Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA2009CX-9 FWD V6-3.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIR
2009 Mazda CX-9 FWD V6-3.7L
Spark Plug: Service and Repair
2009 Mazda CX-9 FWD V6-3.7LSECTION Service and Repair
SPARK PLUG REMOVAL/INSTALLATION [MZI-3.7]
CAUTION:
- If a spark plug that is not as specified is installed, engine performance will be deteriorated. Install only the specified spark plug when replacing.
1. Disconnect the negative battery cable.
2. Remove the engine cover.
3. Remove the dynamic chamber. Service and Repair
4. Remove the ignition coils. Service and Repair
5. Remove the spark plugs using a plug-wrench.
CAUTION:
- Apply small amount of the specified dielectric grease to the inside of the ignition coils, then install the ignition coils to the spark plugs.
- Specified grease: Motorcraft XG-3A
6. Install in the reverse order of removal.
Tightening torque
1 9-20 Nm {91-204 kgf-cm, 79-177 in-lbf}
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.