy, or misfires.
Do I need specialist tools to change spark plugs?
Replacing spark plugs usually requires a spark plug socket with a rubber insert or magnetic feature to hold the plug securely during removal and installation. Ratchets and extension bars may be needed to reach plugs positioned deep within the engine bay. A torque wrench is recommended to tighten plugs to manufacturer’s specifications, preventing over-tightening or damage. In some cases, a feeler gauge is useful for checking or adjusting electrode gaps if the plugs are not pre-gapped. Anti-seize compound can be applied to the plug threads to aid future removal, though not all manufacturers recommend this. Having the correct tools helps ensure a professional and reliable replacement.
How to Change Spark Plugs in Your Vehicle
- Prepare Your Workspace and Vehicle: Park your vehicle on a level surface, turn off the engine, and allow it to cool completely before starting. Gather all necessary supplies and tools, and disconnect the negative battery terminal to prevent any electrical accidents.
- Locate the Spark Plugs: Open the vehicle’s hood and locate the spark plugs. Depending on your engine type, spark plugs may be visible or beneath an engine cover which can be removed by unscrewing bolts or clips.
- Clean the Area Around the Spark Plugs: Use compressed air or a clean brush to remove dirt and debris around each spark plug to prevent contaminants from falling into the combustion chamber when plugs are removed.
- Remove the Spark Plug Wires or Coils: Carefully disconnect the spark plug wires by pulling on the boot, not the wire itself. For coil-on-plug systems, remove the coil pack bolts and gently pull the coil upwards to detach it.
- Unscrew and Remove Old Spark Plugs: Use the spark plug socket attached to a ratchet wrench, possibly with an extension, to loosen and unscrew each spark plug. Turn counterclockwise carefully until the plug is free, then remove it.
- Check and Adjust the Gap on New Spark Plugs: Use the spark plug gap tool to measure and adjust the gap on each new spark plug according to your vehicle’s specifications. Correct gap ensures proper ignition and engine efficiency.
- Apply Lubricants (Optional): Apply a small amount of anti-seize lubricant to the threads of each new spark plug to ease future removal and prevent thread damage. Also, place dielectric grease inside the spark plug boot to protect against moisture and corrosion.
- Install the New Spark Plugs: Carefully thread each new spark plug into its hole by hand to avoid cross-threading. Once hand-tight, use a torque wrench to tighten the plug to the manufacturer’s specified torque value.
- Reinstall Spark Plug Wires or Coils: Reconnect the spark plug wires by firmly pressing the boots onto the spark plugs until you feel them click into place. For coil packs, reinstall them and secure with bolts.
- Reconnect Battery and Test: Reattach the negative battery terminal. Start the engine and listen for smooth operation. If the engine runs roughly, double-check the spark plug wires or coils for proper connection.
- Clean-up and Final Checks: Close the hood and tidy your workspace. Dispose of the old spark plugs responsibly. Monitor your vehicle’s performance over the next few days to ensure optimal engine performance.
