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 OVERLAND, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 102 (IGNITION CONTROL (SERVICE INFORMATION))SPARK PLUGINSTALLATION3.7L
2009 Jeep Commander Overland, RWD
Spark Plug: Installation: 3.7L
2009 Jeep Commander Overland, RWDSECTION 3.7L
WARNING: This page is about a different car, the 2009 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
- Check and adjust the spark plug gap with a gap gauging tool (1). See Specifications
- Start the spark plug into the cylinder head by hand to avoid cross threading.
- Tighten the spark plugs to 27 N.m (20 ft. lbs.).
- Before installing the ignition coil (1), check the condition of the coil O-ring and replace as necessary. Apply silicone based grease such as Mopar® Dielectric Grease into the spark plug end of the rubber boot, coil O-rings and to the top of spark plugs.
- Install the ignition coil (1). See Installation
- Install all the necessary air filter tubing and air intake components at the top of the engine and at the throttle body.
RENDER: 1.0x
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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.