The Subaru WRX is a high-performance vehicle known for its exceptional handling and power. However, to maintain its performance and longevity, regular maintenance is crucial. One of the most critical components that require attention is the spark plugs. Spark plugs play a vital role in the engine’s combustion process, and worn-out or fouled spark plugs can lead to poor engine performance, decreased fuel efficiency, and even engine damage. Changing the spark plugs on your WRX is a relatively simple process that can be done at home with the right tools and knowledge.
Preparation and Tools Needed
Before starting the process, make sure you have the necessary tools and preparation. The following tools are required:
| Spark plug socket (14mm) | Spark plug gap gauge | Ratchet and extension | Torx screwdriver (T30) |
| Compressed air | Soft cloth or brush | Spark plug wire puller (optional) | New spark plugs (correct type and gap) |
Make sure you have a clean and well-lit workspace, and ensure the vehicle is on level ground. Disconnect the negative battery cable to prevent any accidental starts or electrical shocks.
Locating the Spark Plugs
The spark plugs on your WRX are located on the side of the engine, near the cylinder head. You’ll need to remove the engine cover to access them. Follow these steps:
- Remove the engine cover by unscrewing the screws (T30) and gently lifting it off.
- Locate the spark plug wires, which are attached to the spark plugs. Identify the spark plug wires by their color-coded labels.
- Use a spark plug wire puller to remove the spark plug wires from the spark plugs, if necessary.
Removing the Spark Plugs
Use a spark plug socket to remove the spark plugs. Make sure the socket is securely seated on the spark plug before turning it counterclockwise. Apply gentle pressure and turn the socket until the spark plug is removed.
| Spark Plug Socket (14mm) | Spark Plug |
Be careful not to touch any of the spark plug components, as the oils from your skin can cause corrosion. If you touch any of the components, use a soft cloth or brush to wipe them clean. (See Also: How to Read Bosch Spark Plug Numbers? Decode Your Engine’s Secrets)
Inspecting and Cleaning the Spark Plugs
Inspect the spark plugs for any signs of wear, fouling, or corrosion. Use a spark plug gap gauge to check the gap setting. If the gap is incorrect or the spark plug is fouled, replace it with a new one.
| Spark Plug Gap Gauge | Spark Plug |
Use compressed air to clean the spark plug wells and surrounding areas. This will help remove any debris or dirt that may be affecting the spark plug’s performance.
Installing the New Spark Plugs
Take a new spark plug and insert it into the spark plug socket. Make sure it’s securely seated before turning it clockwise. Apply gentle pressure and turn the socket until the spark plug is tightened to the recommended torque specification.
| Spark Plug Socket (14mm) | New Spark Plug |
Repeat the process for each spark plug, making sure to install them in the correct order and with the correct gap setting.
Reassembling the Engine Cover
Once all the spark plugs are installed, reassemble the engine cover by screwing it back on and tightening the screws (T30) in a star pattern. (See Also: How to Remove Spark Plug Socket from Engine? A Step-by-Step Guide)
Starting the Engine and Checking the Spark Plugs
Start the engine and let it run for a few minutes to ensure the spark plugs are functioning properly. Check the spark plugs again for any signs of fouling or corrosion. If everything seems normal, you can consider the job complete.
Recap and Key Points
Changing the spark plugs on your WRX is a relatively simple process that requires the right tools and knowledge. Here are the key points to remember:
- Disconnect the negative battery cable before starting the process.
- Use a spark plug socket to remove the spark plugs.
- Inspect and clean the spark plugs before installing new ones.
- Install the new spark plugs in the correct order and with the correct gap setting.
- Reassemble the engine cover and start the engine to check the spark plugs.
Frequently Asked Questions
Q: What type of spark plugs should I use for my WRX?
A: The recommended spark plug type for your WRX is the NGK Iridium IX spark plug. However, it’s always best to consult your owner’s manual or the manufacturer’s website for the correct spark plug type and gap setting.
Q: How often should I change my spark plugs?
A: The recommended spark plug replacement interval for your WRX is every 30,000 to 100,000 miles, depending on the driving conditions and spark plug type. However, it’s always best to consult your owner’s manual or the manufacturer’s website for the correct replacement interval.
Q: Can I change the spark plugs myself, or should I take it to a mechanic?
A: Changing the spark plugs on your WRX is a relatively simple process that can be done at home with the right tools and knowledge. However, if you’re not comfortable with the process or don’t have the necessary experience, it’s recommended to take it to a professional mechanic. (See Also: How Do Spark Plugs Know When To Fire? The Ignition Secret)
Q: What are the symptoms of worn-out or fouled spark plugs?
A: Symptoms of worn-out or fouled spark plugs include poor engine performance, decreased fuel efficiency, rough idling, and difficulty starting the engine. If you notice any of these symptoms, it’s recommended to replace the spark plugs as soon as possible.
Q: Can I reuse the spark plug wires and boots?
A: It’s generally not recommended to reuse the spark plug wires and boots, as they may be damaged or worn out. It’s recommended to replace them with new ones to ensure proper spark plug function and to prevent any potential issues.