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.
2008 Jeep Commander 4WD V6-3.7LFACTORY OEM SERVICE PROCEDURE
Spark Plug - Installation
INSTALLATION - EXCEPT 4.7L V-8
CAUTION: Never use a motorized wire wheel brush to clean spark plugs. Metallic deposits will remain on spark plug insulator and will cause plug misfire.
CAUTION: Do not attempt to clean any of the spark plugs. Replace only.
1. To aid in coil installation, apply silicone based grease such as Mopar(R) Dielectric Grease # J8126688 into spark plug end of ignition coil rubber boots. Also apply this grease to the tops of spark plugs.
2. Check and adjust spark plug gap with a gap gauging tool (1). Refer to the Spark Plug Specifications for plug gap.
3. Start the spark plug into the cylinder head by hand to avoid cross threading. Special care should be taken when installing spark plugs into the cylinder head spark plug wells. Be sure the plugs do not drop into the plug wells as electrodes can be damaged.
Always tighten spark plugs to the specified torque. Certain engines use torque sensitive spark plugs. It is a good practice to always tighten spark plugs to a specific torque. Over tightening can cause distortion resulting in a change in the spark plug gap, or a cracked porcelain insulator.
4. Install ignition coil(s).
5. Install necessary air filter tubing and air intake components to top of engine and to throttle body.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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