Learn how to change spark plugs on Mazda.
Replacing spark plugs on a Mazda engine requires a few basic tools and about two hours of labour.
Replacing the spark plugs on a Mazda requires only a few basic tools and parts.
The following instructions show you how to change spark plugs on a Mazda four-cylinder engine.
This is one of the most common Mazda engines found on Mazda 3, Mazda 5, Mazda 6, CX-5, CX-7.
Park you Mazda on level ground. Allow the engine to cool down.
Pull the hood release and open the hood.
Disconnect the negative battery terminal on your Mazda
Remove the engine cover. Grab the engine cover with both hands and lift it up. In the following Mazda, there are no screws to secure the cover. Only tabs underneath the engine cover.
Unplug the electrical connector from the ignition coil. Press on the small tab then pull. Do this for all four coils.
Remove the 10mm bolts that secure the coil in place. Pull the coils out.
Use the spark plug socket, extension and ratched to remove the spark plugs from your Mazda.
Use a magnetic pickup tool to pull out the spark plugs.
Install new spark plugs on your Mazda. Ideally, you want to torque the spark plugs to spec (10-15 lb.ft.).
If no torque wrench is available, tighten the spark plug finger-tight until it reaches the cylinder head.
Next, torque to specification.
Reinstall coils and connect the electrical connectors.
Replace the engine cover.
According to multiple Mazda owner's manuals, the recommended interval to change spark plugs on a Mazda is every 75,000 miles.
If you install copper spark plugs on your Mazda you will need to replace them every 30,000 miles (in average) regardless of what the manual says.
Tighten the spark plug to:
Mazda factory spark plug gap is typically in the .045 to .057 range.
Iridium spark plugs such as Denso Iridiums for Mazda come pre-gapped at 0.044 and should not be changed.
NGK Spark Plugs for Mazda come pre-gapped at 0.054. Do not gap iridium spark plugs.
Most Mazda models including Mazda 3, 5, 6, CX-5, CX-7, CX-9 require that spark plugs be replaced every 75,000 miles.