Spark Plug Removal/Installation

NOTE:

CAUTION:

Do not pull on the spark plug wire as it may separate from the spark plug wire connector inside the spark plug wire boot.

Vehicles with 4.0L engine, remove the right front tire and wheel.
Remove the right front fenderwell splash shield.

Fig 1: Removing Right Front Fenderwell Splash Shield
Courtesy of MAZDA MOTORS CORP.
All vehicles, use the Spark Plug Wire Remover to grasp and twist the spark plug wire boot back and forth on the spark plug insulator to release the connector.
Loosen the spark plug.
WARNING:
- Always wear eye protection when using compressed air.
Use compressed air to remove any debris from the spark plug well before removing the spark plugs.
Remove the spark plug.
Inspect the spark plugs.

Fig 2: Spark Plug Inspection
Courtesy of MAZDA MOTORS CORP.
NOTE:
- Platinum-enhanced spark plugs should not require adjustment throughout their service life.
Check and adjust the spark plug gap as necessary.

Fig 3: Checking Spark Plug Gap - 2.3L/3.0L
Courtesy of MAZDA MOTORS CORP.

Fig 4: Checking Spark Plug Gap - 4.0L
Courtesy of MAZDA MOTORS CORP.
NOTE:
- All B-Series with 3.0L or 4.0L engines have factory-installed, color-coded spark plugs. These spark plugs are not interchangeable between the right and left bank.
To install, reverse the removal procedure.
- Use a small, clean tool to coat the entire interior surface of the spark plug wire boot with silicone dielectric compound when installing spark plug wires.
Fig 5: Installing Spark Plug - 2.3L/3.0L
Courtesy of MAZDA MOTORS CORP.

Fig 6: Installing Spark Plug - 4.0L
Courtesy of MAZDA MOTORS CORP.