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 MANUALSJEEP2009COMMANDER 4WD V8-4.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIRSPARK PLUG - REMOVAL
2009 Jeep Commander 4WD V8-4.7L
Spark Plug - Removal
2009 Jeep Commander 4WD V8-4.7LSECTION Spark Plug - Removal
4.7L
CAUTION: This engine uses TWO DIFFERENT types of spark plugs. A total of 16 plugs are used. The plugs are mounted in two rows (banks). The upper row (5) is used on the intake valve side of the cylinder head. The lower row (6) is used on the exhaust valve side of the cylinder head. The upper row (5) uses Bosch Nickel Yttrium plugs. The lower row (6) uses Bosch Iridium plugs. DO NOT INTERCHANGE THESE PLUGS.
1. Remove necessary air filter tubing and air intake components at top of engine and at throttle body.
NOTE: To remove the upper row of spark plugs (5), each individual ignition coil (2) must be removed first.
2. Remove the ignition coil(s) Ignition Coil - Removal
3. Prior to removing the spark plug(s), spray compressed air into cylinder head opening. This will help prevent foreign material from entering combustion chamber.
CAUTION: Due to tight clearances between UPPER row of plugs (5) and cylinder head, a conventional deep, thick-wall spark plug socket will not fit. Use a deep, THIN-WALL 5/8" spark plug socket for plug removal and installation.
CAUTION: Do not attempt to clean any of the spark plugs. Replace only.
4. Remove the spark plug(s) and inspect their condition.
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.