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 MANUALSCHRYSLER2003300M V6-3.5L VIN MREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIR
2003 Chrysler 300M V6-3.5L VIN M
Spark Plug: Service and Repair
2003 Chrysler 300M V6-3.5L VIN MSECTION Service and Repair
REMOVAL
Always remove the ignition coil assembly by grasping at the spark plug boot, turning the assembly 1/2 turn and pulling straight back in a steady motion.
1. Prior to removing the spark plug, spray compressed air around the coil area and spark plug.
2. Remove electrical connector from ignition coil. On 3.5L engines, it is necessary to loosen the screws by alternating back and forth. Do not lose the spacers under the coil when loosening the screws.
3. Remove 2 fasteners from ignition coil.
4. Remove ignition coil assembly.
5. Remove the spark plug using a quality socket with a rubber or foam insert.
6. Inspect the spark plug condition.
INSTALLATION
1. To avoid cross threading, start the spark plug into the cylinder head by hand.
2. Tighten spark plugs.
2.7L engine 17.6 Nm (13 ft. lbs.)
3.5L engine 28 Nm (20 ft. lbs.)
3. Install ignition coil assembly onto spark plug.
4. Install coil screws and tighten.
2.7L engine 6.2 Nm (55 in. lbs.)
3.5L engine 6.7 Nm (60 in. lbs.)
5. Connect the electrical connector.
Always remove the ignition coil assembly by grasping at the spark plug boot, turning the assembly 1/2 turn and pulling straight back in a steady motion.
1. Prior to removing the spark plug, spray compressed air around the coil area and spark plug.
2. Remove electrical connector from ignition coil. On 3.5L engines, it is necessary to loosen the screws by alternating back and forth. Do not lose the spacers under the coil when loosening the screws.
3. Remove 2 fasteners from ignition coil.
4. Remove ignition coil assembly.
5. Remove the spark plug using a quality socket with a rubber or foam insert.
6. Inspect the spark plug condition.
INSTALLATION
1. To avoid cross threading, start the spark plug into the cylinder head by hand.
2. Tighten spark plugs.
2.7L engine 17.6 Nm (13 ft. lbs.)
3.5L engine 28 Nm (20 ft. lbs.)
3. Install ignition coil assembly onto spark plug.
4. Install coil screws and tighten.
2.7L engine 6.2 Nm (55 in. lbs.)
3.5L engine 6.7 Nm (60 in. lbs.)
5. Connect the electrical connector.
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.